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Blattman, William R. "Generating CAD Parametric Features Based on Topology Optimization Results." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2367.pdf.
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Staves, Daniel Robert. "Associative CAD References in the Neutral Parametric Canonical Form." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6222.
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Due to the multiplicity of computer-aided engineering applications present in industry today, interoperability between programs has become increasingly important. A survey conducted among top engineering companies found that 82% of respondents reported using 3 or more CAD formats during the design process. A 1999 study by the National Institute for Standards and Technology (NIST) estimated that inadequate interoperability between the OEM and its suppliers cost the US automotive industry over $1 billion per year, with the majority spent fixing data after translations. The Neutral Parametric Canonical Form (NPCF) prototype standard developed by the NSF Center for e-Design, BYU Site offers a solution to the translation problem by storing feature data in a CAD-neutral format to offer higher-fidelity parametric transfer between CAD systems. This research has focused on expanding the definitions of the NPCF to enforce data integrity and to support associativity between features to preserved design intent through the neutralization process. The NPCF data structure schema was defined to support associativity while maintaining data integrity. Neutral definitions of new features was added including multiple types of coordinate systems, planes and axes. Previously defined neutral features were expanded to support new functionality and the software architecture was redefined to support new CAD systems. Complex models have successfully been created and exchanged by multiple people in real-time to validated the approach of preserving associativity and support for a new CAD system, PTC Creo, was added.
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Bouilloux-Lafont, Antoine, and Pozo Rubén Noya. "Development of Acoustic Simulations using Parametric CAD Models in COMSOL." Thesis, Linköpings universitet, Maskinkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157612.
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With constantly changing regulations on emissions, heavy commercial vehicles manufacturershave to adapt for their products to preserve their quality while meetingthese new requirements. Over the past decades, noise emissions have become a greatconcern and new stricter laws demand companies to decrease their vehicle pass-bynoise target values.To address the requirements from different disciplines, Scania follows a simulationdriven design process to develop new concept models EATS. The collaboration amongengineers from different fields is thereby necessary in order to obtain higher performancesilencers. However, the pre-processing step in terms of acoustic simulationsis time-consuming, which can slow the concept development process.In this thesis, a new method was introduced to automate the pre-processing of silenceracoustic models and allow for design optimisation based on acoustic performanceresults. A common Scania product study case was provided to several theseswithin the NXD organisation. The collaboration among the master thesis workersaimed to demonstrate the benefits of KBE and MDO and how they can be integratedwithin Scania’s current concept development and product introduction processes.The performed work was divided in the following steps: data collection, methoddevelopment and concluding work. The first step consisted in gathering sufficientknowledge by conducting a thorough literature review and interviews. Then, an initialmethod was formulated and tested on a simplified silencer model. Once approvedand verified, the method was applied to the study case EATS.The study case showed that a complex product can have its acoustic pre-processingstep automated by ensuring a good connectivity among the required software anda correct denomination of the geometrical objects involved in the simulations. Themethod investigated how morphological optimisations can be performed at bothglobal and local levels to enhance the transmission loss of a silencer. Besides optimisingthe acoustic performance of the models, the method allowed the identificationof correlations and inter-dependencies among their design variables and ouput parameters.
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Noya, Pozo Rubén, and Antoine Bouilloux-Lafont. "Development of Acoustic Simulations using Parametric CAD Models in COMSOL." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263872.
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With constantly changing regulations on emissions, heavy commercial vehicles manufacturers have to adapt for their products to preserve their quality while meeting these new requirements. Over the past decades, noise emissions have become a great concern and new stricter laws demand companies to decrease their vehicle pass-by noise target values. To address the requirements from different disciplines, Scania follows a simulation driven design process to develop new concept models EATS. The collaboration among engineers from different fields is thereby necessary in order to obtain higher performance silencers. However, the preprocessing step in terms of acoustic simulations is time-consuming, which can slow the concept development process. In this thesis, a new method was introduced to automate the pre-processing of silencer acoustic models and allow for design optimisation based on acoustic performance results. A common Scania product study case was provided to several theses within the NXD organisation. The collaboration among the master thesis workers aimed to demonstrate the benefits of KBE and MDO and how they can be integrated within Scania’s current concept development and product introduction processes. The performed work was divided in the following steps: data collection, method development and concluding work. The first step consisted in gathering sufficient knowledge by conducting a thorough literature review and interviews. Then, an initial method was formulated and tested on a simplified silencer model. Once approved and verified, the method was applied to the study case EATS. The study case showed that a complex product can have its acoustic pre-processing step automated by ensuring a good connectivity among the required software and a correct denomination of the geometrical objects involved in the simulations. The method investigated how morphological optimisations can be performed at both global and local levels to enhance the transmission loss of a silencer. Besides optimising the acoustic performance of the models, the method allowed the identification of correlations and inter-dependencies among their design variables and ouput parameters.<br>Med ständiga förändringar i lagkrav som berör utsläpp måste tillverkare av tunga fordon anpassa sina produkter för att upprätthålla kvalitén samtidigt som de möter de nya kraven. De senaste årtiondena har ljudnivåerna från fordon blivit ett orosmoment, det stiftats striktare lagar som berör den ljudnivå som tunga fordon får emittera under ett förbifartsprov. För att adressera kraven från de olika disciplinerna följer Scania en simuleringsdriven utvecklingsprocess vid utveckling av nya efterbehandlingssystem. Samarbetet mellan ingenjörer från olika fält är därför nödvändigt för att utveckla högre prestanda efterbehandlingsystem. Uppställningen utav de akustiska simuleringarna är tidskrävande, vilket kan leda till en långsam utvecklingsprocess. I detta examensarbete föreslås en ny metod för att introducera en automatiserad uppställning av akustiska simuleringar på efterbehandlingssystem som tillåter optimering av de akustiska egenskaperna. Ett gemensamt studiefall gavs av Scania till flera examensarbeten skrivna vid NXD organisationen. Samarbetet mellan de olika examensarbetena syftade på att demonstrera fördelarna med KBE och MDO och hur de kan bli integrerade i Scanias nuvarande konceptutvecklings- och produktintroduktionsprocess. Examensarbetet är uppdelat i följande steg; datainsamling, metodutveckling och avslutandearbete. Det första steget innefattade insamling av kunskap genom att genomföra en grundlig litteraturstudie och flera intervjuer. Det nästkommande steget innefattade formulering av en initial metod vilken testades på ett simplifierat efterbehandlingssystem. När detta hade verifierats och godkänts applicerades metoden på efterbehandlingssystem i fallstudien. Fallstudien visade att även för en komplex produkt kan uppställningen av de akustiska simuleringarna bli automatiserade genom att säkerställa en bra koppling mellan de olika mjukvarorna och en korrekt benämning av de geometriska objekten involverade i simuleringen. Metoden undersökte hur morfologiska optimeringar kan bli genomförda både på en vittomfattande och lokal nivå för att förbättra transmissionsförlusten i ett efterbehandlingssystem. Förutom att optimera den akustiska prestandan av modellen kunde flera korrelationer mellan de olika konstruktiosparametrar identifieras likväl kunde korrelationer mellan konstruktiosparametrar och systemegenskaperna.
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Sadler, Jonathan Edwin. "Frameworks for Part Generation in Multiple CAD Systems and for CAD Simulation with Multiple Users." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8755.
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Companies often require designers to work with and operate between different computer-aided design (CAD) systems. To interoperate between these systems, a neutral design standard for CAD models is needed that allows for generation, customization, and parameterization. Current standards often fail to incorporate file history and design intent. The research proposes a simplified, neutral design format that can be used to generate models in different CAD systems. The format proposes additional functionality not yet found in existing neutral formats or scripts. The system was tested by generating models in both NX and CATIA, then comparing the models for accuracy, flexibility, and similarity of the results. Utilizing the principles established with the neutral framework, a system was developed that facilitates a collaborative CAD modeling environment that supports the interaction of models within virtual reality (VR). A framework is presented that allows for the models to be created and then used in VR without the need for conversion. Strategies are discussed for minimizing the impacts of latency and unit testing was conducted to evaluate functionality. Furthermore, feasibility of using modern game engines such as Unity, Unreal Engine, and Godot to aid in the development of both VR and physics simulations are discussed. The above foundation and frameworks enhance collaboration in training and simulation in VR environments. This research demonstrates that by using neutral design standards, collaboration could be improved between different software, as well as between different engineers. Common strategies can be used for solving issues with conversions across the design space and integrated into future VR systems. This research will be indispensable to furthering studies of collaboration and design in remote environments.
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Bowman, Kelly Eric. "Neutral Parametric Database, Server, Logic Layers, and Clients to Facilitate Multi-EngineerSynchronous Heterogeneous CAD." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5656.
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Engineering companies are sociotechnical systems in which engineers, designers, analysts, etc. use an array of software tools to follow prescribed product-development processes. The purpose of these amalgamated systems is to develop new products as quickly as possible while maintaining quality and meeting customer and market demands. Researchers at Brigham Young University have shortened engineering design cycle times through the development and use of multiengineer synchronous (MES) CAD tools. Other research teams have shortened design cycle-times by extending seamless interoperability across heterogeneous design tools and domains. Seamless multi-engineer synchronous heterogeneous (MESH) CAD environments is the focus of this dissertation. An architecture that supports both MES collaboration and interoperability is defined, tested for robustness, and proposed as the start of a new standard for interoperability. An N-tiered architecture with four layers is used. These layers are data storage, server communication, business logic, and client. Perhaps the most critical part of the architecture is the new neutral parametric database (NPDB) standard which can generically store associative CAD geometry from heterogeneous CAD systems. A practical application has been developed using the architecture which demonstrates design and modeling interoperability between Siemens NX, PTC's Creo, and Dassault Systemes CATIA CAD applications; Interoperability between Siemens' NX and Dassault Systemes' CATIA are specifically outlined in this dissertation. The 2D point, 2D line, 2D arc, 2D circle, 2D spline, 3D point, extrude, and revolve features have been developed. Complex models have successfully been modeled and exchanged in real time across heterogeneous CAD clients and have validated this approach for MESH CAD collaboration.
