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Dvorkin, William Nathan. "Applying the Principles of Project Management to a Collegiate Automotive Engineering Design Project". Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71328.
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The Hybrid Electric Vehicle Team of Virginia Tech is a collegiate automotive engineering design team that reengineers production vehicles to reduce environmental impact while maintaining vehicle marketability. The team Project Manager is responsible for coordinating high-level management and planning activities with the goal of better aligning the team with business and automotive industry practices. Project management responsibilities within the Hybrid Electric Vehicle Team are divided into four categories: human resource management, schedule management, cost management, and risk management. This document outlines how project management strategies were researched and adapted from industry practices for use by the Hybrid Electric Vehicle Team in achieving its goals.
The human resource management strategy adopts onboarding principles that better prepare new students to become effective team members. By restructuring the organization and incorporating onboarding strategies, annual turnover is reduced from 71% to 44%. The decrease in turnover is enabled by the successful creation of an independent study program which trains newcomers to become effective team members. The program can be improved for the future by further developing the curriculum.
The employed schedule management strategy develops the project schedule iteratively as technical information reveals itself through task progress. Utilizing this process makes schedule management possible in an environment with incomplete information and pressing deadlines. This strategy experienced limited success due to the lack of team and project scheduling experience on behalf of several key members of the process.
The cost management strategy is designed to gather detailed financial data to perform an earned-value analysis and create improved budgets. By understanding income and expense patterns, the Project Manager can create economic forecasts to determine the economic viability of the team. The strategy was successfully implemented and allowed the team to gather valuable financial data.
The risk management strategy identifies and quantifies technical risks associated with vehicle development. By focusing more resources on high-risk activities, the team can improve preparation for competition where the vehicle is judged according engineering quality and build progress. The strategy was successful because it identified critical hazards to the project schedule and scope, but can be improved by broadening the process to account for a wider variety of risks.Master of Science
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Deo, Hrishikesh V. "Axiomatic design of customizable automotive suspension systems". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38698.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2007.Includes bibliographical references (p. 195-201).
The design of existing suspension systems typically involves a compromise solution for the conflicting requirements of comfort and handling. For instance, cars need a soft suspension for better comfort, whereas a stiff suspension leads to better handling. Cars need high ground clearance on rough terrain, whereas a low center of gravity (CG) height is desired for swift cornering and dynamic stability at high speeds. It is advantageous to have low damping for low force transmission to vehicle frame, whereas high damping is desired for fast decay of oscillations. To eliminate these trade-offs, a novel design for a customizable automotive suspension system with independent control of stiffness, damping and ride-height is proposed in this thesis. This system is capable of providing the desired performance depending on user preference, vehicle speed, road conditions and maneuvering inputs. The design, fabrication and control of the customizable suspension prototype are discussed. The application of variable stiffness and variable ride-height suspension system to achieve improved vehicle dynamics is studied. Application to control of vehicle dynamics parameters required bandwidth and power input beyond the capability of the first prototype.
(cont.) To eliminate the bandwidth restrictions of the prototype, a variable-stiffness pneumatic suspension system capable of instantaneous stiffness change with essentially no power input and no ride-height change, is developed. This is done by supporting the vehicle on air springs and connecting each air spring volume to multiple auxiliary volumes through On-Off valves. By adequately choosing N unequal auxiliary volumes, this system can achieve 2N stiffness settings. This suspension has been incorporated in a car suspension. The design, fabrication, and testing of the suspension system are reported in this thesis. A detailed frequency-domain model for the air-spring with auxiliary volumes is developed. Based on this modeling and testing, the performance limits and practical applicability of this system are discussed. The proposed variable stiffness isolator is capable of instantaneous stiffness change with no power input and no dimension change; moreover the isolator is inexpensive, robust and light. As a result, it is readily applicable to several other vibration isolation applications with conflicting stiffness requirements (such as a precision motion stages) or time-varying stiffness requirements (such as prosthetic limbs) and these applications are discussed.
by Hrishikesh V. Deo.
Ph.D.
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Fang, Xitian 1963 y Deming 1967 Wan. "Integrated automotive exhaust engineering : uncertainty management". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34631.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2006.Includes bibliographical references (p. 104-108).
The global automotive industry has entered a stagnating period. Automotive OEMs and their tier suppliers are struggling for business growth. One of the most important strategies is to improve the engineering efficiency in the product development process. The engineering uncertainties have been identified as the main obstacles in the Lean Engineering practices. This study will be focused on the engineering development process of ArvinMeritor Emission Technologies. The lean engineering principles and techniques are applied to the current product development process. The Value Stream Mapping and Analysis method is used to identify the information flow inside the current engineering process. Based on the value stream map, the uncertainties at various development stages in the process are identified. The Design Structure Matrix is used to identify any unplanned design iteration, which results in lower engineering efficiency. The House of Quality is used to prioritize the importance of the iterations. The suggested excel program can effectively evaluate the effect of task duration, probability, impact and learning curve assumption.
(cont.) In order to quantitatively predict the effects of the uncertainties, a System Dynamic model is specifically developed for the current engineering of Emission Technologies. The results clearly indicate the control factors for on-time delivery, efficient resource allocation, and cost reduction. This study has integrated the techniques from system engineering, system project management, and system dynamics. An improved automotive exhaust engineering process is proposed.
by Xitian Fang and Deming Wan.
S.M.
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Fonte, William Giacomo. "An automotive lower back seat system design". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/32140.
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Chopra, Vikram. "Design of innovative clutching mechanisms for hybrid automotive transmissions". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123009.
