Дисертації з теми "Manufacturabilité"
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1
Wang, Zhiping. "Constructive generative design methods for qualified additive manufacturing." Thesis, Ecole centrale de Nantes, 2021. https://tel.archives-ouvertes.fr/tel-03670417.
Анотація:
Les technologies de fabrication additive (FA) donnent de plus en plus de liberté de conception aux concepteurs et aux ingénieurs pour concevoir et définir des géométries et des compositions de matériaux très complexes. En raison d'un traitement couche par couche, les contraintes, méthodes, outils et processus de conception en FA sont différents de ceux des processus de fabrication traditionnels. Les méthodes et outils de conception traditionnels ne peuvent pas répondre aux besoins de la conception en FA. Par conséquent, un nouveau domaine de recherche, la conception pour la FA (Design for AM - DfAM), a émergé pour répondre à ce besoin. Cependant, les méthodes de DfAM existantes sont soit des lignes directrices, soit des outils de calculs, qui ont une prise en compte limitée des contraintes couplées le long de la chaîne de traitement numérique de la FA et peinent à garantir la fabricabilité de la conception en FA. Pour contribuer à l’obtention d’une conception qualifiée en FA, ce travail de thèse se concentre sur trois problèmes existants typiques dans le domaine du DfAM : premièrement, com-ment assurer la fabricabilité dans le processus d’optimisation topologique ? Deuxièmement, comment concevoir des structures de supports allégées, faciles à retirer pour le post-traitement et de diffusion de chaleur conviviales pour assurer la précision de la forme et améliorer la rugosité de surface des pièces imprimées ? Enfin, comment éviter les pertes de précision lors de la préparation de l'impression de structures en treillis complexes et assurer leur fabricabilité lors de la conception ?Pour résoudre les trois problèmes identifiés, ce travail de thèse propose un ensemble de nouvelles méthodes de conception générative constructive : 1. Méthode de conception générative basée sur un modèle CSG pour assurer la fabricabilité dans l'optimisation de la topologie de la structure allégée ; 2. Méthode de conception générative constructive basée sur des modèles pour optimiser la conception de la structure de supports et 3. Conception constructive inversée basée sur les « parcours d'outils » pour obtenir directement des modèles de traitement de structures poreuses ou de réseaux complexes correspondants avec des « parcours d'outils » pour obtenir directement des modèles de traitement de structures poreuses ou de réseaux complexes correspondants avec des « parcours d'outils » d'impression qualifiés. Les trois méthodes proposées intègrent les contraintes de processus de FA, réalisent un contrôle paramétrique et économisent des coûts de calcul dans le processus de conception pour obtenir un ensemble de solutions de conception candidates avec une fabrication garantie. Un ensemble d'études comparatives avec les méthodes DfAM existantes et quelques études de cas expérimentaux dans des applications médicales ont démontré les avantages des méthodes proposées. Ces méthodes constructives peuvent avoir un grand potentiel d'application pour être adoptées comme outils de conception et de prise de décision pour d'autres applications industrielles lorsqu'un DfAM qualifié est requisAdditive manufacturing (AM) technologies give more and more design freedom to designers and engi-neers to design and define highly complex geometries and material compositions. Due to a layer-by-layer processing, the constraints, methods, tools and processes of design in AM are different from that in traditional manufacturing processes. Traditional design methods and tools cannot meet the needs of design in AM. Therefore, a new re-search field, design for AM (DfAM), has emerged to serve this need. However, existing DfAM methods are either guidelines or pure computation-based, which have limited consideration of coupled constraints along the AM digital processing chain and are difficult to ensure manufactura-bility of design in AM. To obtain qualified design in AM, this research focuses on three typical existing problems in DfAM domain: Firstly, how to ensure manufacturability in (topology optimization) TO process? Secondly, how to design support structures with lightweight, easy-to-remove for post-processing and friendly heat-diffusion properties to ensure shape accuracy and improve surface roughness of printed parts? Finally, how to avoid accuracy loss in print-ing preparation of complex lattice structures and ensure their manufacturability in design?To solve the three identified problems, this research developed a set of new constructive genera-tive design methods: 1. CSG-based generative design method to ensure manufacturability in light-weight topology optimization; 2. Pattern-based constructive generative design method to optimize support structure design and 3. Toolpath-based inversed constructive design to directly ob-tain processing models of corresponding complex lattice or porous structures with qualified print-ing toolpaths. The three proposed methods can well embed AM process constraints, realize para-metric control and save computation cost in design process to obtain a set of candidate design solutions with ensured manufacturability. A set of comparison studies with existing DfAM meth-ods and a couple of experiment case studies in medical applications demonstrated the methods’ advantages. These constructive methods may have large application potential to be adopted as design and decision making tools for other industrial applications when qualified DfAM is required
2
Nowack, Mark Lorenz. "Design guideline support for manufacturability." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/251628.