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Chua, Hung Soon. "Shape sensitivity of parametric CAD models and strategies for their improvement." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546029.
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Zubairi, Mohammad Shaheer. "Using parametric sensitivity analysis to detect design intent in CAD assemblies." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675418.
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The intellectual arrangement of parts in an assembly is a difficult task. Modern CAD environments contain tools which allow CAD part models to be brought together and problems such as clashes to be discovered. Clashes occur when components in an assembly unintentionally violate others. If clashes are not identified and designed out before manufacture, the physical parts will not assemble together without rework. This work introduces a novel approach for eliminating clashes by identifying which parameters defining the part features in a CAD assembly need to change, and by how much, to eliminate the clashes. Consideration is given to the fact that it is sometimes preferable to modify some components in an assembly rather than others, and that some components in an assembly cannot be modified as the designer does not have control over their shape. One of the interesting insights offered by this work is that certain aspects of design intent related to component interfaces in an assembly can be enforced by identifying the faces between the different components, and understanding the effect of parameters which define the model has on them. The work presented in this thesis determines which parameters should be related to one another and, more importantly, how parametric sensitivities are used to: (a) identify parametric relationships between different parameters in the CAD assembly, and (b) constrain the assembly using the identified relationships to define the design intent of the assembly. The developed processes advances the state-of-the-art CAD systems by explicitly determining the relationships between the parameters and eliminating clashes in CAD models. A well-captured design intent for assembly models will enable the designer to design out manufacturing and assembly difficulties at an early product development stage. The approaches have been tested on a number of example models in this thesis.
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Freeman, Robert Steven. "Neutral Parametric Canonical Form for 2D and 3D Wireframe CAD Geometry." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5688.
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The challenge of interoperability is to retain model integrity when different software applications exchange and interpret model data. Transferring CAD data between heterogeneous CAD systems is a challenge because of differences in feature representation. A study by the National Institute for Standards and Technology (NIST) performed in 1999 made a conservative estimate that inadequate interoperability in the automotive industry costs them $1 billion per year. One critical part of eliminating the high costs due to poor interoperability is a neutral format between heterogeneous CAD systems. An effective neutral CAD format should include a current-state data store, be associative, include the union of CAD features across an arbitrary number of CAD systems, maintain design history, maintain referential integrity, and support multi-user collaboration. This research has focused on extending an existing synchronous collaborative CAD software tool to allow for a neutral, current-state data store. This has been accomplished by creating a Neutral Parametric Canonical Form (NPCF) which defines the neutral data structure for many basic CAD features to enable translation between heterogeneous CAD systems. The initial architecture developed begins to define a new standard for storing CAD features neutrally. The NPCF's for many features have been implemented in a multi-user interoperability program and work between NX and CATIA CAD systems. The 2D point, 2D line, 2D arc, 2D circle, 2D spline, 3D point, extrude, and revolve NPCF's will be specifically defined. Complex models have successfully been modeled and exchanged in real time and have validated the NPCF approach. Multiple users can be in the same part at the same time in different CAD systems and create and update models in real time.
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Luu, ViChi. "Methodology development for parametric CAD modeling in CATIA V5 to aid simulation driven design using turbine volute as a case study." Thesis, Linköpings universitet, Maskinkonstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125628.
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This report is the documentation of a master’s thesis which was conducted at Scania CV AB in Södertälje. In this study, the benefits, challenges and conditions of using parametric CAD-models for aiding CFD-simulations and performance-optimization in the product development within internal combustion engines have been assessed. The goal of the thesis included developing and proposing a methodology for design engineers at Scania which will aid them in creating parametric CAD-models which are robust, flexible, comprehensible and intelligent. The study also included assessing the benefits and pre-requisites of such methodology with both practical and theoretical approaches. The ultimate goal of this entire study was to create value for the organization by reducing lead-time in the design process while promoting the production of high quality products. A case-based approach was applied in the study in which modeling strategies resulting from practical investigations and analyzing existing methodologies were implemented on a CAD-model representing the gas-volume of a turbine volute. The chosen strategies were evaluated and subsequently documented as a part of the methodology or discarded depending on its support for the parameterization. The final methodology itself was evaluated based on the quality of the parameterized CAD-model, the time required to create the model and its compatibility to the present design process at Scania CV AB. Finally the methodology was discussed with respect to the different evaluations, and the defined research questions were discussed and answered. The results of the thesis revealed that if parametric CAD-models are made in a structured, standardized and conscious manner, they are able to be highly robust and flexible which gives the models the ability to assume a big set of different forms. The methodology is recommended to be tested in a pilot project and be implemented through internal courses at the company. It was concluded that a methodology which aids the design engineers in creating parametric CAD-models will be the key towards implementing parametric CAD-models in the company and also enabling the many benefits of parameterization, which includes reduced lead-time, enhanced component performance, increased knowledge about the component, and promotion of collaboration among engineers. It was also concluded that parametric models are best suited when the existing design freedom is big and when the time permits performance analyses via optimizations, while challenges include ensuring that the model is parameterized correctly with respect to the CFD-engineers’ wishes while taking into account the requirements from other disciplines. Therefore it is very important to establish a communication between the different engineers. Ultimately, when parametric models are established in the organization, they are recommended to be implemented eventually in both short-term and long-term projects within Scania for its beneficial properties.
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Salehi-Douzloo, Vahid. "An integrated approach to parametric associative design for powertrain components on the automotive industry." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558865.
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The automotive engineering process is characterized by a long and complex design process which starts with the first sketches in the preliminary design phase and proceeds to the final detailed CAD and physical models. In this process, every design phase includes different process steps and tasks which are closely interconnected with each other. Therefore the different design stages demand capable Computer Aided Design (CAD) systems which are able to handle the different kinds of design information created and manipulated in the process. Currently in automotive practice, parametric and associative (PA) CAD systems are widely applied in the product development process. Such systems allow design knowledge to be embedded in CAD models by means of rules and formulae. In addition, CAD parts and assemblies can be generated faster and easier by modification of design parameters and therefore there is a possibility to create different CAD model variants which are based on the same CAD model. The four key element of the following work are (a) to identify the problems during the design process with parametric and associative (PA) methods during a three year of study and also the analysis of the literature survey. Furthermore (b) in this study the author will develop and implement a newly developed PA design approach (PARAMASS) in a ―real‖ industrial context. Beside this the following work will (c) discuss the issues which are important during the implementation of the developed PA approach in an industrial surrounding. The last key element (d) is to develop an evaluation approach for the PARAMASS approach during the application in an industrial context. In this case the author will be able to do action research in the industry and get first hand information during the accomplishment of these key elements. This thesis presents the results of a research programme carried out using the design research methodology of Blessing and Chakrabarti, aimed at understanding the difficulties and challenges faced by designers in using PA CAD systems and then developing and evaluating an integrated approach to the creation of PA CAD models in an automotive power train design context. Firstly, this thesis presents a review of the state of the art in PA design methods and approaches and also reviews previous research on the development of methodologies for the construction of PA CAD models. It then presents results of a descriptive study of the use of PA CAD tools and methods in vehicle power train design in an automotive original equipment manufacturer and in companies in its supply chain using questionnaires, interviews, tests and other field studies with a number of practising engineers. This study identified a number of issues faced by designers in the use of PA CAD tools and allowed the requirements for improved methods for the use of PA CAD tools to be formulated and indicators identified for their evaluation. Based on the results of the descriptive study a new integrated parametric associative (PA) approach for the design process of power train components was created in a prescriptive study stage. The approach, called PARAMASS, allows designers to construct and modify models in a methodical way based on three main phases: a specification phase to prepare the relevant parameters and associative relationships, a structuring phase that allows part and assembly structures to be created and a modification phase in which the created parametric and associative information can be modified and changed. The method makes extensive use of predefined structures matrix approaches adapted from the Design Structure Matrix. The prescriptive study phase of the research was followed by a second descriptive study to evaluate and investigate in both a qualitative and quantitative way the changes achieved by the PARAMASS approach. The qualitative evaluation was based on the Goal Question Metric approach and showed that there are advantages related to the reusability aspects like learning, application and acceptance of the developed integrated approach. The quantitative evaluation was based on the Use Case approach and demonstrated good advantages in applying the developed approach, but dependent on the complexity of the created parts and assemblies.
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Ceran, Murat. "Parametric human spine modelling." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/7958.
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3-D computational modelling of the human spine provides a sophisticated and cost-effective medium for bioengineers, researchers, and ergonomics designers in order to study the biomechanical behaviour of the human spine under different loading conditions. Developing a generic parametric computational human spine model to be employed in biomechanical modelling introduces a considerable potential to reduce the complexity of implementing and amending the intricate spinal geometry. The main objective of this research is to develop a 3-D parametric human spine model generation framework based on a command file system, by which the parameters of each vertebra are read from the database system, and then modelled within commercial 3-D CAD software. A novel data acquisition and generation system was developed as a part of the framework for determining the unknown vertebral dimensions, depending on the correlations between the parameters estimated from existing anthropometrical studies in the literature. The data acquisition system embodies a predictive methodology that comprehends the relations between the features of the vertebrae by employing statistical and geometrical techniques. Relations amongst vertebral parameters such as golden ratio were investigated and successfully implemented into the algorithms. The validation of the framework was carried out by comparing the developed 3-D computational human spine models against various real life human spine data, where good agreements were achieved. The constructed versatile framework possesses the capability to be utilised as a basis for quickly and effectively developing biomechanical models of the human spine such as finite element models.
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Li, Dong. "Physics- and engineering knowledge-based geometry repair system for robust parametric CAD geometries." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348924/.