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Innovative clutching mechanisms for hybrid automotive transmissions that yield low losses, while still satisfying the conflicting requirements of compactness, quick response, and high power density are explored in this thesis. Moreover, a systematic approach to automotive-transmission clutch design is proposed. The goal is to provide a complementary tool to aid the designer's judgment. The various design variants chosen serve two purposes, to demonstrate the foundation and to showcase approaches and solutions to specific problems that have a direct application in transmission design. The analysis of design variants goes into sufficient depth to be useful to both practicing automotive design engineers and academics.The phenomenon of "spin loss" is well known in the automotive industry, for it affects all transmissions. One energy sink identified in this regard lies in traditional wet clutches and brakes, wherein an open clutch or, correspondingly, an open brake, creates drag on the transmission because of the oil churning around and between the rotating friction plates. A second source of spin loss, or energy sink, is of electromagnetic origin, as it occurs by virtue of spinning inactive motors that carry permanent magnets. Apart from spin losses, the hydraulic actuation of clutches and brakes suffers from head losses. Seals, pumps and valves incur leakages that cause energy loss.Using the techniques outlined in this thesis, two separate novel clutch variants are demonstrated to improve clutch and brake technology. One variant, the electromechanical clutch actuator, is based on a high-performance screw joint with a built-in locking mechanism. The screw joint was tested with two sub-variants, namely, a lead screw and a ball screw. One prototype of each of the two sub-variants was installed on a testbed, to mimic the installation of the actuator in place of the corresponding hydraulic components. To better reflect the elastostatic behaviour of the clutch disk assembly, a new model for its stiffness as a hardening spring was formulated. Proof-of-concept tests of both sub-variants, lead and ball screws, demonstrated their feasibility.The second variant, the electromagnetic dog clutch, is directly aimed at minimizing spin and hydraulic actuation losses for clutched electric motors, wherein the motor is connected to a clutch. The system includes a unique contactless electromagnetic synchronizer and a synchronizing sleeve with dog teeth on the input and output components. The design study, focused on the electromagnetic part, strives to reduce clutch slip and control torque. The novel design features claw-like stator and salient rotor poles with good machinability within a restrictive design volume. A complete design analysis with physical proof-of-concept testing was conducted.Reducing "spin-loss" in transmission assemblies will improve system efficiency and yield better fuel economy. The technologicalimpact will benefit not only the user, who will obtain more mileage for her or his dollar, but also the environment.Dans cette thèse sont étudiés des mécanismes innovants d'embrayage pour transmissions automobiles hybrides qui n'engendrent que de faibles pertes, tout en satisfaisant les besoins parfois conflictives de compacité, de haute vitesse de réaction et de haute densité d'énergie. Une approche systématique de la conception de transmissions automobiles est proposée, dont l'objectif est d'offrir un outil complémentaire au jugement du concepteur. Les divers alternatives choisises servent à présenter les concepts fondamentaux, ainsi qu'à mettre en valeur les différentes approches et solutions à des problèmes spécifiques qui ont une application directe dans le domaine des conceptions de transmissions. L'analyse d'alternatives de conception va suffisamment en profondeur pour être utile à la fois aux ingénieurs de conception automobile et aux théoriciens.Le phénomène de pertes d'énergie cinétique de rotation (PECR) est bien connu dans l'industrie automobile, car cela affecte toutes les transmissions. Un puits d'énergie mis en évidence à ce propos concerne les embrayages et freins traditionnels à fluides, pour lesquels un embrayage ouvert ou un frein ouvert, crée une traînée dans la transmission parce que l'huile tourbillonne autour et dans les plaques tournantes de friction. Un second puits d'énergie est d'origine électromagnétique, car générée par la rotation de moteurs inactifs contenant des aimants permanents. Hormis le PECR, l'actionnement hydraulique d'embrayages ou de freins entraîne des pertes de charges. Les joints, pompes et valves encourent des fuites qui engendrent de puits d'énergie.En utilisant les techniques mises en avant dans cette thèse, deux nouvelles alternatives d'embrayages démontrent leurs capacités à améliorer les technologies des freins et des embrayages. L'une de ces alternatives, l'actionneur {\em électromécanique d'embrayage}, est basée sur une liaison à vis et dispose d'un mécanisme intégré de verrouillage. La liaison à vis a été testée au travers de deux sous-alternatives, à savoir une vis à filet trapézoïdal et une vis à billes. Un prototype de chacune des alternatives a été installé sur un banc d'essai, afin de reproduire l'installation de l'actionneur en lieu et place des composants hydrauliques correspondants. Pour mieux refléter le comportement élastostatique de l'assemblage des disques d'embrayage, un nouveau modèle de sa raideur, assimilée à un ressort durcissant, a été formulé. Des tests de preuve de concept des deux variantes, vis à filet trapézoïdal et vis à billes, ont montré leur faisabilité.La seconde variante, l'embrayage électromagnétique à interférence, est directement utilisable pour minimiser les pertes en rotation et en actionnement hydraulique pour les moteurs électriques à embrayage, pour lesquels un moteur est connecté à un embrayage. Le système inclut un unique synchronisateur et des bagues de synchronisation avec des dents-de-chien sur les composants en entrée et en sortie. Le travail de conception a été concentré sur la partie électromagnétique, qui essaie de réduire le glissement de l'embrayage et le couple de commande. Le nouveau système conception est doté d'un stator en forme de griffes et des pôles de rotor saillants faciles à usiner et à installer dans un espace restreint dans la voiture. Une étude complète de conception avec des tests concrets de preuve de concept a été accomplie.Rééduire le PECR dans les assemblages de transmissions améliorera l'efficience du système et mènera à davantage d'économie de carburant. L'impact technologique sera ainsi bénéfique non seulement pour l'utilisateur, qui profitera d'un kilométrage plus élevé pour son argent, mais aussi pour l'environnement.
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Butsuen, Tetsuro. "The design of semi-active suspensions for automotive vehicles". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14220.
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Mack, Newton Eliot. "Cost effective design of composite structure for automotive applications". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38157.
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Low, Wai Leung 1977. "Cell and equipment design in the automotive components industry". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89323.
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Anusuya, Thiruchelvan Niveditha. "Design of an antenna for automotive communication in FM band". Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217297.
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Antennas used for FM transmission in radio stations are too large and to fit in the same for vehicular communication is inconceivable, considering the dimensional aspects. The product “EVAM System” is used for automotive communication in emergency vehicles. This product uses FM band for transmission of traffic information to the surrounding vehicle. The FM antennas normally installed on the vehicles are used for reception. The radiation efficiency of these antennas is too low and VSWR is too large. Thus, the FM reception antennas reflect the power at large scale, damaging the product as a result. The main objective of this thesis is to design a low-profile antenna, which can be mounted on the emergency vehicle as demanded by H&E Solutions AB. In addition to the dimensional requirements, the antenna should also satisfy the specified performance characteristics. These specifications are explained in detail and a design that best suits the product is developed considering both dimensional and performance characteristics.Antennerna som används för FM-överföring i radiostationer är för stora och att passa in i detsamma för fordonskommunikation är otänkbart med tanke på dimensionella aspekter. Produkten "EVAM System" används för bil kommunikation i nödfordon. Denna produkt använder FM-band för överföring av trafikinformation till omgivande fordon. FM-antennerna som normalt installeras på fordonet används för mottagning. Strålningseffektiviteten hos dessa antenner är för låg och VSWR är för stor. FM-mottagningsantennen reflekterar således kraften i stor skala vilket skadar produkten som ett resultat. Huvudsyftet med denna avhandling är att utforma en lågprofilantenn som kan monteras på nödfordonet enligt kravet från H & E Solutions AB. Förutom de dimensionella kraven ska antennen också uppfylla de angivna prestandaegenskaperna. Dessa specifikationer förklaras i detalj och en design som bäst passar produkten är utvecklad med tanke på både dimensions- och prestandaegenskaper.