Анотація:
Matching the configuration of a product to available production capabilities during the design process directly affects product cost and hence product competitiveness. Existing approaches to improving manufacturability are helpful in the latter stages of the design process and usually involve corrective redesign. To avoid redesign, designers require appropriate guidance in the early stages of the design process. Guidelines, that is prescriptive recommendations for actions to address issues, are frequently used to provide this guidance. However, guideline sets are often poorly structured, incomplete, and the guidelines difficult to retrieve and apply. The overall aim of this research is to improve guidance to designers, particularly manufacturability guidance, early in the design process. Particular objectives of this research are to improve existing methods of guideline collection, storage, and retrieval. The research proceeded in the following pattern: - Case studies explored manufacturability problems in a small company. - Guideline support concepts were developed using a retrospective case study. - Collection concepts were developed with observational studies. - Storage approaches were developed using advanced composite guidelines. - A link-based retrieval technique was validated with a mechanical design protocol study. - Collection, storage, and retrieval methods were empirically tested. The results of this research were: - a technique to directly relate guidelines to the design process - a system of links relating guidelines to each other - an Action-Centred Guideline Approach - a preliminary software implementation of the approach - validation of the utility of the approach. The conclusions from this research are: - Guidance in the early stages of the design process can be improved through the use of structured guidelines. - The Action-Centred Guideline Approach improves the collection, storage, and retrieval of guidelines. - Empirical validation showed that guideline links are an effective means for improving guideline retrieval. - Further research is required in the areas of integrating the approach with other design tools, and in extending the link technique.
3
Pons, Solé Marc. "Layout regularity for design and manufacturability." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/96983.
Анотація:
In nowadays nanometer technology nodes, the semiconductor industry has to deal with the new challenges associated to technology scaling. On one hand, process developers face increasing manufacturing cost and variability, but also decreasing manufacturing yield. On the other hand, circuit designers and electronic design automation (EDA) developers have to reduce design turnaround time and provide the tools to cope with increasing design complexity and reduce the time-to-market. In this scenario, closer collaboration between all the actors involved is required. New approaches considering both design and manufacturing need to be explored. These are the so called design for manufacturability (DFM) techniques.
A DFM trend that is becoming dominant is to make circuit layouts more regular and repetitive. The regular layout fabrics are based on the configuration of a simplied mask set, therefore reducing the manufacturing cost. Moreover, a reduced number of layout patterns is used, allowing better process variability control and optimization. Hence, regularity reduces layout complexity and therefore design complexity, allowing faster time-to-market.
In this thesis, we explore forcing maximum layout regularity focusing on future technology nodes, with increasing design and manufacturability issues, where we expect layout regularity to be mandatory. With this objective, we have developed a new regular layout fabric called Via-Configurable Transistor Array (VCTA). The physical design is fully explained involving layout and geometrical considerations for transistors and interconnects.
Initially, VCTA layouts developed manually have been evaluated in terms of manufacturability, but also in terms of area, energy and delay. For digital design, 32-bit binary adders designed with VCTA have been compared to standard cell layouts. For analog design, a delay-locked loop design using VCTA has been compared to its full custom version.
We have also developed a physical synthesis tool that allows us to obtain VCTA circuit layouts in an automated way. Developing our own automation tool lets us controlling all the decisions made during the physical design flow to ensure that maximum layout regularity is respected. In this case the work is based on several algorithms, for instance for routing, that we have oriented to the area optimization of the layouts.
Finally, in order to demonstrate the benefits of layout regularity, we have proposed a new layout regularity metric called Fixed Origin Corner Square Inspection (FOCSI). It is based on the geometrical inspection of the patterns in the layouts and it allows designers to compare regularity of designs but also how their regularity will impact their manufacturability. The FOCSI layout analysis tool can be used to optimize manufacturability.
4
Shiau, Yea-Jou. "Web-enabled environment for manufacturability assessment." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367157.
5
Ren, Feng. "STL toolkit-a manufacturability evaluation environment /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487953567771012.
6
Li, Ye. "Manufacturability analysis for non-feature-based objects." [Ames, Iowa : Iowa State University], 2008.
7
Lee, Mern Keat. "Design for manufacturability of speed-reduction cam mechanisms." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31056.
Анотація:
Cam mechanisms are widely used in industry, in applications requiring quick-return and indexing motions. A current research effort at the Robotic Mechanical Systems Laboratory of McGill University's Centre for Intelligent Machines aims at the application of cam mechanisms as speed reducers. The accuracy required in these mechanisms is of the utmost importance, especially when cams are rotating at a high speed.In this thesis, the design for manufacturability of planar speed-reduction cam mechanisms is studied. In particular, the thesis focuses on a speed reducer with a rotating follower to couple shafts of parallel axes, termed planar Speed-o-Cam. Principles of the design for manufacturability are applied to Speed-o-Cam and a unified method for obtaining the optimum parameters satisfying the curvature constraints and pressure-angle bounds is developed. These two factors are relatively important because Numerically Controlled and Computer Numerically Controlled machine tools could be very sensitive to changes of curvature of the workpiece, especially when milling complex shapes such as those of cam plates.
Cam-mechanism balancing is also studied because unbalance in a high-speed rotating element can cause severe vibrations and greatly affect the bearings and hence, the performance of the machine. This is done by not only adding counterweights, which unavoidably increase the weight and volume of the mechanism, but also by removing material.
8
Medani, Omar. "Distributed manufacturability assessment using STEP AP224 and XML." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418968.
9
Xu, Xu. "Optimizations of manufacturability and manufacturing in nanometer-era VLSI." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3219776.
Анотація:
Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed July 24, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 125-129).
10
Dechu, Sandeep. "Design for manufacturability and reliability of threshold logic gates /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1240704171&sid=23&Fmt=2&clientId=1509&RQT=309&VName=PQD.