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In modern multi-objective design optimisation, an effective geometry engine is becoming an essential tool and its performance has a significant impact on the entire process. Building a parametric geometry requires difficult compromises between the conflicting goals of robustness and flexibility. The work presents a solution for improving the robustness of parametric geometry models by capturing and modelling relative engineering knowledge into a surrogate model, and deploying it automatically for the search of a more robust design alternative while keeping the original design intent. Design engineers are given the opportunity to choose from a list of optimised designs to balance the robustness of the geometry and the original design intent. The prototype system is firstly tested on a 2D intake design repair example and shows the potential to reduce the reliance on human design experts in the conceptual design phase and improve the stability of the optimisation cycle. It also helps speed up the design process by reducing the time and computational power that could be wasted on flawed geometries or frequent human interferences. A case-study of the proposed repair system based on the design and analysis of a three-dimensional parametric turbine blade model has been set up. An automatic analysis workflow is set up and the results are summarised for setting up a repair database based on surrogate training methods. Positive repair results have been achieved and an automatic repair cycle for the blade model is being set up and tested. The proposed physics and engineering knowledge based geometry repair system for robust parametric geometries proves an effective tool for ensuring automation robustness and design flexibility.
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Satish, Prabhu Nachiketh, and Ranjan Tunga Sarapady. "Evaluation of parametric CAD models from a manufacturing perspective to aid simulation driven design." Thesis, Linköpings universitet, Maskinkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167724.
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Scania are known among to be the world’s leading supplier of transport solutions for heavy trucks and buses. Scania’s goal is to develop combustion engines that achieve low-pollutant emissions as well as lower carbon-footprint with higher efficiency. To achieve the above Scania has invested resources in Simulation Driven Design of parametric CAD models which drives design innovation rather than following the design. This enables in creating flexible and robust models in their design process. This master thesis is being conducted in collaboration with Scania exhaust after treatment systems department, focusing on developing a methodology to automatically evaluate the cost and manufacturability of a parametric model, which is intended for an agile working environment with fast iterations within Scania. From the thesis methodology’s data collection process literature study, former thesis work and interviews with designers and cost engineers at Scania, a proposed method is developed that can be implemented during the design process. The method involved four different phase they are Design phase, Analysis phase, Validation phase and Improvement phase. The proposed method is evaluated to check the method feasibility for evaluation on parameteric CAD parts for manufacturability and costing. This proposed method is applied on two different parts of a silencer as part of a case study which is mainly to evaluate the results from Improvement phase. The focus of this thesis is to realise the proposed method through simulation software like sheet metal stamping/forming simulation, cost evaluating tool where the simulation driven design process is achieved. This is done with the help of collaboration between parameteric CAD models and the above simulation software under a common MDO framework through DOE study run or optimisation study runs. The resultant designs is later considered to be improved design in terms of manufacturability and costing.
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Maksoud, Aref. "Parametric Design and Digital Fabrication: Journey with parametric design and digital fabrication in architecture." Doctoral thesis, Universitat Internacional de Catalunya, 2017. http://hdl.handle.net/10803/456562.
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Complexity and Strategies for parametric design in architecture. An
application of practice led research. Nowadays a new specialist design role is
emerging in the construction industry. The primary task related to this role is
focused on the control, development and sharing of geometric information
with members of the design team in order to develop a design solution.
Individuals engaged in this role can be described as a parametric designers.
Parametric design involves the exploration of multiple solutions to
architectural design problems using parametric models. In the past these
models have been defined by computer programs, now commercially
available parametric software provides a simpler means of creating these
models. It is anticipated that the emergence of parametric designers will
spread and a deeper understanding of the role is required.
This thesis is aimed at establishing an understanding of the tasks related to
this new specialism and to develop a set of considerations that should be
made when undertaking these tasks. The position of the parametric designer
in architectural practice presents new opportunities in the design process this
thesis also aims to capture these.
Through research and design, this thesis seeks to answer two questions:
what is parametric design and how can it benefit the field of architecture?
Looking at historical and present-day sources, the evolution of computer
aided design has been drawn out leading to the emergence of parametric
design. An explanation and analysis of parametric tools, including a series of
case studies, has been conducted to show how these tools are presently
being utilized by designers.
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Cournoyer, Richard John. "The Application of Parametric Software into the Undergraduate Computer-Aided Manufacturing Environment." Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1078.
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"This thesis presents an in depth study of Pro/Engineer's manufacturing module and its application into the Computer-Aided Manufacturing (CAM) undergraduate education environment. Mechanical Engineering has a lot to gain by incorporating computers into the undergraduate curriculum in comparison to only the traditional classroom surroundings. Today, complex problems can be solved in mere seconds thanks to the power and speed of current computers. Likewise within today's manufacturing sector, numerical controlled (NC) machines are no longer programmed manually. In today's globally competitive manufacturing environment, integrated systems such as CAD/CAM help reduce the ever-shrinking time to market. This thesis contains the background as well as the curriculum material necessary to teach undergraduate students CAM using Pro/Engineer's manufacturing module. The curriculum material starts with the tutorials to teach and reinforce Pro/Engineer basic sketcher skills, which are necessary background information. Followed with in-depth click tutorials to teach the manufacturing module for 2 axes turning, and 3 axes hole drilling and milling. It also includes the necessary lab manuals that reinforce the class lecture material, an electronic manufacturing exam, and the students' evaluations from 2 terms when the CAM course (ME3820) was offered."
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Bowman, Kelly Eric. "Optimization Constrained CAD Framework with ISO-Performing Design Generator." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2599.pdf.
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Grandicki, Andreas, and Mattias Lokgård. "Parametric CAD Modeling to aid Simulation-Driven Design : An evaluation and improvement of methods used at Scania." Thesis, Linköpings universitet, Maskinkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138121.
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This report documents a thesis conducted at Scania CV AB in Södertälje, Sweden. The main purpose of the thesis has been to examine and improve upon current practices of parametric CAD-modeling at Scania, with the ultimate goal of increased design automation and simulation-driven design. The thesis was initiated with a literature study, mainly covering the fields of parametric CAD-modeling, design automation and knowledge-based engineering. Furthermore, a questionnaire and multiple interviews were conducted to assess the awareness and mind-set of the employees. Finally, a case-study was carried out to follow current methodologies, and address any deficiencies found. Some of the most important findings were that while parametric modeling has considerable potential in enabling design automation, it is crucial, and most beneficial in terms of automation efficiency, to start with the fundamentals, namely achieving a uniform modeling practice. With these findings, a new proposed methodology has been introduced, as well as a recommended plan for a widespread implementation of parametric modeling at Scania. Such implementation would allow for shorter lead-times, faster adaptation to changing conditions, and reduced development expenditures.
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Ilie, Katherine-Rodica, and Katherine ilie@rmit edu au. "Modelling, Simulation and Optimisation of Asymmetric Rotor Profiles in Twin-screw Superchargers." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080213.144857.
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There is a growing recognition worldwide of the need for more powerful, smaller petrol engines, capable of delivering the higher picking power of larger engines, yet still being economical and environmentally friendly when used for day-to-day driving. An engineering solution for more efficient engines has been considered by research so far. It has been identified that superchargers can potentially improve the performance of automotive engines; therefore research has focused on developing superchargers and supercharger components with higher efficiency. Of particular interest to the research presented in this thesis has been the twin-screw supercharging compressor with design adapted for automotive use (the twin-screw supercharger). The performance of this supercharger type depends on the volume and total losses of the air flow through the supercharger rotors more than on any other aspects of its behaviour. To accurately predict the efficiency of the twin-screw su percharger for matching a particular engine system, accurate supercharger design is required. The main objective of this research was the investigation of the existing limitations of twin-screw superchargers, in particular leakage and reduced efficiency, leading to the development of optimal asymmetric rotor profiles. This research has been completed in four stages defining an innovative rotor design method. The parametric three-dimensional geometric model of twin-screw supercharger rotors of any aspect ratio was developed. For model validation through visualisation, CAD rotor models with scalable data were generated in commercial CAD software and calibrated experimentally by Laser Doppler Velocimetry (LDV) tests. Calibrated rotor profile data can be transferred into CAD-CFD interface for flow simulation and performance optimisation. Through the application of this new rotor design method, new opportunities are created for the twin-screw supercharger design practice, making it a part of the engineering solution for more efficient engines.
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Junior, José Orlando Balastrero. "Modelagem e otimização de componentes mecânicos em sistemas CAD 3D com o emprego de geometrias paramétricas." Universidade de Taubaté, 2010. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=304.
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A utilização de ferramentas computacionais para modelagem de componentes (sistemas CAD) faz parte da realidade da maioria dos setores de desenvolvimento de produtos das empresas. Os sistemas CAD 3D auxiliam na visualização, simulação e análise do comportamento do protótipo digital sob condições reais, antes mesmo da construção do produto ou da peça, permitindo que os fabricantes lancem produtos com maior rapidez e menor quantidade de protótipos físicos. Uma das vantagens na utilização de sistemas CAD 3D é a parametrização dimensional, o que possibilita ganho de tempo durante as modificações do projeto e a validação de novos produtos. Este trabalho apresenta as formas de aplicação de geometrias paramétricas na otimização estrutural e como meio de redução do tempo de desenvolvimento de um projeto. A validação do projeto foi feita através da Análise por Elementos Finitos (AEF), na qual foi possível estabelecer um coeficiente de segurança aceitável para o mesmo com uma redução do seu peso final, de acordo com as necessidades estabelecidas nas diretrizes do projeto.<br>The use of computational tools for modeling of components (systems CAD) is part of the reality of the majority of the sectors of development of products of the companies. Systems CAD 3D before assist in the visualization, simulation and analysis of the behavior of the digital prototype under real conditions, exactly of the construction of the product or the part, allowing that the manufacturers launch products with bigger rapidity and minor amount of physical archetypes. One of the advantages in the use of systems CAD 3D is the dimensional parameterization, what it makes possible time profit during the modifications of the project and the validation of new products. This work presents the forms of application of parametric geometries in the structural optimization and as half of reduction of the time of development of a project. The validation of the project was made through Finite Elements Analysis (FEA), in which it was possible to establish a coefficient of acceptable security for the same with a reduction of its final weight, in accordance with the established necessities as lines of direction of the project.