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Cuata, Cervantes Jonathan Eduardo. "Optimizing automotive electrical distribution systems design and development by reducing design iterations". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/106239.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 122-123).
The design and development (D&D) of electrical distribution systems (EDS) is a practice that has been performed in the automotive industry for more than 100 years. The amount of technology infusion in vehicles within this history impacts the design and development of electrical distribution systems in an exponential manner. The electrical architecture of a vehicle increases in complexity with every new product launched into the market. The number of interactions and interdependencies between design and development activities, and across functional groups, has been increasing as a consequence of the constant innovation in the vehicle electrical architecture. These interdependencies and interactions with design and development tasks and cross functional groups generate potential design iterations and rework loops that have direct impacts on the cost, scope and schedule of automotive projects. This research has a fundamental purpose, the review of the electrical distribution systems design and development process inside an automotive OEM through the use of (1) traditional and modern project management tools, (2) surveys and interviews inside the OEM EDS organization, and (3) a review of product development literature, in order to identify recommendations to reduce unplanned design iterations and rework generated by the nonlinear nature of automotive product development. While the analyses, summary and recommendations are specific to EDS product development, it is hoped that the use of both traditional and modern project management tools described in this thesis can serve as a model for those in other industries.
by Jonathan Eduardo Cuata Cervantes.
S.M. in Engineering and Management
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Villarroel, Wladimiro. "Automated design and optimization of VHF/UHF automotive conformal antennas /". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486462702467141.
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LORING, ERIC JAMES. "LAND DEVELOPMENT PROJECT AT CORTARO-CROSSINGS: CIVIL ENGINEERING SENIOR DESIGN PROJECT". Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/190680.
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Bernau, Samantha Anne, Johnny Vogel, Thomas Cahir, Ariana Lamanda, Si Woo Lee, Kelsey Newman y Samantha Bernau. "Engineering Senior Design Project: Mouse Positioning Cradle". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/297514.
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The goal of this project was to design a cradle for restraining and positioning mice in an MRI machine. The sponsor, University of Arizona faculty member Dr. Marty Pagel, collects MRI images of animals for cancer research. Previously, the best option available for restraining the anesthetized mouse subject in the MRI consisted of little more than taping the subject to a PVC pipe. The engineering team created a new cradle designed to be easy to use while also removing the necessity of applying tape directly to the mice subjects for restraint, and providing a more even heat dispersion over them while in the MRI. The new cradle system features a removable sled that secures the mouse, and it provides spaces for catheters and monitoring devices, a connector for the existing heater tube that directs the hot air around the subject from under the sled, and an adjustable vertical positioning screw for improved target-centering capability in the MRI machine. The new design improved the repeatability of MRI scans and reduced potential sources of injury to the animal subject while maintaining the ease of use similar to the previous cradle.
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Lee, Si Woo, Johnny Vogel, Thomas Cahir, Ariana Lamanda, Kelsey Newman y Samantha Bernau. "Engineering Senior Design Project: Mouse Positioning Cradle". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/297640.
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The goal of this project was to design a cradle for restraining and positioning mice in an MRI machine. The sponsor, University of Arizona faculty member Dr. Marty Pagel, collects MRI images of animals for cancer research. Previously, the best option available for restraining the anesthetized mouse subject in the MRI consisted of little more than taping the subject to a PVC pipe. The engineering team created a new cradle designed to be easy to use while also removing the necessity of applying tape directly to the mice subjects for restraint, and providing a more even heat dispersion over them while in the MRI. The new cradle system features a removable sled that secures the mouse, and it provides spaces for catheters and monitoring devices, a connector for the existing heater tube that directs the hot air around the subject from under the sled, and an adjustable vertical positioning screw for improved target-centering capability in the MRI machine. The new design improved the repeatability of MRI scans and reduced potential sources of injury to the animal subject while maintaining the ease of use similar to the previous cradle.
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Lamanda, Ariana Corinne, Johnny Vogel, Thomas Cahir, Si Woo Lee, Kelsey Newman y Samantha Bernau. "Engineering Senior Design Project: Mouse Positioning Cradle". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/297638.
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The goal of this project was to design a cradle for restraining and positioning mice in an MRI machine. The sponsor, University of Arizona faculty member Dr. Marty Pagel, collects MRI images of animals for cancer research. Previously, the best option available for restraining the anesthetized mouse subject in the MRI consisted of little more than taping the subject to a PVC pipe. The engineering team created a new cradle designed to be easy to use while also removing the necessity of applying tape directly to the mice subjects for restraint, and providing a more even heat dispersion over them while in the MRI. The new cradle system features a removable sled that secures the mouse, and it provides spaces for catheters and monitoring devices, a connector for the existing heater tube that directs the hot air around the subject from under the sled, and an adjustable vertical positioning screw for improved target-centering capability in the MRI machine. The new design improved the repeatability of MRI scans and reduced potential sources of injury to the animal subject while maintaining the ease of use similar to the previous cradle.
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Newman, Kelsey Renee, Johnny Vogel, Thomas Cahir, Ariana Lamanda, Si Woo Lee y Samantha Bernau. "Engineering Senior Design Project: Mouse Positioning Cradle". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/297725.
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The goal of this project was to design a cradle for restraining and positioning mice in an MRI machine. The sponsor, University of Arizona faculty member Dr. Marty Pagel, collects MRI images of animals for cancer research. Previously, the best option available for restraining the anesthetized mouse subject in the MRI consisted of little more than taping the subject to a PVC pipe. The engineering team created a new cradle designed to be easy to use while also removing the necessity of applying tape directly to the mice subjects for restraint, and providing a more even heat dispersion over them while in the MRI. The new cradle system features a removable sled that secures the mouse, and it provides spaces for catheters and monitoring devices, a connector for the existing heater tube that directs the hot air around the subject from under the sled, and an adjustable vertical positioning screw for improved target-centering capability in the MRI machine. The new design improved the repeatability of MRI scans and reduced potential sources of injury to the animal subject while maintaining the ease of use similar to the previous cradle.