11
Bonam, Ravi Kiran. "Asynchronous nanowire crossbar architecture for manufacturability, modularity and robustness." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Bonam_09007dcc804d89fd.pdf.
Анотація:
Thesis (M.S.)--Missouri University of Science and Technology, 2008.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 28, 2008) Includes bibliographical references.
12
Jacquel, Dominique. "Design for manufacturability : a feature-based agent-driven approach." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/12212.
Анотація:
This thesis presents a feature-based design system called MADSfm (MultiAgent Design System for manufacturability), which allows the creation of 21/2D mechanical components, performs on the fly manufacturability analysis and even solves common problems automatically. The system uses the multiagent paradigm at a feature level to create a new type of active product model. Indeed, each feature inside the product model is embodied by an autonomous agent capable of communicating with its peers, building an image of its world, assessing its fitness in this world and modifying its own geometry to guarantee its manufacturability. The model therefore becomes a community of motivated pro-active agents able to carry out simple tasks on behalf on the user. The underlying activity inside the agent community representing the model leads to a global emergent behaviour in the system that ensures component manufacturability. In turn the emergent behaviour allows a reduction of the amount of global component knowledge needed to perform manufacturability analysis. Most activity can take place locally for each individual feature making the approach robust and a good candidate for parallelisation and distribution. The agent-driven approach to feature-based design and manufacturability analysis ensures robust manufacturable designs with a shorter lead time bringing substantial cost savings.
13
Terry, Andrew Merrill 1970. "Improving product manufacturability through the integrated use of statistics." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88859.
Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; in conjunction with the Leaders for Manufacturing Program at the Massachusetts Institute of Technology, 2000.Includes bibliographical references (p. 73).
by Andrew Merrill Terry.
S.M.
14
Zuo, Dingli. "Manufacturability of circuits based on resonant (interband) tunnelling diodes." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648793.
15
Cronin, Harry M. "Manufacturability aspects of printable electronics and halide perovskite photovoltaics." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845680/.
Анотація:
Manufacturing electronic devices by printing or coating is a key emerging technology, promising low cost and high throughput. Halide perovskites have emerged as high efficiency, solution processable photovoltaic materials, and within this thesis some of the issues relevant to their up-scaling are explored. Additionally, photo-curing – a post-processing technique with a wide range of applications in printed electronics – is investigated. Aqueous silver flake inks are a promising material for printed conductive applications, combining low cost and high conductivity. Within this thesis, photo-curing of these inks to further improve their conductivity is investigated. Photo-cured samples showed an 11x conductivity improvement compared with thermally cured samples. Furthermore, the manufacturing yield was doubled following photo-curing. These novel observations are explained, by recourse to percolation theory, by an increase in mean particle size. These results enable lower cost and increased yield in future manufacturing. Halide perovskite materials show great promise for solution processable photovoltaics. Within this thesis, the effects of ambient conditions during device processing are measured, in order to inform future up-scaled manufacturing. The chemical and morphological effects of ambient humidity in perovskite films are correlated with the annealing time used and final device performance. This work led to new insights into the combined effects of these two parameters, and a suggestion is made for reducing the annealing time. Finally, a barrier to commercialisation of perovskite solar cells is the use of toxic solvents in their fabrication. Within this thesis, a novel deposition technique is proposed, based on the synthesis of perovskite material in particulate form followed by re-dispersal in non-toxic solvents. This mitigates solvent toxicity, reduces sensitivity to ambient conditions, and in some cases enhances stability. Devices are fabricated based on this technique, and though performance remains low, a marked improvement is observed by the addition of conductive graphene flakes to the inks.
16
Tamošauskas, Aurimas. "DFM (Design for Manufacturability) metodo taikymas gaminiams iš plastiko gaminti." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080929_135929-29173.
Анотація:
Šis ištirtas DFM metodas padeda atkreipti projektuotojų dėmesį į tas presuojamojo liejimo formavimo ypatybes, kurios yra linkusios didinti gaminio apdirbimo sąnaudas. Tyrime naudojame „šešių laipsnių koduojančia sistema“ tam, kad nustatyti galutines preliminarias ruošinio apdirbimo sąnaudas. Čia pabrėžiamos tos ypatybes, kurios žymiai didina kainą, kad projektuotojai galėtų sumažinti gaminamos detalės sudėtingumą. Naudojant pristatytą metodologiją, projektuotojai gali įvykdyti ruošinių apdirbimo sąnaudų įvertinimą ankstyvojoje konstravimo stadijoje. Tai gali būti įvikdyta pasitelkiant jų apytiksle vieta ir orientacija. Išsamūs matmenys nėra būtini. Metodologija parodo tai, ką detalių charakteristikos įtakoja kainai, kad pagerintų perkonstruotą detalę.The master’s thesis present the rewiew of design manufacture method. Mechanical part design plays an important role whether company will succeed in market or will fail. From my point of view there are three main measures of the DFM (Design For Manufacture) process: cost, quality and time, which are pivotal in design process. Regardless of the product being designed – whether it is an entire system or some small subpart of a larger product - the customer and management always want it cheaper, better and faster. In this project has described a systematic approach for calling designers attention to those features of injection molding that tend to increase the tooling cost to manufacture parts – and for estimating the relative costs of tooling. The system employs a six – digit coding system for determining total relative tooling cost, which groups parts according to their similarity in tool construction difficulty. The system highlight those features that significantly increase cost so that designers can minimize difficult – to – produce features.