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Sedláček, Petr. "Pevnostní a modální analýza v parametrických adaptivních CAD programech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218805.
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This thesis is focusing on the use of the finite element method (FEM) in program environment of Autodesk Inventor Professional (AIP) 2010. For the analysis of the components or assemblies with FEM serves the Strength analysis module of the AIP 2010, whose environment and functions are detailed in this thesis. At the conclusion practical examples of modal and static analysis on the synchronous generator rotor model are demonstrated including a brief evaluation of the results.
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Samdadia, Viren V. "Integration of 3 dimensional parametric building model with geographic information systems in educational facilities planning and management." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0608104-113001/.
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Nezamaldin, Darwn. "Parametric design with Visual programming in Dynamo with Revit : The conversion from CAD models to BIM and the design of analytical applications." Thesis, KTH, Byggvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-241167.
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Nowadays, there is a big strive to achieve faster and more accurate results of designing buildings in construction companies. Construction companies that work with the design part are continuously searching for methods to increase efficiency in the working process. Autodesk have introduced a software that uses parametric design to provide input to Revit models and to retrieve and manipulate the outcomes of Revit models. The Dynamo software uses visual programming and is connected directly to Revit where the user can gain access to Revit’s data structure where parameters can be controlled and manipulated. This research consists of two parts. The first part shows how 2D Autocad drawing can be converted into 3D Revit models. This is done by using the 2D geometry as reference lines for placing BIM objects. The second part shows how the BIM model can then be used to analyze different elements with Dynamo. The calculations of element cost, weight and thermal transmission losses of floors, walls and roofs are used to illustrate this possibility. All the main goals were achieved and are presented in the report for engineers to utilize. The report illustrates the basics of Dynamo, shows examples of how to it can be used while sharing the scripts that were used for this research. The report also encourages other competent students to continue where this thesis ended. Even though several tasks were achieved in this thesis, there are still much more to learn about parametric design and visual programming.
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King, Matthew Lee. "A CAD-centric Approach to CFD Analysis With Discrete Features." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd570.pdf.
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Tarkian, Mehdi, and Zaldivar Tessier Francisco Javier. "Aircraft Parametric 3D Modelling and Panel Code of Analysis for Conceptual Design." Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10607.
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<p>Throughout the development of this report there will be a brief explanation of what the actual Aircraft Design Process is and in which stages the methodology that the authors are proposing will be implemented as well as the tools that will interact to produce this methodology.</p><p>The proposed tool will be the first part of a methodology that, according to the authors, by integrating separate tools that are currently used in different stages of the aeronautical design, will promote a decrease in the time frame for the initial stages of the design process.</p><p>The first part of the methodology above, that is proposed in this project, starts by creating a computer generated aircraft model and analyzing its basic aerodynamic characteristics “Lift Coefficient” and “Induced Drag Coefficient”, this step will be an alternative to statistical and empirical methods used in the industry, which require vast amount of data.</p><p>This task will be done in several steps, which will transfer the parametric aircraft model to an input file for the aerodynamic analysis program. To transfer the data a “translation” program has been developed that arranges the geometry and prepares the input file for analysis.</p><p>During the course of this report the reader will find references to existing aircrafts, such as the MD-11 or Airbus 310. However, these references are not intended to be an exact computer model of the mentioned airplanes. The authors are using this as reference so the reader can relate what he/she is seeing in this paper to existing aircrafts. By doing such comparison, the author intends to demonstrate that the Parametric Model that has been created possesses the capability to simulate to some extend the shape of existing aircrafts.</p><p>Finally from the results of this project it is concluded that the methodology in question is promising. Linking the two programs is possible and the aerodynamic characteristics of the models tested fall in the appropriate range. None the less the research must continue following the line that has been discussed in this report.</p>
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Haritidis, Panagiotis, and Tony Tran. "Parameterstyrd modellering av bergtunnlar." Thesis, KTH, Byggteknik och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-255607.
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Project designing in the building construction industry has developed a lot during recent years and the result is that not only 2D documents are made, but also 3D models are created to facilitate the project. A problem most players are facing daily is when conditions and information in a project change and design engineers must make necessary changes to their models. These changes can be time-consuming, and the designers may need to do these changes more than once during the project. Could a parametric 3D model make these changes faster than a CAD model when conditions and information on a project change? One of the developers that frequently needs to make changes to its models is WSP geotechnical department. The desire is to find a new working method that increases the efficiency of project design of tunnels. The aim of this thesis was to try parametric modeling as a working method and to see if this method could be used to create ground tunnels. A script has been made in Grasshopper, a visual programming plug-in that generates a parametric model of a tunnel. The parametric model was then compared with an existing CAD model created by the WSP geotechnical department in an earlier project. Pros and cons have been presented and conclusions have been made about if parametric modelling could be more efficient than current working methods. The results of this thesis indicate that parametric modelling is an efficient working method and that it could be used as a working method for future ground tunnel projects.<br>Projekteringen i byggbranschen har utvecklats mycket de senaste åren och resultatet har blivit att förutom 2D-handlingar, projekteras även 3D-modeller för att underlätta projekteringsarbetet.Ett vardagligt problem som de flesta aktörer står inför är när fler förutsättningar och information i projekt ändras och projektörer tvingas göra ändringar i sina modeller. Dessa ändringar kan vara tidskrävande och behöva göras fler än en gång under projektet. Kan en tredimensionell modell som modellerats parametriskt göra ändringar snabbare när förutsättningar i ett projekt ändras än en CAD modell?En av dessa aktörer som ständigt behöver göra ändringar i sina modeller i efterhand är WSP:s bergteknikavdelning. Önskvärt vore att hitta en ny arbetsmetod som kan effektivisera projekteringen av bergtunnlar.Detta examensarbete syftar till att undersöka om parametrisk modellering kan användas som arbetsmetod för projektering av bergtunnlar. Ett script har skapats i Grasshopper, ett visuellt programmeringstillägg som genererar en parametrisk modell av en tunnel. Den parametriskt skapade modellen har sedan jämförts med en befintlig CAD-modell som skapats av WSP:s bergtekniksavdelning i ett tidigare projekt.Fördelar och nackdelar har lyfts fram och slutsatser har dragits om huruvida parametrisk modellering kan vara mer effektiv än nuvarande arbetsmetoder.Resultaten av detta examensarbete pekar mot att parametrisk modellering är en effektiv arbetsmetod och skulle kunna användas för framtida tunnelprojekt.
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Fisher, Matthew Jackson. "Parametric Optimization Design System for a Fluid Domain Assembly." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2373.pdf.
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Dorribo, Camba Jorge. "ANNOTATION MECHANISMS TO MANAGE DESIGN KNOWLEDGE IN COMPLEX PARAMETRIC MODELS AND THEIR EFFECTS ON ALTERATION AND REUSABILITY." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/45997.
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El proyecto de investigación propuesto se enmarca dentro del área de diseño de producto con aplicaciones de modelado sólido CAD/CAM (Computer Aided Design/Computer Aided Manufacturing). Concretamente, se pretende hacer un estudio de las herramientas de anotación asociativas disponibles en las aplicaciones comerciales de modelado CAD con el fin de analizar su uso, viabilidad, eficiencia y efectos en la modificación y reutilización de modelos digitales 3D, así como en la gestión y comunicación del conocimiento técnico vinculado al diseño.
La idea principal de esta investigación doctoral es establecer un método para representar y evaluar el conocimiento implícito de los ingenieros de diseño acerca de un modelo digital, así como la integración dinámica de dicho conocimiento en el propio modelo CAD, a través de anotaciones, con el objetivo de poder almacenar y comunicar eficientemente la mayor cantidad de información útil acerca del modelo, y reducir el tiempo y esfuerzo requeridos para su alteración y/o reutilización.<br>Dorribo Camba, J. (2014). ANNOTATION MECHANISMS TO MANAGE DESIGN KNOWLEDGE IN COMPLEX PARAMETRIC MODELS AND THEIR EFFECTS ON ALTERATION AND REUSABILITY [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/45997<br>TESIS
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Mokbel, Hala. "Assessing the parametric building model capabilities in minimizing change orders." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0203103-134504.
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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: Change orders; Change orders due to errors & omissions; 3D parametric building modeling; CAD systems; Project design coordination; Design documents. Includes bibliographical references (p. 99-102).
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TAMBE, SOURABH M. "INCORPORATING GEOMETRIC TOLERANCE INFORMATION IN SOLID MODELS TO BUILD AUTOMATED INSPECTION SYSTEMS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092924245.
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Mohamed, Hassan Liban, and Haris Hodzic. "Modular and Flexible Payload Arrangement : With Reconfigurable Floors and Sliding Bulkheads." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21854.
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Background The shipbuilding trends have changed from being single purpose ships only to using modular and flexible parts or systems to carry out multiple missions with as few ships as possible to minimize the ecological and economic impact. A flotilla can become smaller by having multiple ships capable of carrying out various missions instead of single-purpose ships. Objectives The objectives throughout the thesis are to provide an insight into how the trends today are affecting the market of surface ships and to study how a reconfigurable floor can be combined with a sliding bulkhead to be implemented into the cargo space. The developed concept needs to meet the regulations set by DNV-GL, which are an international classification society that is experts in risk management and quality assurance. This master’s thesis focuses on how to implement modularity and flexibility in payload arrangement for surface ships. Method The work process is based on the methodology design thinking’s four phases, which are initiation, inspiration, ideation, and implementation. Throughout the project, a trendwatching was conducted to determine the most impactful trends on the naval market. Using semi-structured interviews, techwatching and brainstorming iterations, a requirements list was defined to support the concept development. The concepts were weighed against each other, and the highest scoring was developed into a parametric CAD model. The model was later compared to the DNV-GL regulations to see whether the developed concept affects existing systems such as HVAC. Results Some of the top trends that have been affecting the naval market lately is modularity, flexibility, and unmanned surface vessels. The developed concept was a combination of a pallet loading floor and cargo floor rollers for reconfigurable floors and garage door-inspired bulkhead. The concept was visualized in Autodesk Inventor Professional 2020 to be further analyzed and display how the concept operates, its functions and how the system compares to DNV-GL regulations. Conclusions The top trends affecting the naval market are modularity, flexibility, and unmanned surface vessels to mention a few. Some of the regulations from DNV-GL that need to be considered when implementing a modular and flexible payload arrangement are fire protection and tightness requirements. However, the regulations can be stricter or changed depending on the role, design, and placement of the payload arrangement.