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Rickel, Jayson Anthony. "Engineering Senior Design Project: Robotic Lawn Mower". Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/321922.
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Oropeza, Guillermo 1975. "Production system design and implementation in the automotive components industry". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/89306.
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Domeij, Bäckryd Rebecka. "Multidisciplinary Design Optimization of Automotive Structures". Licentiate thesis, Linköpings universitet, Hållfasthetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-89136.
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Multidisciplinary design optimization (MDO) can be used as an effective tool to improve the design of automotive structures. Large-scale MDO problems typically involve several groups who must work concurrently and autonomously for reasons of efficiency. When performing MDO, a large number of designs need to be rated. Detailed simulation models used to assess automotive design proposals are often computationally expensive to evaluate. A useful MDO process must distribute work to the groups involved and be computationally efficient. In this thesis, MDO methods are assessed in relation to the characteristics of automotive structural applications. Single-level optimization methods have a single optimizer, while multi-level optimization methods have a distributed optimization process. Collaborative optimization and analytical target cascading are possible choices of multi-level optimization methods for automotive structures. They distribute the design process, but are complex. One approach to handle the computationally demanding simulation models involves metamodel-based design optimization (MBDO), where metamodels are used as approximations of the detailed models during optimization studies. Metamodels can be created by individual groups prior to the optimization process, and therefore also offer a way of distributing work. A single-level optimization method in combination with metamodels is concluded to be the most straightforward way of implementing MDO into the development of automotive structures.
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Klippel, Brian (Brian Phillip) 1966. "A design methodology for automotive component manufacturing systems". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50428.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management, 1998.Includes bibliographical references (p. 93-94).
by Brian Klippel.
M.B.A.
S.M.
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Sgueglia, John. "Managing design changes using safety-guided design for a safety critical automotive system". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/106224.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2015.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 95-99).
The use of software to control automotive safety critical functions, such as throttle, braking and steering has been increasing. The automotive industry has a need for safety analysis methods and design processes to ensure these systems function safely. Many current recommendations still focus on traditional methods, which worked well for electro-mechanical designs but are not adequate for software intensive complex systems. System Theoretic Accident Model and Process (STAMP) and the associated System Theoretic Process Analysis (STPA) method have been found to identify hazards for complex systems and can be effective earlier in the design process than current automotive techniques. The design of a complex safety-critical system will require many decisions that can potentially impact the system's safety. A safety analysis should be performed on the new design to understand any potential safety issues. Methods that can help identify where and how the change impacts the analysis would be a useful tool for designers and managers. This could reduce the amount of time needed to evaluate changes and to ensure the safety goals of the system are met. This thesis demonstrates managing design changes for the safetyƯ-guided design of an automotive safetyƯ-critical shift-by-wire system. The current safety related analysis methods and standards common to the automotive industry and the system engineering methods and research in the use of requirements traceability for impact analysis in engineering change management was reviewed. A procedure was proposed to identify the impact of design changes to the safety analysis performed with STPA. Suggested guidelines were proposed to identify the impact of the change on the safety analysis performed with STPA. It was shown how the impact of the design changes were incorporated into the STPA results to ensure safety constraints are managed with respect to these changes to maintain the safety controls of the system throughout the design process. Finally the feasibility of the procedure was demonstrated through the integration of the procedure with requirements traceability based on system engineering practices
by John Sgueglia.
S.M. in Engineering and Management
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Jönsson, Johan. "Design of a tilting test rig for automotive parts". Thesis, KTH, Tillämpad maskinteknik (KTH Södertälje), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203794.
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Zhou, Xianjie. "Formulation of an interactive ruled-based design envelope for ensuring aftermarket vehicle dynamics compliance". Thesis, Clemson University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10246430.
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The objective of this research is to develop an integrated system engineering methodology for the customization design to maximize vehicle performance upgrade freedom while ensuring vehicle dynamics compliance.
A post-delivery modification framework, which is led by an aftermarket umbrella organization and involve various stakeholders has been established. The umbrella organization will be in charge of developing the design envelope and distribute to various aftermarket kit suppliers to generate specific products according to their brand essence.
A generic mathematical representation of a (proprietary) ESC system has been developed for virtual certification purposes. This approach is a cost-effective alternative to physical on-road testing and hardware-in-the-loop (HiL) simulations. Furthermore, based on the stability control model, the modification impacts on the vehicle dynamics and stability performance was assessed using the Taguchi design of experiment (DOE) method. DOE results provide three distinct ways for supporting aftermarket modifications. First, main effects help customizers to understand which modification bring benefits or risks. Second, a regression model of the lateral offset metrics helps suppliers to predict closed-loop performances with open-loop testing information which require much less time and cost. Finally, the pass/fail criteria regarding federally mandated ESC compliance (FMVSS 126) brought on the ‘Pass Region’ which consisted of feasible configurations such that customizers may configure their options within a safe zone. Each of these methods complements others for supporting the aftermarket modification.
In order to improve the computation efficiency, two lower fidelity models were developed: A linear model and a surrogate model. The linear model is derived from the high fidelity model with reduced degrees of freedom (DOF) and linearized parameters. Tire cornering stiffness is treated as constants for gentle maneuvers, and varying parameters for high-dynamic driving maneuver. The linear system is either a linear time-invariant (LTI) system or a linear parameter-varying (LPV) system depending on the application context. The PD yaw stability control algorithm, which is inherited from the high fidelity model, was simplified but retained with critical nonlinear features. A quadratic regression model that was dedicated for compliance metrics was developed as a surrogate model incorporated in an interactive rule-based design envelope.
An interactive design envelope has been created incorporating the rules established using computational efficient linear and surrogate models. The constraint satisfaction problem is described in the nonlinear programming context and solved using sequential quadratic programming. The quasiconvexity of the design space, which is the necessary condition for the proposed approach, is also investigated by inspecting the constraint functions. Finally, two case studies were developed to demonstrate the framework developed which was validated against the high fidelity co-simulation model.
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Andersson, Johan y Adam Schelander. "Design and verification of automotive power supply". Thesis, Linköpings universitet, Fysik och elektroteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150147.