17
Kenney, James Stevenson. "Modeling heterostructure acoustic charge transport devics for perfomance and manufacturability." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/13900.
18
Gurcan, Zeki B. "0.18 [mu]m high performance CMOS process optimization for manufacturability /." Online version of thesis, 2005. http://hdl.handle.net/1850/5197.
19
Mowchenko, Murray Allan. "Intelligent independent features, manufacturing features which ensure their own manufacturability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq20878.pdf.
20
Ockey, Rachelle Deanne. "Analysis of manufacturability factors for analog CMOS ADC building blocks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0023/MQ51437.pdf.
21
Marquez, Robledo Miguel A. "Development of a manufacturability analysis system for reinforced plastics components." Thesis, Middlesex University, 2001. http://eprints.mdx.ac.uk/6555/.
Анотація:
This thesis describes the research and development of a systematic and consistent methodology to perform manufacturability analysis of Reinforced Plastic Parts (RPP). The proposed methodology evaluates the part model in the early stages of the product development process considering the capabilities and constraints of available manufacturing processes, materials and tooling required in standard RPP production. Critical Manufacturing Part Features (CMPF) are identified and the relationship between the model's geometrical information, the expert's geometric reasoning, and the knowledge about the involved manufacturing processes are clarified and set together in an efficient feature-rule-based manufacturability analysis system. The prototype system named 'FEBAMAPP', combines solid modelling (SM), automatic feature recognition (AFR), object oriented programming (OOP), and a rule-based system (RBS) in order to assess the manufacturability of the proposed design. The novelty of this research is based in the use of a Face Vector (FVector) concept to transform geometrical and topological information of the solid model into a suitable input data to be used in the Neural Network Feature Recognition System. Further novelty arises from the fact that this is the first attempt to use neural networks in the recognition of 3-D features in hollow parts including the presence of fillets along the edges of the part. The manufacturability evaluation can be performed considering different combinations of materials along with different manufacturing processes giving the designer the opportunity of selecting an appropriate combination for any specific application. Promising results have been obtained during the test of the system, where 100 % recognition of trained features with 90% confidence has been achieved. Also, good results have been obtained in the recognition of non-trained features such as the Cross-Slot feature, which is recognised as a Slot feature. After automatic feature recognition, Manufacturability Analysis is focused on internal and external characteristics of the model's features, where potential manufacturing difficulties are identified and feedback in terms of design suggestions is then used to advise the design process and improve the overall manufacturability of the part. This manufacturability evaluation in terms of internal and external characteristics of the features has proved to be efficient in detecting detailed design errors that can be costly in further manufacturing stages in the product development process.
22
Abdul, Shukor Syaimak. "The development of a manufacturability analysis system for micro-milling." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11835/.
Анотація:
Manufacturability analysis systems (MASs) have been developed to enable the evaluation of manufacturability aspects during the design stage. MASs have been shown to be useful for macro-manufacturing processes but less attention or effort has been put for their development in the scope of micro-manufacturing. This thesis describes the development of a MAS for a micro-machining domain (MicroMAS) with a custom-made 4-axis Miniature Machine Tool (MMT) being the scope of implementation. There are three important components in this study which are; MAS, Uncertainty Evaluation Model (UEM) and micro-milling experiments. The integration between the results from the UEM analysis and micro-machining experiments were being incorporated into the MicroMAS to provide the system with the real condition of the MMT. In MicroMAS, Primitive Feature Analysis (PFA) is introduced as a new technique in gathering information from a CAD model and analysing its manufacturability. The results from the manufacturability assessment in MicroMAS are successfully achieved through the manufacturability index which indicates the relative ease of machining the CAD model and list of related suggestions. UEM is developed to analyse the influence of the errors stemmed from the MMT construction on the geometrical accuracy of the machined micro-parts. The model has allowed a methodology for the errors in a custom-made machine tool to be predicted and to further understand the origin of the errors on the machined micro-part (either from the machine or the process itself). The abilities of the MMT are evaluated through various types of experiments where the surface quality and geometrical accuracy can be concluded to be at an acceptable range. From the experience gained from the research, the development of MicroMAS for micro-milling has been found to be practical in assisting a user to generate micro-parts using the MMT.
23
Doppalapudi, Ranjeeth. "Design-for-manufacturability (DFM) for system-in-package (SiP) applications." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26701.
Анотація:
Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.Committee Chair: Dr. Swaminathan, Madhavan; Committee Member: Dr. Chatterjee, Abhijit; Committee Member: Dr. Lim, Sungkyu. Part of the SMARTech Electronic Thesis and Dissertation Collection.
24
Gazor, Mehdi (Seyed Mehdi). "Design for manufacturability with regular fabrics in digital integrated circuits." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34108.
Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (p. 113-115).
Integrated circuit design is limited by manufacturability. As devices scale down, sensitivity to process variation increases dramatically, making design for manufacturability a critical concern. Designers must identify the designs that generate the least systematic process variation, e.g., from pattern dependent effects, but must also build circuits that are robust to the remaining process or environmental random variations. This research addresses both ideas, by examining integrated circuit design styles and aspects that can help curb process variation and improve manufacturability and performance in future technology generations. One suggested method to reduce variation sensitivity in system designs has been the concept of design regularity. Long used in FPGAs, and SRAMs, the concept of repeatable blocks is examined in this work as a method of reducing circuit variation. Layout based variation is examined in three designs with different distinctions of regularity: a Via-Patterned Gate Array (VPGA) FPU, a Berkeley BEE-generated decoder, and a low power FPGA. The circuit level impact on variation is also considered, by examining several circuit architectures. This includes analysis of the novel Limited Switch Dynamic Logic (LSDL) style, which reduces design area and encourages regularity through minimum logic sizing.