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Shumway, Devin James. "Hybrid State-Transactional Database for Product Lifecycle Management Features in Multi-Engineer Synchronous Heterogeneous Computer-Aided Design." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6341.
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There are many different programs that can perform Computer Aided Design (CAD). In order for these programs to share data, file translations need to occur. These translations have typically been done by IGES and STEP files. With the work done at the BYU CAD Lab to create a multi-engineer synchronous heterogeneous CAD environment, these translation processes have become synchronous by using a server and a database to manage the data. However, this system stores part data in a database. The data in the database cannot be used in traditional Product Lifecycle Management systems. In order to remedy this, a new database was developed that enables every edit made in a CAD part across multiple CAD systems to be stored as well as worked on simultaneously. This allows users to access every action performed in a part. Branching was introduced to the database which allows users to work on multiple configurations of a part simultaneously and reduces file save sizes for different configurations by 98.6% compared to those created by traditional CAD systems.
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Jensen, Kimberly A. "Bio-Surfaces and Geometric References for a Standardized Biomechanical Design Methodology for Mass Customization." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1274.
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This dissertation presents a method for the design of customizable products that interface with the human body. The method presented involves first, a consistent method of capturing and representing the human model so that the model can be used with CAx tools and solid modeling techniques. Second, it provides a design methodology based on feature structure planning and assembly modeling that provides a consistent structure to the design process so that it can be reused and parameterized. Third, a strategy for identifying parametric variables that are referenced to the human body is introduced. The core of this method is the definition of biomechanical products as an assembly model, where human data is defined as the base part. This research expands on traditional mating conditions in assembly model methods by identifying different ways products can interface with the human body. With the identification of these mating conditions, products can be designed to interact with the body in definable ways through the definition of parametric strategies. This dissertation also presents the necessary theoretical and numerical methods for implementation of these mating conditions in a CAD system.
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M, Venkata Raghu Chaitanya. "Model Based Aircraft Control System Design and Simulation." Thesis, Linköping University, Linköping University, Department of Management and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19264.
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<p>Development of modern aircraft has become more and more expensive and time consuming. In order to minimize the development cost, an improvement of the conceptual design phase is needed. The desired goal of the project is to enhance the functionality of an in house produced framework conducted at the department of machine design, consisting of parametric models representing a large variety of aircraft concepts.</p><p>The first part of the work consists of the construction of geometric aircraft control surfaces such as flaps, aileron, rudder and elevator parametrically in CATIA V5.</p><p>The second part of the work involves designing and simulating an Inverse dynamic model in Dymola software.</p><p>An Excel interface has been developed between CATIA and Dymola. Parameters can be varied in the interface as per user specification; these values are sent to CATIA or Dymola and vice versa. The constructed concept model of control surfaces has been tested for different aircraft shapes and layout. The simulation has been done in Dymola for the control surfaces.</p>
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Eklund, Adam, and Jesper Karner. "Development of a Framework for Concept Selection and Design Automation : Utilizing hybrid modeling for indirect parametric control of subdivision surfaces." Thesis, Linköpings universitet, Maskinkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-147755.
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Saab Aeronautics’ section Overall Design and Survivability develops early aircraft concepts and utilizes Computer Aided Design (CAD) to ensure the feasibility of principal- and critical characteristics. Saab has over the years developed several start models of aircrafts in CAD from pre-defined aircraft configurations, which are to some extent non-generic. When new configurations are to be explored, manual- and repetitive work is required if the new configuration cannot be attained solely through parametric modifications of a start model. The complexity of these CAD models also demands great knowledge of how aircraft components interact with each other to ensure compatibility. The project covered in this thesis was thus carried out to develop a more effective way for Saab to create and explore a larger design space. This by creating a framework that consists of a product configurator coupled with a library of generic CAD models. The product configurator that was created is the Saab Tradespace Analyzer & Reconfigurator (STAR), which takes compatibility relationships into consideration to facilitate concept selection. The STAR also provides a dynamic design space calculation to indicate how close the user is to a final concept selection. Two generic CAD models were created, a fuselage model and an air inlet model. A skeleton model was also created in order to reduce model dependencies and to control the main geometry of the aircraft product. In addition to these, an already existing wing model was implemented to form the library of generic CAD models. The framework coupling the STAR with the CAD library utilizes design automation to allow automatic CAD model generation of a concept that has been selected within the STAR. It was concluded through extrapolation that the created framework would allow Saab to create and explore a larger design space in a more effective way than what is done today, provided the library of CAD models were to contain the same number of components as today’s start models.
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Svensson, Marcus, and Daniel Haraldsson. "Integrating Design Optimization in the Development Process using Simulation Driven Design." Thesis, Linköpings universitet, Maskinkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157374.
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This master thesis has been executed at Scania CV AB in Södertälje, Sweden. Scania is a manufacturer of heavy transport solutions, an industry which is changing rapidly in order to meet stricter regulations, ensuring a sustainable future. Continuous product improvements and new technologies are required to increase performance and to meet markets requirements. By implementing design optimization in the design process it enables the potential of supporting design exploration, which is beneficial when products with high performance are developed. The purpose was to show the potential of design optimization supported by simulation driven design as a tool in the development process. To examine an alternative way of working for design engineers, elaborating more competitive products in terms of economical and performance aspects. Furthermore, to minimize time and iterations between divisions by developing better initial concept proposals. The alternative working method was developed iteratively in parallel with a case study. The case study was a suction strainer and were used for method improvements and validation, as well as decision basis for the included sub-steps. The working method for implementing design optimization and simulation driven design ended up with a procedure consisted of three main phases, concept generation, detail design and verification. In the concept generation phase topology optimization was used, which turned out to be a beneficial method to find optimized solutions with few inputs. The detail design phase consisted of a parameterized CAD model of the concept which then was shape optimized. The shape optimization enabled design exploration of the concept which generated valuable findings to the product development. Lastly the optimized design was verified with more thorough methods, in this case verification with FE-experts. The working method was tested and verified on the case study component, this resulted in valuable knowledge for future designs for similar components. The optimized component resulted in a performance increase where the weight was decrease by 54% compared with a reference product.
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Abondano, Franco David Humberto. "De la arquitectura moderna a la arquitectura digital: La influencia de la revolución industrial y la revolución informacional en la producción y la cultura arquitectónica." Doctoral thesis, Universitat Ramon Llull, 2018. http://hdl.handle.net/10803/664655.
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L'arquitectura contemporània està sotmesa a un procés de transformació a causa del desenvolupament i integració de les tecnologies digitals en els processos de disseny i de construcció; un procés que evoca el que va tenir lloc durant la revolució industrial, que va cristal·litzar en l'arquitectura moderna. Avui ens trobem immersos en un període històric en què està emergint una arquitectura sense precedents, com a conseqüència de la progressiva assimilació dels nous materials i tècniques de producció digital, tal com va passar en els inicis del segle vint, quan la mecanització, l'estandardització, i la producció en massa de nous materials i components constructius van establir les bases de l'arquitectura moderna.
Amb l'adveniment de les tecnologies digitals, l'arquitectura ha entrat en un període de transició, que abasta el temps que es requereix per traduir en fets arquitectònics les conseqüències de la nova revolució tecnològica. A més de transformar els processos de producció material, el desenvolupament tecnològic comporta canvis en els processos i en els conceptes que determinen tant el disseny com el valor estètic de les obres d'arquitectura. En aquesta tesi es explora la influència dels nous processos de disseny i fabricació assistits per ordinador (CAD/CAM) en l'arquitectura actual: en la manera de concebre, construir i interpretar les produccions de l'arquitectura.
La investigació parteix de la premissa que l'arquitectura es troba en un període de transició en plena efervescència, un període que cal entendre com un estat de flux, un esdevenir. En aquest context de canvi, una anàlisi centrat en l'estat actual de l'arquitectura corre el risc de caure ràpidament en l'obsolescència, ja que qualsevol tècnica, eina o teoria relativa als processos de disseny i fabricació digital es pot veure superada per la velocitat de els canvis tecnològics.
Per comprendre els canvis que estan tenint lloc en l'actualitat, es proposa una anàlisi simultani de les dues revolucions tecnològiques que han transformat la manera de concebre i construir l'arquitectura en els dos últims segles: la revolució industrial i la seva influència en l'arquitectura moderna, i l'actual revolució digital, i l'arquitectura a la qual està donant lloc. Aquesta anàlisi paral·lel es porta a terme atenent els materials, eines, i processos de producció, així com als conceptes, principis i ideals que en els dos períodes -la revolució industrial, i la revolució digital- han forjat una cultura arquitectònica pròpia de cada època.
La contraposició entre l'arquitectura moderna i l'arquitectura digital es realitza a partir d'una anàlisi històrica dels processos de producció en les revolucions tecnològiques que hi ha darrere cadascuna -industrial i informacional-. Així, contràriament a la historiografia que planteja una relació de causalitat entre idees i formes arquitectòniques, una de les premisses d'aquesta tesi és que tant les idees com les formes que caracteritzen l'arquitectura d'un determinat període històric, responen en gran mesura als mitjans i les maneres de producció del seu temps.