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In the current and next generation automotive telematic platforms, high demands are put on high efficiency power supplies. This thesis investigates different switch mode power converter solutions that operates with high efficiency for both low and high power loads. A market survey was conducted alongside meetings with ACTIA Nordic and their subcontractors. Three solutions from the market survey were selected for further investigation. One solution from the investigation was selected and implemented as a demonstration platform for further testing. The result shows a full test sequence for the designed power supply solution.
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Liu, Yao. "Design of spatial interfaces for engineering assembly within a virtual environment for automotive design". Thesis, University of Leeds, 2003. http://etheses.whiterose.ac.uk/1319/.
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This thesis presents studies on the design of a novel two-handed spatial interface for engineering assembly, informed by a number of qualitative studies using a realistic assembly model within a fully working virtual environment (VE). The results show that the two-handed spatial interface has the potential to reduce task-performance times by more than 25%, over an existing one-handed spatial interface. The VE is the IVPS (Interactive Virtual Prototyping System) at University of Leeds, which supports interactive engineering assembly. The main contribution of this research is to demonstrate an improved understanding of task performance for engineering assembly. By understanding the assembly task-performance through the evaluation of the existing IVPS using a desktop-based interface, the strengths and weakness of the existing interaction techniques are studied. The results strongly suggest that there is a need to know if more expressive spatial interaction could improve the task-performance for engineering assembly within a VE. By understanding the assembly task-performance through an evaluation of a one-handed spatial interaction model within the IVPS, a number of problems in spatial selection and positioning have been identified. They are the problems of scale (such as selecting a very small feature from a component), slide (such as manipulating constrained components in an assembly), global precision (such as manipulating the entire scene in which some components are long way from the centre of rotation) and related precision (such as manipulating the selected component related to the other components). A novel cube-based two-handed spatial interface has therefore been designed to overcome these problems in spatial selection and positioning. It assigns to the nondominant hand tasks such as positioning that can be performed by a sequence of 1DOF sub-tasks. This leaves the dominant-hand to perform the tasks such as 6DOF manipulation of assemblies, selection and attachment. This interface uses a physical cube to provide the user with a spatial frame of reference. The evaluation results show that the cube-based two-handed spatial interface has the potential to reduce the task-performance time by more than 25%, over the existing one-handed spatial interface. A tentative hypothesis is finally generalized and offers opportunities for further research.
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Diaz, Dominguez David. "Enhancing the conceptual design process of automotive exterior systems". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70797.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 152-154).
Product development cycles in the automotive industry are being reduced and competition is more demanding than ever before. To be successful in this environment, Original Equipment Manufacturers need a product development process that delivers best-in-class value, at a competitive cost and with the shortest lead time. Within the development process, the conceptual design is the most important phase in the delivery of a nocompromise design solution. In this phase, design teams have the largest amount of latitude to create value in the product, but they also face high levels of uncertainty and incomplete information to make decisions. At a high level, the conceptual design phase encompasses four major steps. In the first step, value is defined from the stakeholder perspective and system objectives are defined. The second step involves a divergent process in which design space is explored and several concept alternatives are generated to meet the system objectives. The third is a convergent process in which design alternatives are matured, evaluated and one is selected. In the fourth step, the architecture of the system is articulated. The intended impact of this thesis is to enhance the value delivered in the conceptual design phase and prevent waste in downstream activities within the product development process. To achieve this, the conceptual design processes of a major automotive manufacturer were studied to identify the problems that constrain value delivery and generate waste. The findings of this study and the exploration of existing concept development frameworks were synthesized in a concept development methodology focused on automotive Exterior Systems.
by David Diaz Dominguez.
S.M.in Engineering and Management
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Masha, Bukola L. (Bukola Lewis) 1979. "Production system design and implementation in the European automotive components industry". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89886.
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Tang, Hairong. "A design strategy applied to sulfur resistant lean NOx̳ automotive catalysts". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33717.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2005.In title on t.p. double-underscored "x" appears as subscript.
Includes bibliographical references (p. 123-135).
Catalyst poisoning due to sulfur compounds derived from fuel sulfur presents a major challenge, intractable thus far, to development of many advanced technologies for automotive catalysts such as the lean NOx, trap. Under lean conditions, sulfur will be oxidized to S0₃ and then form sulfate on the trap. The sulfate on the trap is thermodynamically very stable and, thus, difficult to purge. The NOx trap will then be deactivated over time. Our objective has been to build up a framework for the design of selective, sulfur resistant, oxidation automotive catalysts, which are active for the oxidation of NO to NO₂ but relatively inactive for the oxidation of SO₂ to S0₃. It is well known that the catalytic properties of alloys are often superior to those of pure metals, because of either the electronic effect or the ensemble effect or both. The ensemble effect is due to a change in distribution and availability of surface reaction sites, while the electronic effect is due to a change in electronic structure, leading to a change in rate constants of elementary steps. However, a very large number of possible compositions of alloys exist for any particular application.
(cont.) Therefore, a fundamental understanding of the relationship between the electronic structure, the composition, and the activity of alloys, which could aid in catalyst design, is first developed. This is accomplished by constructing a generalized weighted d-band center model for the prediction of the binding strength of chemisorbed molecules, in which the various atoms in the molecules bind unequally to multiple types of surface atoms. This model is then applied to estimate the adsorption energies of SO₂ and NO at both initial states and transition states on various surfaces. Both energetic data and electronic structure data are obtained from first principles density functional theory calculations. Our model is found to predict well the relative stability of adsorbates on surfaces and can be used to predict the effects of different compositions on the energy of adsorption. A strong linear correlation is found between our new weighting of the positions of the d band of the surface and the molecular adsorption energy. These linear relationships are then used together with energy decomposition scheme for a coadsorbed system on surfaces, to predict the reactivity of SO₂ and NO oxidation on different surfaces.
(cont.) A catalyst which is selective for the oxidation of NO over SO₂ is then developed. This study should aid in the development of more effective catalysts for an extremely important environmental application.
by Hairong Tang.
Ph.D.
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Saman, Muhamad Zameri Mat. "Methodology of design for end of life value in automotive engineering". Thesis, Coventry University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421203.
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Ryberg, Ann-Britt. "Metamodel-Based Multidisciplinary Design Optimization of Automotive Structures". Doctoral thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140875.