(cont.) Robustness to spatial variation and slanted plane effects is examined with a common-centroid based layout methodology for digital integrated circuits. Finally, a methodology is introduced in the form of the Monte Carlo Variation Analysis Engine whereby distributed process variables are fed into repeated simulation runs, output metrics are recorded, and regressions are measured to expose design sensitivities. The results for different layout and circuit design styles identify improvements that may be made to improve robustness to variation. We show that design regularity is a significant factor in mitigating sensitivity to process variation and is worthy of further examination.
by Mehdi Gazor.
S.M.
25
Brown, Christopher P. (Christopher Perry). "Design for manufacturability of a high-performance induction motor rotor." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38170.
26
Cole, Thomas J. (Thomas Jonathan). "Manufacturability of microcellular foamed plastics : design of gas-addition device." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13058.
27
Bracher, Christopher David. "The stability and manufacturability of emerging thin film photovoltaic technologies." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16446/.
Анотація:
In order for a photovoltaic device to be commercially viable it must have a production cost and operational stability commensurate with its final application. Both of these properties are influenced by many factors, including the production of the active materials and the deposition techniques used to fabricate it. In this thesis, the stability and manufacturability of two emerging photovoltaic materials are examined: organic semiconducting polymers and organic-inorganic perovskites. Organic semiconducting polymers are commonly synthesised through reactions utilising metal catalysts, which can remain with the polymer after synthesis, necessitating the investigation of their influence on photovoltaic devices. This work shows that the presence of the residual catalyst palladium in PCDTBT organic photovoltaic (OPV) devices caused significant reductions in power conversion efficiency and an additional increase in efficiency loss during the first 60 hours of operation. It is also shown, however, that only minor losses occurred in PFD2TBT-8 OPV devices at high Pd concentrations, highlighting the need to examine individual material systems. Despite being a very new technology, perovskite solar cells (PSCs) have already achieved comparable performance to silicon solar cells, making it important to investigate the stability of such devices. The operational stability of PSCs in the inverted architecture was characterised, showing lifetimes of < 300 hours. Using spectroscopic and device characterisation techniques, the major loss mechanisms were revealed to be reactions with water and oxygen, resulting the in the decomposition of the perovskite. It is also examined how the addition of hydroiodic acid to the perovskite precursor solution affects the performance and stability of spin and spray coated PSCs. Finally, the effects of deposition temperature and additional annealing on the operational stability of PSCs was investigated.
28
Zhao, Ziwei. "Manufacturability and Performance of Nano Enhanced Fiber Reinforced Polymeric Composites." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417475800.
29
Miremont, Christophe. "Developments in manufacturability of ferroelectric liquid crystal on silicon microdisplays." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/15401.
Анотація:
Exploiting the advantageous properties of Ferroelectric Liquid Crystals (FLCs) in Liquid-Crystal-on-Silicon (LCoS) microdisplay devices has proved very challenging for several reasons. Means of controlling the small cell gap required for optimum electro-optical performance (typically around 0.8 µm) even across the small active area of such displays had to be developed. Improving the compatibility of the silicon chip with this particular liquid crystal configuration and its intrinsically high susceptibility to cosmetic defects was also required. This thesis presents some process development work aimed at solving these issues. An advanced post-processing procedure for the preparation of silicon backplanes relying on the use of chemical mechanical polishing (CMP) has been employed to prepare realistic sample surfaces for studying the resulting topography on the liquid crystal layer. A process sequence for producing integrated peripheral spacer structures on silicon backplanes is presented and its compatibility with ferroelectric liquid crystals assessed. The use of thin films deposited on the back of silicon wafers for flattening the silicon chip in order to improve the cell gap uniformity across the device was demonstrated. It is also shown that patterning of this stress compensation layer offers the possibility of controlling the symmetry of its flattening effect. Such option is advantageous in terms of the additional latitude it provides in terms of IC design.
30
Krishnan, Krishna Kumar. "Design for manufacturability methodology and data representation framework for machined components." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/37261.
Анотація:
The traditional product development process has been sequential in nature, with the product going through design, process planning, manufacturing and assembly. This sequential decision making results in increased costs and higher product development times. With the trend towards better product quality, product customization, shorter product life cycle, and international competition, manufacturers are faced with the challenge of improving product quality while reducing product development time, manufacturing lead-time, and product cost. To cope with these challenges, the product development process has to be made more efficient by integrating manufacturing and assembly considerations in the design phase itself, through the use of techniques such as Design For Manufacturability (DFM) and Design For Assembly (DFA).
DFM techniques have to be automated to take advantage of the vast advances in CAD and CAM systems. However, the automation of DFM has been constrained, especially for machined components, by the lack of methodologies which are dependent on the process of manufacture, and the incomplete part data representation in CAD systems. This research created a DFM methodology for machined components, along with an appropriate data representation scheme. Also, a software prototype was developed to demonstrate and validate both the methodology and the data structure.