En contraposar l'arquitectura moderna i l'arquitectura digital es planteja una relació de continuïtat entre ambdues, de manera que l'arquitectura moderna seria el precedent de l'arquitectura digital, en tant que va ser la primera a integrar la tecnologia en els processos de creació arquitectònica. Per això, aquest estudi de l'arquitectura digital part dels inicis de l'era moderna, o de la modernitat, l'època en la qual l'arquitectura comença a adoptar els mètodes de producció basats en principis tècnics i científics.<br>La arquitectura contemporánea está sometida a un proceso de transformación a causa del desarrollo e integración de las tecnologías digitales en los procesos de diseño y de construcción; un proceso que evoca al que tuvo lugar durante la revolución industrial, que cristalizó en la arquitectura moderna. Hoy nos encontramos inmersos en un período histórico en que está emergiendo una arquitectura sin precedentes, como consecuencia de la progresiva asimilación de los nuevos materiales y técnicas de producción digital, tal como sucedió en los inicios del siglo veinte, cuando la mecanización, la estandarización, y la producción en masa de nuevos materiales y componentes constructivos sentaron las bases de la arquitectura moderna.
Con el advenimiento de las tecnologías digitales, la arquitectura ha entrado en un periodo de transición, que abarca el tiempo que se requiere para traducir en hechos arquitectónicos las consecuencias de la nueva revolución tecnológica. Además de transformar los procesos de producción material, el desarrollo tecnológico conlleva cambios en los procesos y en los conceptos que determinan tanto el diseño como el valor estético de las obras de arquitectura. En esta tesis se explora la influencia de los nuevos procesos de diseño y fabricación asistidos por ordenador (CAD/CAM) en la arquitectura actual: en la manera de concebir, construir e interpretar las producciones de la arquitectura.
La investigación parte de la premisa de que la arquitectura se encuentra en un periodo de transición en plena efervescencia, un periodo que cabe entender como un estado de flujo, un devenir. En este contexto de cambio, un análisis centrado en el estado actual de la arquitectura corre el riesgo de caer rápidamente en la obsolescencia, ya que cualquier técnica, herramienta o teoría relativa a los procesos de diseño y fabricación digital puede verse superada por la velocidad de los cambios tecnológicos.
Para comprender los cambios que están teniendo lugar en la actualidad, se propone un análisis simultáneo de las dos revoluciones tecnológicas que han transformado la manera de concebir y construir la arquitectura en los dos últimos siglos: la revolución industrial y su influencia en la arquitectura moderna, y la actual revolución digital, y la arquitectura a la que está dando lugar. Este análisis paralelo se lleva a cabo atendiendo a los materiales, herramientas, y procesos de producción, así como a los conceptos, principios e ideales que en ambos períodos –la revolución industrial, y la revolución digital– han forjado una cultura arquitectónica propia de cada época.
La contraposición entre la arquitectura moderna y la arquitectura digital se realiza a partir de un análisis histórico de los procesos de producción en las revoluciones tecnológicas que subyacen tras cada una –industrial e informacional–. Así, contrariamente a la historiografía que plantea una relación de causalidad entre ideas y formas arquitectónicas, una de las premisas de esta tesis es que tanto las ideas como las formas que caracterizan la arquitectura de un determinado periodo histórico, responden en gran medida a los medios y los modos de producción de su tiempo.
Al contraponer la arquitectura moderna y la arquitectura digital se plantea una relación de continuidad entre ambas, de manera que la arquitectura moderna sería el precedente de la arquitectura digital, en tanto que fue la primera en integrar la tecnología en los procesos de creación arquitectónica. Por ello, este estudio de la arquitectura digital parte de los inicios de la era moderna, o de la modernidad, la época en la cual la arquitectura empieza a adoptar los métodos de producción basados en principios técnicos y científicos.<br>Contemporary architecture is in a process of transformation due to the development and integration of digital technologies in the design and construction processes; a process that evokes the one that took place during the industrial revolution, which crystallized in modern architecture. Today we are immersed in a historical period in which an unprecedented architecture is emerging, as a consequence of the progressive assimilation of the new materials and techniques of digital production, likewise the beginning of the 20th century, when mechanization, standardization, and the mass production of new materials and construction components laid the foundations of modern architecture.
With the advent of digital technologies architecture has entered a transitional period, which includes the time needed to translate the changes driven by the new technological revolution into architectural facts. Along with material production processes, technological development has an impact on the processes and concepts that determine the design and the aesthetic value of architectural works. This thesis explores the influence of the new processes of computer-aided design and manufacturing (CAD/CAM) in current architecture: in the conception, construction and interpretation of architectural productions.
This research starts from the premise that architecture is in a transitional period in full development, a period that can be understood as a flux, a becoming. In this context of change, an analysis focused on the current state of architecture could rapidly fall into obsolescence, since any technique, tool or theory related to digital design and manufacturing processes can be overcome by the speed of technological development.
In order to understand the changes that are taking place, we propose a simultaneous analysis of the technological revolutions that have transformed the conception and construction of architecture in the last two centuries: the industrial revolution and its impact on modern architecture, and the influence of the current digital revolution on the rise of a new architecture. This simultaneous analysis considers the materials, tools, and production processes, as well as the concepts, principles and ideals that in both periods — the industrial revolution and the digital revolution — have foster an architectural culture specific to each time.
The comparison between modern architecture and digital architecture is established through a historical analysis of the production processes fostered by the technological revolutions that lie behind each one — industrial and informational. Thus, contrary to the historiography that proposes a causal relationship between ideas and architectural forms, one of the premises of this thesis is that both, the ideas and the forms that characterize the architecture of a given historical period, respond to a large extent to the means and the modes of production of their time.
By contrasting modern architecture and digital architecture a relationship of continuity between both is proposed. In this sense, modern architecture would be the precedent of digital architecture, as it was the first that results from the integration of technology into architectural creative processes. Therefore, this study of digital architecture starts from the beginnings of the modern era, or Modernity, as it is the era in which architecture begins to adopt production methods based on technical and scientific principles.
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Larson, Brady M. "Exploring the Common Design Space of Dissimilar Assembly Parameterizations for Interdisciplinary Design." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2368.pdf.
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Szoltys, Kryštof. "Parametrické CAD systémy a databáze součástí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217957.
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Autodesk Inventor is a full 3D CAD system. This system includes tools for working environment tool, component design tool including information data management and technical support. The target of the first part is to describe the most important new features brought by Autodesk Inventoru 2009 version. In of next chapters the work describes creation common iPart, which is basically different variants set (proportions, material …) of one entity, and preparation before correct publication to the content center, which is a virtual database of all iPart. Also there is presented how to create the content center, how to work with it and adjust data. The aim of work is then the creation database a stator and a rotor packet for the firm ATAS electromotor Náchod Inc. In the thesis there is described creation of the lamination as an iPart and their publication to the new content center.
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Tecklenburg, Gerhard. "Design of body assemblies with distributed tasks under the support of parametric associative design (PAD)." Thesis, University of Hertfordshire, 2011. http://hdl.handle.net/2299/5809.
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This investigation identifies how CAD models of typical automotive body assemblies could be defined to allow a continuous optimisation of the number of iterations required for the final design and the number of variants on the basis of Parametric Associative Design (PAD) and how methodologies for the development of surfaces, parts and assemblies of the automotive body can be represented and structured for a multiple re-use in a collaborative environment of concept phase of a Product Evolution (Formation) Process (PEP). The standardisation of optimised processes and methodologies and the enhanced interaction between all parties involved in product development could lead to improve product quality and reduce development time and hence expenses. The fundamental principles of PAD, the particular methodologies used in automotive body design and the principles of methodical development and design in general are investigated. The role which automotive body engineers play throughout the activities of the PEP is also investigated. The distribution of design work in concept teams of automotive body development and important methodologies for the design of prismatic profile areas is critically analysed. To address the role and distribution of work, 25 group work projects were carried out in cooperation with the automotive industry. Large assemblies of the automotive bodies were developed. The requirements for distributed design work have been identified and improved. The results of the investigation point towards a file based, well structured administration of a concept design, with a zone based approach. The investigation was extended to the process chain of sections, which are used for development of surfaces, parts and assemblies. Important methods were developed, optimised and validated with regard to an update safe re-use of 3D zone based CAD models instead of 2D sections. The thesis presents a thorough description of the research undertaken, details the experimental results and provides a comprehensive analysis of them. Finally it proposes a unique methodology to a zone based approach with a clearly defined process chain of sections for an update-safe re-use of design models.
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Bozhinovski, Konstantin. "Generative design of a nature-inspired geometry manipulated by an algorithm in a BIM-environment, applied in a façade system for a residential building in Bologna, Italy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21501/.
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In terms of technology, BIM is also part of the worldwide change Industry 4.0, which in essence is the trend toward automation and data exchange in manufacturing technologies and processes. Generative design is an iterative process that involves a program that will generate a certain number of outputs that meet certain constraints, so that a designer is able to fine tune the feasible project by changing minimal and maximal values of an interval in which a variable of the program meets the set of constraints, in order to reduce or augment the number of outputs to choose from. The initial idea of this thesis work was to manipulate few of the most basic geometric elements in order to get a complex parametric shape inspired from the honeycomb as the natures perfectly generated the element. This preliminary idea, together with the ambition to use this transformation for a façade system in a structural building led us to a series of decisions to try and connect two “worlds”, in the sense that we have a CAD environment that lets us create the geometry and a BIM environment where everything is represented by a specific level of information. This geometry is given a specific set of rules that drive and manipulate each of the elements it contains in a certain fashion. This methodology, as well as the communication and the interaction between the software adopted and their programming environments, is what makes the generative design possible. This result from the Grasshopper algorithm is then being created in the CAD environment in Rhinoceros3D, which then can be opened through Rhino.Inside.Revit and give us a direct real-time preview in the BIM environment in Revit. Through a long series of testing and experimenting with the geometry, we get to a point where we have a functional algorithm that creates and manipulates the geometry, in order to foster many design opportunities for structural and architectural designers.
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Gazda, Silvester. "Výpočtové modelování tuhosti záběru ozubených kol." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318524.
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This master's thesis deals with the design of FEM model of gear pair with an intention to find out how stiffness changes during meshing. It firstly describes the necessary knowledge needed to analyse the problem, like the geometry of an involute tooth and evaluation of meshing stiffness. Followed by a description of work procedures from the creation of models through settings of mesh, contacts and analysis to evaluating of results.
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Hjoberg, Filip. "Automation av parametrisk CAD-modellering inom programmet Inventor." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55069.