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Multidisciplinary design optimization (MDO) can be used in computer aided engineering (CAE) to efficiently improve and balance performance of automotive structures. However, large-scale MDO is not yet generally integrated within automotive product development due to several challenges, of which excessive computing times is the most important one. In this thesis, a metamodel-based MDO process that fits normal company organizations and CAE-based development processes is presented. The introduction of global metamodels offers means to increase computational efficiency and distribute work without implementing complicated multi-level MDO methods. The presented MDO process is proven to be efficient for thickness optimization studies with the objective to minimize mass. It can also be used for spot weld optimization if the models are prepared correctly. A comparison of different methods reveals that topology optimization, which requires less model preparation and computational effort, is an alternative if load cases involving simulations of linear systems are judged to be of major importance. A technical challenge when performing metamodel-based design optimization is lack of accuracy for metamodels representing complex responses including discontinuities, which are common in for example crashworthiness applications. The decision boundary from a support vector machine (SVM) can be used to identify the border between different types of deformation behaviour. In this thesis, this information is used to improve the accuracy of feedforward neural network metamodels. Three different approaches are tested; to split the design space and fit separate metamodels for the different regions, to add estimated guiding samples to the fitting set along the boundary before a global metamodel is fitted, and to use a special SVM-based sequential sampling method. Substantial improvements in accuracy are observed, and it is found that implementing SVM-based sequential sampling and estimated guiding samples can result in successful optimization studies for cases where more conventional methods fail.
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Huster, Andrew Christian. "Design and Validation of an Active Stereo Vision System for the OSU EcoCAR 3". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1499251870670736.
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Tampi, Mahesh. "Strategic frameworks in automotive systems architecting". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76936.
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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 59-60).
More often than not, large-scale engineering concepts such as those used by creative automotive manufacturing companies require the incorporation of significant capital outlays and resources for the purposes of implementation and production of additional configurations. In most cases, these systems are employed in conditions that are in a constant state of change with regards to the extenuating macroeconomic conditions, market conventions, and customer demands and expectations, requiring a constant inspection of both the performance and quality of the components of the system. With rising fuel prices and a constantly changing global landscape, unique strategies have to be developed and used to create value for the stakeholders by taking into account the aesthetic appeal of the vehicles, their performance, fuel efficiency, and future technological enhancements, while minimizing manufacturing cost and time to delivery. For example, engine selection has a significant impact not only on the design architecture of the vehicle but also on the service infrastructure offered in society. Although strategic management principles hinge on the conventions of maximizing the expected value of uncertainties, flexibility in the architectural design of a large scale complex systems along with its current and future applications have to be taken into account in order to allow the developed systems to not only encompass the theoretical frameworks of conventional engineering but also metamorphose the theories and constructs of modem physics to deliver successful products in conditions characterized by constant geopolitical- social change and increasing global competition. The intent of this research is demonstrate that innovation and better strategic management of automotive designs and its implementation within the construct of the market environment will not only determine the success of the products offered in the short term but also lay the foundation for the long term growth of the enterprise through modular enhancements and serviceability opportunities.
by Mahesh Tampi.
S.M.in Engineering and Management
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Pinto, Alejandro S. M. Massachusetts Institute of Technology. "Technology adoption in automotive product development". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/105300.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 46-50).
The automotive industry is characterized by the early adoption of technology into their products. In recent years, the automotive industry has developed infotainment systems that encompass navigation, digital media, phone calls, safety and other elements. These infotainment systems are based on componentry similar to smartphones or tablet computers. In contrast to tablet computers, the automotive infotainment systems have followed the typical automotive product development pace, leaving the automotive infotainment systems with outdated hardware and software when compared to the consumer electronic industry. The automotive industry follow a model year cycle while consumer electronics quickly adapt to consumer demand with many releases over a single calendar year. The objective of this thesis is to present a new architecture specific to In-vehicle infotainment systems; providing a faster componentry adoption and faster software updates.
by Alejandro Pinto.
S.M. in Engineering and Management
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Tretten, Phillip. "Information design solutions for automotive displays : focus on HUD". Doctoral thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26558.
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Automotive systems are being developed to increase positive driver experiences and traffic safety. As these new technologies are being adapted into the automotive environment, i.e. safety systems and multimedia applications, are the drivers additionally taking with them nomad devices, i.e. mobile phones, media players, GPS devices, etc., into this environment making it more and more complex. This complexity does not help the driver and in some cases distracts the driver too. The number of information sources has escalated to new heights and this trend does not seem to be slowing down. To be able to keep up with the advances in information technology, which also includes advances in display technology, automobile manufacturers are seeking for new and/or different ways to attract potential customers without bending the traffic safety. In this thesis this phenomena is looked upon by studying how drivers could use the information presented to them in the automobile. What do drivers perceive as important information, how should it be presented, and where? To obtain this several studies were conducted to gain a more complete picture of a driver's perception, behavior, and preferences. First, a questionnaire was administered to three different culture groups; China (167), Sweden (142), and United States of America (89) to learn how they perceive the information's importance and placement. The results showed that the drivers preferred the locations used in their own automobiles, but could think of using the HUD for more advanced driving helps. Based upon those responses a second study was conducted in a fixed-based high fidelity driving simulator. Forty participants drove a baseline and a experiment block (ca 20 min each) in which they where given either 10 warnings or 10 messages from four locations found in automobiles; the Head-Up Display (HUD), Head Down Display (HDD), Infotainment Display (IF), and Center-Stack Display (CS). The measurements were time to respond, time to notice, glance time, fixation time, number of fixations, and their driving performance via lane deviation and average speed during in each particular situation. All the drivers preferred information being presented in the HUD and the data showed that their performance was just as good as in the IF location and significantly better than in the CS and HDD locations. Redundant information in the HUD and HDD were not preferred and the participants the HUD exclusively. These results gave support to test HUD in traffic and in the drivers own vehicles. Therefore 30 drivers were recruited to test a HUD during three around the clock days, which showed the automobiles actual speed in their own automobiles on the windscreen. The on-road test showed that HUD was significantly preferred over the HDD for speed information. The majority of the drivers also wanted important warnings to be made available there along with directional helps for navigation. In conclusion the HUD was seen as the "next step" in automobile development. To reduce time away from road, increase traffic awareness, and to "lift" necessary information from more difficult to notice, and attend to, locations to the traffic scene the HUD could be the solution to enhance traffic safety, while speedometer and warning areas could be "freed up" and used for other functions and systems, leaving the locations furthest away for non-critical information.Godkänd; 2011; 20110310 (phitre); DISPUTATION Ämnesområde: Industriell design/Industrial Design Opponent: Professor Jeff Caird, Department of Psychology, University of Calgary, Canada Ordförande: Professor Dennis Pettersson, Institutionen för ekonomi, teknik och samhälle, Luleå tekniska universitet Tid: Fredag den 13 maj 2011, kl 13.00 Plats: E632, Luleå tekniska universitet
OPTIVe - Optimised system integration for safe interaction in vehicles
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Di, Carlo Matteo. "Structural and Managerial aspects of the expansion of Edscha Automotive Technology (Kunshan)Shanghai, China". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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China is still a developing country, and she is currently under a period of economic booming time. This booming situation has provided great opportunities for overseas professionals, experts, organizations, firms, and all other market sectors to establish or expand their businesses in China. With much better technical and economic background, and as one of the largest developing regions in China, Shanghai has become a particularly attractive area to overseas investors.