The DFM methodology consists of three modules: DFM feasibility, process plan generation, and DFM analysis. The DFM feasibility module performs an initial feasibility check on the material, dimensions, tolerances, and configuration of the part. It also generates the spatial relationships between features. The process plan generation module uses a sequence identifier algorithm to generate the manufacturing sequence. The DFM analysis module evaluates tolerances relative to their stacking effects and manufacturability. It then analyzes the part configuration for possible design and process plan improvements.
A software prototype was developed using C++. It addresses the dimension checking, tolerance checking, configuration checking and spatial relationships generation in the DFM feasibility module. In the process plan generation module, the sequence of surfaces/features to be generated has been automated. This sequence is one of the major inputs to a computer-aided process planning module.
Other methodologies for non-machined components can be easily integrated into the DFM framework for complete automation of DFM analysis.Ph. D.
31
Riolo, Joseph S. "A Comparative Analysis of Genome Complexity and Manufacturability with Engineering Benchmarks." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627663196868138.
32
Sandberg, Marcus. "Knowledge enabled engineering design tools for manufacturability evaluation of jet engine components." Licentiate thesis, Luleå, 2005. http://epubl.luth.se/1402-1757/2005/16.
33
Albrecht, Katharina [Verfasser]. "Graph-based optimization for manufacturability of bifurcated sheet metal parts / Katharina Albrecht." Aachen : Shaker, 2017. http://d-nb.info/1149269650/34.
34
Gayretli, Ahmet. "An expert system for supporting design consistency based on design for manufacturability." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4211.
35
Linares, Rodrigo (Rodrigo Alfonso Linares Garcia). "Manufacturability of lab on a chip devices: tolerance analysis and requirements establishment." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62541.
Анотація:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 64-66).
Decisions made during the first stages of the design process can have an impact on the cost, quality and performance of a product. Variation in assemblies, if not managed correctly during the design stage, can have a negative impact on the success of the product. This work analyzes the Daktari CD4+ Cell Counter System's capability of meeting its requirements. A Variation Simulation Model was employed to anticipate any failure modes caused by manufacturing variation and to test the robustness of the design. The design was shown to be largely successful in its ability to deliver function but unexpected failure mechanisms were found. Design considerations in the system KCs were suggested in order to minimize the effect of variation and reduce the risk of failure.
by Rodrigo Linares.
M.Eng.
36
O'Flynn, Julian. "Design for manufacturability of a composite helicopter structure made by resin transfer moulding." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21940.
Анотація:
Resin transfer moulding (RTM) is a promising composite manufacturing method capable of producing high quality parts while meeting the rising demand for cost effectiveness. A collaborative research project involving academia, industry, and government in the Montreal area is under way to optimize RTM and help transfer this technology to local industries. As a technology demonstrator, the leading edge slat of the Bell 407 helicopter is being redesigned using composite materials and RTM. This thesis presents the mould design, part design for manufacturability, and actual production of half-length prototype parts. The mould and part designs were carried out concurrently taking into consideration results from stress analysis and flow modelling, as well as manufacturing constraints. A total of eight prototypes were manufactured. During the development of this project, important improvements were made in the way composite parts are manufactured by RTM. The lessons learned from this prototype design and manufacturing work will help to produce the full-size version of the slat as well as other components in the future.Le moulage par injection sur renfort (resin transfer moulding, RTM) est un procédé de fabrication prometteur, produisant des pièces en matériaux composites de haute qualité tout en ayant des coûts de production avantageux. Un projet de recherche incluant des collaborateurs du secteur académique, industriel, et gouvernemental dans la région de Montréal est en cours afin d'optimiser le procédé RTM et de faciliter le transfert de cette technologie aux industriels locaux. Pour démontrer cette technologie, le bec de bord d'attaque de l'hélicoptère Bell 407 est reconçu utilisant des matériaux composites fabriqué avec le procédé RTM. Cette thèse présente la conception du moule et de la pièce en fonction de la facilité de fabrication ainsi que de la production de prototypes demi-longueurs. Le moule et la pièce ont été conçus simultanément considérant les résultats des analyses de contraintes, d'écoulement de résine dans le renfort tout en tenant compte des contraintes pouvant être encourues lors de la fabrication. Huit prototypes demi-longueurs ont été fabriqués. L'expérience acquise lors de la conception et la fabrication du moule ainsi que des prototypes aideront à la production du bec de bord d'attaque pleine longueur en plus d'être utile lors de conceptions futures.
37
Gray, J. Michael (John Michael) 1978. "A unified approach to modeling, verifying, and improving the manufacturability of mechanical assemblies." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/16671.
Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 247-256).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
The goal of a design engineering organization is to design products that satisfy customers. Reaching this objective is dependent, among other things, on five parameters: the customer expectations, the target percentage of satisfied customers, the nominal performance of the design, the variability in the manufacturing processes, and the sensitivity of the design performance to such variability. This work presents a unified methodology that is amendable to computer implementation for modeling these five parameters for products that are primarily mechanical in nature. The validity of this methodology is subject to five major assumptions: the nominal performance of the design matches the performance expected by the customer, the set of customer expectations can be represented completely by a set of geometric relationships and tolerances between features in the assembly, the degradation in product performance is due solely to quantifiable variability or mean shift in the assembly geometry, the variability in each geometric relationship is independent of the variability in any other geometric relationship, and any compliant parts in the assembly can be accurately modeled as sets of rigid parts connected with linearly-compliant joints. The assembly model is developed using a combination of Screw Theory, Network Theory, Homogeneous Transformation Matrices, and Probability Theory. It is shown how this model can be used to verify the manufacturability of a mechanical assembly design. It is also shown how the model and the results obtained from it can be used to improve the level of manufacturability of a design if it is found to be unacceptably low. To validate the effectiveness and accuracy of the methodology, an automated version written for Matlab®
(cont.) was used to model and analyze the manufacturability of an engine valvetrain. The results of this case study are presented and compared to results using existing industry-standard tools. Several suggestions for improving the manufacturability of the valvetrain are also proposed and discussed.
by J. Michael Gray.