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Companies today are constantly looking to improve the lead time of design and production processes through streamlining the process and looking for new solutions. CAD, computer-aided design, is something that has been very helpful for this. By reducing the use of 2D basis and instead having 3D models as the only main basis, the CAD process has seen improvements in the form of streamlining. The next step to improving the process even further is to automate modeling in order to reduce manual processing. The problem arises when a company has a finished product model and the customer requests different specific dimensions and/or functions. Then the CAD designer must then build the model from scratch even though the changes may be minimal. This is time-consuming and creates variation in how models are built among designers. Therefore, the purpose of this thesis is to find an automatic solution that reduces the manual work. A method that allows you to change dimensions or functions directly in the same CAD file. Question at issue: Is it possible to automate the CAD process when dimensions and/or functions need to be changed on a model, without having to remodel the model manually and therefore save time? This question was answered based on an assignment given by the company Roxtec Sweden AB. The product that the CAD model would represent and work with was the product type Module, which is a sealing solution for cables and pipes. The techniques and methods to achieve the goal of this project has been extracted from threads on the Autodesk community forum and YouTube videos. Reports from similar degree projects have been helpful for the layout and writing of the report. The practical work has consisted of creating two different dummies to test the found techniques and methods on, and then apply these to the product model, Module. The approach was to name and list all parameters from the CAD model, use iLogic Rules to control and monitor parameters, functions and components with programmable logic. Then apply iLogic Forms to create a user-friendly form where the user can control the parameters, functions and components of the CAD model. The main work included creating three different parts with named and listed parameters as well as rule-scripts with iLogic Rules. Then create an assembly that was a compilation of these parts. The parts parameters and rule-scripts were linked to the assembly. Additional parameters, rule-scripts and a form were created in the assembly to achieve a fully functional automated CAD model. The result was an automated and editable CAD file, representing Roxtec's product type, Module. With the CAD file, any user can easily select the desired dimensions and functions. This avoids the need to build the product model from scratch when new values are desired. In addition, each model gets built in the same way when using this solution. The automated solution was tested against a manual method. Results yielded a total time of 15 minutes using the manual method, whereas the automated solution only took a total of 40 seconds. The automated solution proved a 95.6% less time-consuming process. This method is best suited for repeated use on several work steps, where it shows a much higher efficiency-level.<br>Att ständigt effektivisera och hitta nyalösningar som förkortar ledtiden för designprocessen och produktionsprocessen är något som företag alltid strävar efter. CAD, datorstödd konstruktion, är något som har varit till stor hjälp för detta. Genom att minska användningenav 2D-underlag och istället ha 3D-modeller som det enda underlaget, har CAD-processen effektiviserats. Nästa steg för att spara ännu mera tid är att automatisera modelleringen för att minska den manuella bearbetningen. Problemet uppstår när ett företag har en färdig produktmodell, men kunden ber om andra specifika dimensioner och funktioner. Då måste CAD-konstruktören modellera modellen från grunden även fast ändringarna kan vara minimala. Detta är tidskrävande och det blir också en naturlig variation hur modellerna byggs upp bland konstruktörerna. Därför är syftet med detta examensarbete att komma fram till en automatisk lösning som minskar tiden att skapa en modell. En metod som gör det möjligt att ändra dimensioner eller funktioner direkt i samma CAD-fil. Frågeställning: Går det att automatisera CAD-processen när dimensioner och/eller funktioner behöver ändras på en modell utan att behöva modellera om modellen manuellt och genom detta spara tid? Frågeställningen besvarades utifrån ett uppdrag givet av företaget Roxtec Sweden AB. Produkten som CAD-modellen skulle representera och arbetas med var produkttypen modul, vilket är tätningslösningar för kablar och rör. Videoklipp från Youtube och trådar på Autodesk community forum har använts mest för att hitta möjliga tekniker och metoder för att uppnå målet med examensarbetet. Rapporter från liknanden examensarbeten har varit till hjälp för upplägget och skrivandet för den egna rapporten. Det praktiska arbetet har bestått av att skapa två olika dummys för att testa de funna teknikerna och metoderna för att sedan tillämpa dessa på produktmodellen, Modulen, som var huvudarbetet med examensarbetet. Tillvägagångsättet blev att namnge och lista samtliga parametrar iCAD-modellen. Använda sig av iLogic Rules för att skapa regler som styr och kontrollerar parametrar, funktioner och komponenter med programmerbar logik. Dels att tillämpa iLogic Forms för att skapa ett användarvänligt formulär där användaren kan styra parametrarna, funktionerna och komponenterna i CAD-modellen. Genomförandet av huvudarbetet omfattades av att skapa tre olika parts med namngivna och listade parametrar samt regler med iLogic Rules. Sedan skapa en assembly som var en sammanställning av dessa parts. Parternas parametrar och regler kopplades till assemblyn. Ytterligare parametrar, regler och ett formulär skapades i assemblyn för att uppnå en fullt fungerande automatiserad CAD-modell. Resultatet blev en automatiserad och redigeringsbar CAD-fil som representerar Roxtecs produkttyp, Modul. Med CAD-filen kan en användare enkelt välja önskade mått och funktioner. Genom detta undviks behovet av att modellera produktmodellen från grunden när nya värden önskas. Dessutom får varje modell samma uppbyggnadssätt vid användning av lösningen. Ett test utfördes genom att skapa en produktmodell med den automatiserade metoden och jämföra med den manuella metoden. Det resulterade att den nuvarande manuella tog 15 minuter och den nya automatiserade lösningen tog 40 sekunder, alltså 95,6% mindre tidskrävande. Metoden passar bäst vid upprepade arbetsmoment då vissa förberedelser krävs för att tillämpa metoden. När förberedelserna är gjorda och metoden är redo att användas, sparas mycket tid och arbetet blir mer effektivt med mindre manuell bearbetning.
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Berrini, Elisa. "Modèle géométrique déformable pour la simulation et l’optimisation automatique de forme." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4036/document.
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Le contrôle précis des modèles géométriques joue un rôle important dans de nombreux domaines. Pour l’optimisation de forme en CFD, le choix des paramètres de contrôle et la technique de déformation de forme est critique. Nous proposons un modeleur paramétrique avec une nouvelle méthode de déformation d’objets, ayant pour objectif d’être intégré dans une boucle d’optimisation automatique de forme avec un solveur CFD. Notre méthodologie est basée sur une double paramétrisation des objets : géométrique et architecturale. L’approche géométrique consiste à décrire les formes par un squelette, composé d’une famille de courbes B-Splines, appelées courbes génératrice et courbes de section. Le squelette est paramétré avec une approche architecturale. Au lieu d’utiliser les points de contrôle de la représentation classique par courbes B-Splines, la géométrie est contrôlée par ces paramètres architecturaux. Cela permet de réduire considérablement le nombre de degrés de liberté utilisés dans le problème d’optimisation de forme, et permet de maintenir une description haut niveau des objets. Notre technique intègre un contrôle de forme et un contrôle de régularité, permettant d’assurer la génération de nouvelles formes valides et réalistes. Les déformations de la géométrie sont réalisées en posant un problème inverse : déterminer une géométrie correspondant à un jeu de paramètres cibles. Enfin, une technique de reconstruction de surface est proposée. Nous illustrons le modeleur paramétrique développé et intégré dans une boucle d’optimisation automatique de forme sur trois cas : un profil d’aile d’avion, un foil AC45 d’un voilier de course et un bulbe de chalutier de pêche<br>The precise control of geometric models plays an important role in many domains. For shape optimisation in CFD, the choice of control parameters and the way to deform a shape are critical. In this thesis, we propose a new approach to shape deformation for parametric modellers with the purpose of being integrated into an automatic shape optimisation loop with a CFD solver. Our methodology is based on a twofold parameterisation: geometrical and architectural. The geometrical approach consist of a skeleton-based representation of object. The skeleton is made of a family of B-Spline curves, called generating curve and section curves. The skeleton is parametrised with an architectural approach: meaningful design parameters are chosen on the studied object. Thus, instead of using the control points of a classical B-spline representation, we control the geometry in terms of architectural parameters. This reduce the number of degrees of freedom and maintain a high level description of shapes. We ensure to generate valid shapes with a strong shape consistency control based on architectural considerations. Deformations of the geometry are performed by solving optimisation problems on the skeleton. Finally, a surface reconstruction method is proposed to evaluate the shape’s performances with CFD solvers. We illustrate the parametric modeller capabilities on three problems, performed with an automatic shape optimisation loop: the wind section of an plane (airfoil), the foil of an AC45 racing sail boat and the bulbous bow of a fishing trawler
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Czakó, Alexander. "Stanovení chyby převodu u čelního ozubení s šikmými zuby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433537.
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This diploma thesis primarily deals with the transmission error issue which is one of the dominant sources of vibration in gear pairs and transmission systems. The vibrations subsequently generate noise which is often subjected to increasingly stricter demands across the industry, including the automotive one. It turns out that reducing the peak-to-peak value of the transmission error has a beneficial effect on the vibro-acoustic properties of gears and gear pairs. This thesis aims to determine the transmission error under static conditions, since a gear pair with a low static transmission error is a good assumption for a low transmission error even under dynamic effects. The resulting values of the transmission error can be influenced already during the design of the gear macro-geometry. It is also suitable to apply micro-geometric adjustments – modifications to the gear teeth. For this reason, the search part of the thesis is dedicated to theoretical knowledge, especially concerning the geometry of gears, modifications of teeth and the overall transmission error and its determination. The transmission error can be determined in several ways, including a technical experiment. However, due to time and financial reasons, this is not always possible, and therefore, the possibility of using numerical simulations is offered. In this thesis, the approach using stress-strain quasi-static contact analysis using the finite element method in Ansys Workbench software is used. The advantage is, among other things, a good comparability of results. The input to the FEM analysis is 3D CAD geometry – in this case, it is specifically a helical gear pair with parallel axes. The model/assembly of this gear pair is created in PTC Creo software fully parametrically, so it is possible to generate arbitrary gear pair configurations by changing the input parameters, which significantly saves time. At the end of this diploma thesis, the stress-strain analysis of various gear configurations is evaluated, with respect to the equivalent stress and contact pressure. Furthermore, the static transmission error – its graphs and peak-to-peak values – is determined from FEM analyses for different gear geometry, including tooth modifications, and for various loading torques. Last but not least, the effects of contact/overlap ratio and centre distance are evaluated.