China's 'open-door' policy has been introduced and implemented to the overall context of the economic and social reforms since 1979. The plan was designated to import foreign science, technology, managerial skills, expertise and financial capital to speed-up the economic reform program.
For implementing the 'open-door' policy, the Chinese Government firstly set up four 'special economic zones' in 1980, including Shenzhen, Zhuhai, Xiamen, and Shantou. In these zones, foreign businesses were allowed to operate businesses with their investment or by setting up joint-ventures with Chinese organizations. The practice of the four special zones turned out with great success. Following the successful establishment of the four SEZs, the Chinese Government expanded the special zones to other fourteen coastal cities in 1990, in which Pudong New Area in Shanghai, listed as the first one. All these new zones enjoy the same advantageous terms.
On the other hand, the Chinese Government has realized that domestic construction industry has for many years suffered as a result of long construction cycles, inadequate programming of projects. Therefore, the Government supports the involvement of overseas contractors in the competition for certain kind of construction projects, from that not only the advanced technology can be introduced or transferred to the Chinese industry, but also the knowledge of good management in construction cost, time, and quality can be obtained or shared.
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Zhu, Min. "Design of automotive joints : using optimization to translate performance criteria to physical design parameters /". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-165515/.
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Tapia, Carlos (Carlos Francisco) 1976. "Application of the production system design framework in the automotive components industry". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8553.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.Includes bibliographical references (p. 111-113).
The environment that companies face nowadays is increasingly competitive. In this setting firms must ensure that its Production System is aligned with its business objectives. However, Production Systems can be extremely complex and their design involves many different disciplines. The Manufacturing System Design Decomposition (MSDD) developed by the Production System Design Laboratory at MIT is useful to identify the objectives (Functional Requirements - FRs), and the corresponding implementation (Design Parameters - DPs) for the key decisions that must be made to design a manufacturing system. This work presents the Production System Design Framework, which is based on the MSDD, as a roadmap to approach the intricate design and implementation process. Special attention is placed on an important part of the framework: The Production System Design and Deployment Steps. This thesis exhibits the direct application of the PSD Framework to the design and implementation of an automotive components production system. The basis for this design is the MSDD and it is implemented through the Production System Design and Deployment Steps. Each step is described in detail and it is explained how it was adapted to the particular requirements of the project. Additionally, a manufacturing system of electronics components is examined. Two different system designs for the same product are studied. The analysis is performed using traditional performance metrics as the evaluating criteria. In addition, this analysis is contrasted to an analysis made using the MSDD. The similarities of the results validate the importance of the MSDD. Furthermore, the MSDD is used to identify potential areas for improvement.
by Carlos Tapia.
S.M.
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Bates, Michael C. "Parametric design of diesel engine inlet ports". Thesis, University of Brighton, 2004. https://research.brighton.ac.uk/en/studentTheses/6551124d-62d5-483b-a684-d02116f32059.
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Inlet port flow characteristics are critical in determining the overall performance of diesel combustion systems. The relationship between inlet port geometry and performance has long been a subject of interest to many researchers, although as yet a comprehensive understanding remains elusive. The ongoing need to provide advanced powertrain design solutions in order to meet increasingly stringent emissions legislation, whilst meeting customer expectations and minimising engineering costs, has driven the development of new approaches to engine design. In particular, the fundamental advantages of multivalve technology, coupled with rapidly improving fuel delivery systems has placed new requirements on inlet port performance characteristics. Statistical methods and knowledge-based design are emerging as potentially powerful tools in this field of research, supported by rapid developments in computing power.
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Maley, Evan D. "Suspension Design and Vehicle Dynamics Model Development of the Venturi Buckeye Bullet 3 Electric Land Speed Vehicle". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449164691.
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Li, Wei Ph D. Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science. "Design & optimization of automotive power electronics utilizing FITMOS MOSFET technology". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53317.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 178-179).
Power electronics are essential to many automotive applications, and their importance continues to grow as more vehicle functions incorporate electronic controls. MOSFETs are key elements in automotive power electronic circuits and MOSFET characteristics can strongly affect circuit size, cost and performance. Advances in MOSFET technology are thus of great importance to the advancement of automotive electronics. The new Floating Island and Thick Bottom Oxide Trench Gate MOSFET (FITMOS) developed at Toyota has tremendous potential for automobile applications due to its reduced on-resistance, improved temperature coefficient of resistance and reduced gate charge and input capacitance. In this research, we investigated the detailed characteristics of FITMOS devices, developed the SPICE model for simulation and explored their applications in the design of automotive power electronics. Specifically, we identified how to best utilize the FITMOS characteristics to benefit power circuit design and on quantifying the gains that can be achieved through their use. We also expose a previously unrecognized phenomenon in the FITMOS MOSFET. In particular, we show that the on-state resistance of the device depends on both frequency and on peak di/dt at a given frequency. This dynamic on resistance variation can have a significant application impact.
by Wei Li.
S.M.
41
Todorov, Vassil. "Automotive embedded software design using formal methods". Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG026.