S.M.
38
Fears, Eric Sebastian. "An analysis of the effect of technology transfer methodology on manufacturability and sustainability." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12027.
Анотація:
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1994.Includes bibliographical references (p. 107-111).
by Eric Sebastian Fears.
M.S.
39
Dantale, Anish. "A Group Technology Based Approach for Application of Design for Manufacturability (DFM) Rules." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1455208900.
40
Lu, Shao-Chiung. "Volume-based geometric reasoning and visualization to support manufacturability evaluation in die casting /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487936356160039.
41
Mukherjee, Souvik. "Layout-level Circuit Sizing and Design-for-manufacturability Methods for Embedded RF Passive Circuits." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16131.
Анотація:
The emergence of multi-band communications standards, and the fast pace of the consumer electronics markets for wireless/cellular applications emphasize the need for fast design closure. In addition, there is a need for electronic product designers to collaborate with manufacturers, gain essential knowledge regarding the manufacturing facilities and the processes, and apply this knowledge during the design process. In this dissertation, efficient layout-level circuit sizing techniques, and methodologies for design-for-manufacturability have been investigated.
For cost-effective fabrication of RF modules on emerging technologies, there is a clear need for design cycle time reduction of passive and active RF modules. This is important since new technologies lack extensive design libraries and layout-level electromagnetic (EM) optimization of RF circuits become the major bottleneck for reduced design time. In addition, the design of multi-band RF circuits requires precise control of design specifications that are partially satisfied due to manufacturing variations, resulting in yield loss. In this work, a broadband modeling and a layout-level sizing technique for embedded inductors/capacitors in multilayer substrate has been presented. The methodology employs artificial neural networks to develop a neuro-model for the embedded passives. Secondly, a layout-level sizing technique for RF passive circuits with quasi-lumped embedded inductors and capacitors has been demonstrated. The sizing technique is based on the circuit augmentation technique and a linear optimization framework.
In addition, this dissertation presents a layout-level, multi-domain DFM methodology and yield optimization technique for RF circuits for SOP-based wireless applications. The proposed statistical analysis framework is based on layout segmentation, lumped element modeling, sensitivity analysis, and extraction of probability density functions using convolution methods. The statistical analysis takes into account the effect of thermo-mechanical stress and process variations that are incurred in batch fabrication. Yield enhancement and optimization methods based on joint probability functions and constraint-based convex programming has also been presented. The results in this work have been demonstrated to show good correlation with measurement data.
42
Li, Leihong. "Structural design of composite rotor blades with consideration of manufacturability, durability, and manufacturing uncertainties." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24757.
Анотація:
Thesis (Ph.D.)--Aerospace Engineering, Georgia Institute of Technology, 2009.Committee Chair: Hodges, Dewey H.; Committee Member: Bauchau, Olivier A.; Committee Member: Johnson, Ellis; Committee Member: Makeev, Andrew; Committee Member: Volovoi, Vitali V.
43
Klatten, Jan. "Case studies from the US auto market--the impact of product policy on manufacturability." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13389.
44
Lundberg, Ludvig. "Modular front lamp to a combat vehicle : With focus on modern design and manufacturability." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68947.
Анотація:
The purpose of the project is to, with the help of relevant course literature, knowledge obtained from previous courses and with the help of supervisor and colleagues, produce a concept suggestion of how the front lamp to a combat vehicle could be designed. The purpose is also, with the help of meticulous documentation and structured work, to do a project that it will possible to continue working on and eventually construct a prototype from. The methods that were used during this project were for example WBS, scrum board, Gantt-schedule and elimination matrix. The project started with a planning phase where the project plan and time schedules were set up. Then was the pilot study which is used to gather the knowledge needed to carry out the project. The information gathered in the pilot study were then summarized in a criterion matrix in the product specification. These criterions were then used in the concept selection phase as guidelines when generation ideas and develop concepts. After the concept selection three concept were chosen and presented for the employer and, in conjunction with the employer, it was decided to combine these concepts into one. 3D-models were then done with the help of CAD (Computer Aided Design) to illustrate this combined concept and associated material selection and manufacturing methods were done. The conclusion of this project was that the amount of innovative ideas and solutions were limited since the product is regulated by military standards and criterions from customers. Therefore, the outcome of the project is similar to previous versions, which is unfortunate, since the goal with the project were to come up with new and innovative concepts of how to design the front lamp. But even though this concepts design looks like the old design, it has few completely new things to it that haven’t existed in previous versions. It was also realized how much time you save during the project if you do a detailed planning at the start of the project and how valuable it is to be structured in the work process. Further work that is needed to be done on the project before the production of a prototype are calculations of the cost to manufacture and produce the product, strength calculations of the stress concentrations etc., and drawings of the product. The components of the front