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Berglund, Courtney L. "Robust Parameterization Schema for CAx Master Models." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2322.pdf.
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Engström, Henrik, and Jens Raine. "Finite Element based Parametric Studies of a Truck Cab subjected to the Swedish Pendulum Test." Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8318.
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<p>Scania has a policy to attain a high crashworthiness standard and their trucks have to conform to Swedish cab safety standards. The main objective of this thesis is to clarify which parameter variations, present during the second part of the Swedish cab crashworthiness test on a Scania R-series cab, that have significance on the intrusion response. An LS-DYNA FE-model of the test case is analysed where parameter variations are introduced through the use of the probabilistic analysis tool LS-OPT.</p><p>Example of analysed variations are the sheet thickness variation as well as the material variations such as stress-strain curve of the structural components, but also variations in the test setup such as the pendulum velocity and angle of approach on impact are taken into account. The effect of including the component forming in the analysis is investigated, where the variations on the material parameters are implemented prior to the forming. An additional objective is to analyse the influence of simulation and model dependent variations and weigh their respective effect on intrusion with the above stated physical variations.</p><p>A submodel is created due to the necessity to speed up the simulations since the numerous parameter variations yield a large number of different designs, resulting in multiple analyses.</p><p>Important structural component sensitivities are taken from the results and should be used as a pointer where to focus the attention when trying to increase the robustness of the cab. Also, the results show that the placement of the pendulum in the y direction (sideways seen from the driver perspective) is the most significant physical parameter variation during the Swedish pendulum test. It is concluded that to be able to achieve a fair comparison of the structural performance from repeated crash testing, this pendulum variation must be kept to a minimum. </p><p>Simulation and model dependent parameters in general showed to have large effects on the intrusion. It is concluded that further investigations on individual simulation or model dependent parameters should be performed to establish which description to use. </p><p>Mapping material effects from the forming simulation into the crash model gave a slight stiffer response compared to the mean pre-stretch approximations currently used by Scania. This is still however a significant result considering that Scanias approximations also included bake hardening effects from the painting process. </p>
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Albertson, Philip. "WBD – Web Based Diagnostics : Identifierande av parametrar på CAN-bussen." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1720.
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<p>Denna rapport beskriver ett examensarbete för högskoleingenjörsexamen i datorteknik vid Växjö universitet, utfört av Philip Albertson. Vid företaget BSR i Växjö pågår utvecklingen av en ny teknik benämnd Web Based Diagnostics. Målet med projektet är att göra fordonsdiagnostik tillgängligt för bilägare till ett bra pris. Systemet består av tre delar; en modul som sätts i bilen, en server som hanterar informationen och en klient för att kunden ska kunna nå informationen. Min del i detta projekt var att identifiera hur sökta parametrar nås på CAN-bussen i bilar från VAG (Volkswagen Auto Group) och Saab. Företagets representanter var nöjda med resultatet då det utgör en bra grund för vidareutvecklingen av den prototyp för modulen som utvecklats av EDAB (Elektronik Design AB) i Sundsvall.</p><br><p>This abstract describes the bachelor degree thesis in computer technology at Växjö University written by Philip Albertson during the spring term of 2007. At the company BSR in Växjö, Sweden there is a new project under development called WBD – Web based diagnostics. The aim of the project is to make car diagnostics available to ordinary people at a decent cost. The system consists of three parts; a module to plug in the car, a server to handle the information and a client to allow the customers to reach the information about their car. My part in this project was to specify how to reach certain parameters on the CAN-bus in cars from VAG (Volkswagen Auto Group) and Saab. The company was satisfied with the results since they provided a good basis to further develop the module prototype built by the company EDAB (Elektronik Design AB) in Sundsvall, Sweden.</p>
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Nicolai, Massimo. "Simulazione CAD dell'impingement articolare con protesi d'anca convenzionale e a conservazione di collo in funzione dei principali parametri chirurgici e anatomici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3756/.
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Lo scopo del lavoro è quello di verificare tramite software CAD l’influenza dei principali parametri chirurgici e anatomici sul Range Of Motion (ROM).
Sono stati costruiti 5 modelli, uno di articolazione sana(Senza Protesi), uno di protesi Convenzionale e tre di protesi Conservative o a Conservazione (Totale, Media e Bassa Conservazione).
Per tutti i modelli sono state simulate le rotazioni di base e i cosiddetti movimenti critici, ovvero quei movimenti a rischio di lussazione.
Le prove sono state eseguite per teste da 28-,32-,36-,40mm di diametro, e con la coppa orientata di 45° in abduzione e 15° gradi in antiversione prima e successivamente di 45° e 0°.
Inoltre, per verificare l’influenza dell’offset sul ROM, sono stati costruiti e simulati i movimenti per altri 5 modelli che non conservassero il vincolo del mantenere l’offset anatomico.
Variando il diametro della testa si registrano differenze apprezzabili in termini di ROM solo per i movimenti di Estensione e Abduzione per il modello di Protesi Convenzionale e di Abduzione per il modello a Bassa Conservazione.
Variando il livello di resezione del collo si è visto come per i modelli di protesi a Media Conservazione, Bassa Conservazione e Convenzionale si misurano angoli superiori a quello del riferimento tratto dalla Letteratura. Diversamente per il modello di Protesi a Totale Conservazione i valori ottenuti per alcuni movimenti sono inferiori, poiché limitati da un contatto di tipo c-b.
Le simulazioni dei movimenti critici confermano la tendenza di un ROM accettabile per i modelli di protesi a Bassa Conservazione e di protesi Convenzionale, i quali forniscono escursioni angolari sempre superiori a quelle prese come riferimento dalla Letteratura. Invece, le protesi a Totale e Media Conservazione forniscono valori inferiori al riferimento per i movimenti di Pivot e Roll, essendo limitati dall’antiversione della coppa (movimenti di ExtraRotazione e contatto c-b).
Variando la posizione della coppa a 45°/0° i due movimenti Critici Pivot e Roll migliorano per i modelli a Totale e Media Conservazione, tornando in linea con il riferimento.
Riguardo l’offset si nota come più si avvicina a quello anatomico che misura 46,2mm (da 37 a 44mm), più si riscontra un aumento in termini di ROM.
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Rezende, Rodrigo Alvarenga. "Analise de parametros fisicos e operacionais no fenomeno da cura localizada do processo termolitografico da prototipagem rapida." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266294.
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Orientador: Rubens Maciel Filho<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-09T08:31:02Z (GMT). No. of bitstreams: 1
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Previous issue date: 2006<br>Resumo: A Prototipagem Rápida consiste na reprodução física de objetos tridimensionais de geometria livre, a partir de um projeto inicial (design), modelado por auxílio de computador. A Prototipagem Rápida é uma tecnologia moderna que une métodos e equipamentos adequados a fim de oferecer, como principais atrativos, alta qualidade e redução de custos de produtos manufaturados. São diversos os métodos existentes e os materiais aplicáveis. Este trabalho apresenta um novo método de fabricação de protótipos, a Termolitografia. Baseada na irradiação de laser de CO2 na região espectral do
infravermelho sobre resinas termossensíveis, a Termolitografia oferece importantes vantagens quando comparada a outros processos, principalmente no que se refere ao estado físico da amostra logo após a irradiação do laser. Este processo apresenta duas grandes vantagens que são a não-contração da amostra após ser curada e a ausência de tratamento
pós-cura. A cura localizada é o fenômeno de confinamento da energia transmitida pelo laser realizando a cura do material somente em uma região desejada. O controle da cura localizada é a chave para o sucesso e para a garantia de protótipos de alta qualidade. Para ajustá-la e otimizá-la, é necessário o domínio de parâmetros físicos do material empregado
e de parâmetros operacionais do laser de CO2. O estudo da combinação dos efeitos, por exemplo, da variação da proporção dos componentes da amostra, da sua temperatura de cura, além de fatores operacionais como a velocidade de varredura, o diâmetro e a potência do feixe laser, é o alvo principal deste trabalho. As simulações facilitam a compreensão de
como cada variável pode interferir na construção do protótipo, e determinam faixas de valores para os parâmetros as quais implicam em melhores resultados no final do processo. O trabalho de seleção destes valores é importante para a futura continuidade de estudo experimental do processo termolitográfico<br>Abstract: Rapid Prototyping consists on a physical replication of three-dimensional objects with free geometry, from an initial design, modeled by computer assistance. Rapid Prototyping is a modern technology that unifies methods and suited equipments in order to offer as main attractive high quality and cost-reduction of manufactured products. There are many
techniques and raw materials applicable. This work presents a new method of prototypes fabrication, the Termolithography. Based on CO2 laser irradiation at the infrared spectral region onto thermosensitive resins, Thermolithography offers important advantages if compared with other processes, mainly those ones respected to the non-contraction effect of
the sample after being cured and the absence of a post cure treatment. The localized cure is the phenomenon of confinement of energy transmitted by laser beam performing the curing only on a desired region at the sample. The control of the localized cure is the key for the success and for the guarantee of high quality prototypes. In order to fit and optimize it, it is
necessary the domain of physical properties of the applied material and the domain of the CO2 laser operational parameters. The study of combination of the involved effects, for instance, the variation of amount of the components in the sample, the cure temperature, beside operational parameters as scanning velocity, the laser beam diameter and power, are the main target of this work. Simulations become easier the comprehension of how each variable can affect during the building of prototype and to determine the best range of values which implicate in better final result of the process. The selection of these values is
very important to the continuity of this work<br>Mestrado<br>Desenvolvimento de Processos Químicos<br>Mestre em Engenharia Química