lamp, i.e. horn, lamps, sensors etc., also need to be selected in accordance with the criterion matrix.Syftet med detta projekt är att, med hjälp av relevant kurslitteraturer, kunskap från tidigare kurser och med hjälp och stöd av handledare och kollegor, ta fram ett konceptförslag på hur frontlyktan till ett stridsfordon skulle kunna bli designad. Syftet är också, med hjälp av noggrann dokumentation och strukturerat arbete, att göra ett projekt som det är möjligt att fortsätta arbeta på och till slut kunna producera en prototyp ifrån. Metoderna som används i detta projekt är till exempel WBS, scrum board, Gantt-schema och eliminationsmatris. Projektet började med en planeringsfas där projektplanen och tidsplaner var gjorda. Sen gjordes förstudien för att tillhandahålla tillräckligt mycket information för att kunna genomföra projektet. Denna information summerades sedan i en kriteriematris i produktspecifikationen. Dessa kriterier användes sedan som riktlinjer vid idégenerationen och vid utveckling av koncept i konceptfasen. Efter konceptfasen valdes tre koncept att presenteras för arbetsgivaren och, i samråd med arbetsgivaren, valdes det att kombinera dessa koncept till ett. 3D-modeller gjordes sedan i CAD (Computer Aided Design) på detta koncept för att illustrera konceptet. Materialval och tillverkningsmetoder valdes också. Slutsatsen av detta projekt är att det var begränsande att utveckla innovativa idéer och lösningar till denna produkt eftersom produkten var styrd av militärstandarder och kundkrav. På grund av detta blev resultatet av projektet likt tidigare versioner, vilket är olyckligt, då målet med projektet var att utveckla en nya och innovativa koncept på hur designen av frontlyktan skulle kunna vara. Trots att designen är snarlik tidigare versioner, så har ändå detta koncept vissa funktion som är helt nya för produkten. På slutet av projektet var det också tydligt hur viktigt det är att göra en detaljerad planering vid starten av projektet och hur värdefullt det är att vara strukturerad i sitt arbete. Fortsatt arbete som måste göras innan en prototyp kan tas fram är en kostnadsanalys, hållfasthetsberäkningar och ritningar på konceptet. De olika komponenterna i frontlyktan måste också väljas, i enlighet med kraven i kriteriematrisen.
45
Yueh, Yuh-Shan. "A systematic approach to support design for manufacturability in injection molding and die casting /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487929230741337.
46
Mhapsekar, Kunal Shekhar. "Design for Additive Manufacturing Based Topology Optimization and Manufacturability Algorithms for Improved Part Build." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535465547739089.
47
Sato, Yuki. "A structural design methodology based on multiobjective and manufacturing-oriented topology optimization." Kyoto University, 2019. http://hdl.handle.net/2433/242490.
48
Namvari, Kasra. "Manufacturability of lab-on-chip devices : dimensional variation analysis of electrode foils using visual technology." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69532.
Анотація:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 90-92).
Electrodes are necessary components for measuring changes in electrical properties in many microfluidic devices. Daktari CD4 Cell Counter system utilizes an interdigitated electrode foil in order to measure the concentration of the CD4 cells in an assay chamber by measuring the impedance drop. Thus the consistency in the dimensions of the interdigitated fingers in the electrode is critical to the repeatability of impedance measurements. This work involved a thorough variation analysis of the electrode dimensions to characterize the repeatability of the new manufacturing process developed by Daktari. For this purpose optical imaging was used to obtain high-resolution images of the electrodes and an algorithm was developed in order to estimate the critical dimensions of interdigitated fingers from the images. The results showed that the dimensional variation in the electrodes had insignificant effect on the performance of the electrodes and that the new manufacturing process is capable of producing satisfactory electrodes within the desired target. The relation between the electrode's dimensional variations was found and the effect of critical process parameters was determined in order to maintain the process statistically in control.
by Kasra Namvari.
M.Eng.
49
Fennell, Gregory E. (Gregory Edmund). "System design and manufacturability of concrete spheres for undersea pumped hydro energy or hydrocarbon storage." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67779.
Анотація:
Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 210-217).
Offshore wind and energy storage have both gained considerable attention in recent years as more wind turbine capacity is installed, less attractive/economical space remains for onshore wind, and load-leveling issues make integrating wind power into the existing electrical grid difficult. For depths greater than 50m, floating wind turbines are expected to be more economical than pylon-based wind turbines, In order for offshore wind energy to maintain a steady supply to the grid without excessive ramping-up and ramping-down of onshore, fossil-fueled power generation units and to reduce the cost of wind integration, some form of energy storage is required. The greater water depths in which floating wind turbines are located can provide an opportunity for a unique energy storage concept that takes advantage of the hydrostatic pressure at ocean depths to create a robust pumped energy storage device. Coupling this energy storage system with a floating wind farm provides a more consistent and predictable power plant that could ultimately lessen the cost of large-scale wind integration, consistently reduce fossil fuel use, and reduce greenhouse gas (GHG) emissions and load-level onshore generation. Additionally, the same type of device structure can be used for undersea hydrocarbon storage during periods of hurricane/tropical storm shut-in's at oil wellheads, maintaining wellhead production without risking personnel or environmental safety due to storm evacuations at the rigs on the surface.
by Gregory E. Fennell.
Nav.E.and S.M.
50
Lester, Mark Alan. "Design alternatives to improve consumer appeal and manufacturability of a water-filled teether for babies." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/69712.