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La part croissante des fonctions d'assistance à la conduite, leur criticité, ainsi que la perspective d'une certification de ces fonctions, rendent nécessaire leur vérification et leur validation avec un niveau d'exigence que le test seul ne peut assurer.Depuis quelques années déjà d’autres domaines comme l’aéronautique ou le ferroviaire sont soumis à des contextes équivalents. Pour répondre à certaines contraintes ils ont localement mis en place des méthodes formelles. Nous nous intéressons aux motivations et aux critères qui ont conduit à l’utilisation des méthodes formelles dans ces domaines afin de les transposer sur des scénarios automobiles et identifier le périmètre potentiel d'application.Dans cette thèse, nous présentons nos études de cas et proposons des méthodologies pour l'usage de méthodes formelles par des ingénieurs non-experts. Le model checking inductif pour un processus de développement utilisant des modèles, l'interprétation abstraite pour démontrer l'absence d'erreurs d'exécution du code et la preuve déductive pour des cas de fonctions critiques de librairie.Enfin, nous proposons de nouveaux algorithmes pour résoudre les problèmes identifiés lors de nos expérimentations. Il s'agit d'une part d'un générateur d'invariants et d'une méthode utilisant la sémantique des données pour traiter efficacement des propriétés comportant du temps long, et d'autre part d'un algorithme efficace pour mesurer la couverture du modèle par les propriétés en utilisant des techniques de mutationThe growing share of driver assistance functions, their criticality, as well as the prospect of certification of these functions, make their verification and validation necessary with a level of requirement that testing alone cannot ensure. For several years now, other industries such as aeronautics and railways have been subject to equivalent contexts. To respond to certain constraints, they have locally implemented formal methods. We are interested in the motivations and criteria that led to the use of formal methods in these industries in order to transpose them to automotive scenarios and identify the potential scope of application.In this thesis, we present our case studies and propose methodologies for the use of formal methods by non-expert engineers. Inductive model checking for a model-driven development process, abstract interpretation to demonstrate the absence of run-time errors in the code and deductive proof for critical library functions.Finally, we propose new algorithms to solve the problems identified during our experiments. These are, firstly, an invariant generator and a method using the semantics of data to process properties involving long-running timers in an efficient way, and secondly, an efficient algorithm to measure the coverage of the model by the properties using mutation techniques
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Weston, Nicholas John. "Time estimation in mechanical engineering design". Thesis, Durham University, 1994. http://etheses.dur.ac.uk/1218/.
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This thesis describes investigations into the phenomenon of time estimation in mechanical engineering design. Time estimating in this context refers to estimating in advance the approximate duration of a new design project, for the purpose of preparing schedules. The thesis describes background to the estimation problem, including practical and theoretical aspects of design, design management and market conditions. The research presented is based on data gathered from industrial collaborators, therefore detailed descriptions of the collaborating firms are included. A quantitative study is described which demonstrates that current estimation techniques are not infallible; and that there can be a statistically significant link between the estimated and actual completion times. A process of grounded theorising, based on expert interviews, is presented. Models of the design estimation task were generated by this process, and are included. Differences were found in the models for the estimation of times in an Engineer to Order (ETO) environment, and estimation in a Volume Manufacturing environment. The models were corroborated firstly by checking if they could be recognised and endorsed by the experts from which they were generated, and. secondly by checking if they could be recognised and endorsed by an expert not involved in the original model generation. Correspondence was found to be good. A modified model of time estimation is presented, taking into account the findings of the corroboration exercise. Finally, an example of a simple tool for assisting the estimation process is included.
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Kwon, Hyun Sik. "Development of Automated Design Tools for Automotive Automatic Transmission Gear System". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1370019857.
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Fallu, John W. (John William) 1966. "Internalization of robust engineering methods in automotive product development : a study of corporate quality change in a large, mature automotive company". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/34735.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2004.Includes bibliographical references.
It is broadly recognized in the automotive industry, as well as many others, that those organizations that can deliver timely new products or existing product upgrades at desired cost and quality targets will produce higher levels of customer satisfaction, higher profits and a significant competitive advantage. In an attempt to improve the product development process and the quality of engineering, many automotive firms have implemented, and continue to implement, numerous initiatives designed to increase the discipline within the engineering process with the expectation of meeting cost, timing, and customer satisfaction/quality targets. Improved product development systems, 6-sigma, reliability methods, and 8-D's, are some of the initiatives that have been utilized in attempts to improve the quality operating systems of the organization and tie engineering improvements to customer needs. While these initiatives have been successful within certain areas, there continues to be a shortfall between required performance and actual quality levels in some large, mature firms. While there has been substantial quality and cost improvement in the past few years, increasing competition continues to demand higher and higher value for the customer. Satisfying market requirements and permanently improving the quality of vehicles developed requires a complete understanding of the demands on the engineering system, including the enablers and roadblocks to the full utilization of robust engineering practices. This research examines one automotive company's product development process to determine how and why short cuts in the product development process are typically made.
(cont.) Through studying the progression of cultural change in the organization as related to the utilization of robust engineering tools, the roadblocks and the causal factors for lack of internalization and application of robust practices are identified. Finally, based on the study's analysis and results, effective corrective actions are identified and recommendations for their incorporation are made.
by John W. Fallu.
S.M.
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Scheber, Robert Thomas. "Engineering Senior Design Project: Ducted Unmanned Aerial Vehicle Development". Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/555566.
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Team 1313 of the Honeywell sponsored Unmanned Aerial Vehicle Development (UAV) project completed the following report during the Fall 2013 and Spring 2014 semesters as part of ENGR 498A/B. The main purpose of the project was to investigate the potential benefits of a ducted UAV versus a nonducted UAV. The product was initially designed for use by emergency responders such as firefighting crews. The team was also responsible for updating the electronic and avionic systems as well as redesigning a more stable flight platform. Team 1313 converted the original two motor UAV to a four motor quad copter design. The team also upgraded the electronics and flight software. The following report displays Team 1313’s success in developing the ducted UAV system and details the different design components, software architecture, graphical user interface, design analysis, acceptance testing, and challenges.
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Bonyadi, Roozbeh. "Reliability assessment and modelling of power electronic devices for automotive application and design". Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/90139/.
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The emergence of the hybrid electric vehicle and electric vehicles (HEV and EV) requires the reliability assessment of power electronic devices used in the inverters. This includes the electro-thermal reliability of bipolar devices such as IGBTs and PiN diodes and more recently, the SiC MOSFETs since the SiC technology is not as mature as their bipolar counterparts. This research, in its own capacity, through the use of accurate compact models, investigates the switching performance and characteristics of silicon IGBTs, PiN diodes and SiC MOSFETs. The need for higher power densities and fast device switching causes certain concerns in the performance and terminal characteristics of the converter. SiC MOSFET is a potential power device for implementing EV drivetrain inverters. One of the major advantages of SiC MOSFET is the possibility of using their body diodes for reverse current conduction, thereby obviating the need for lossy silicon PiN diodes. The primary goal of using SiC MOSFETs is to enable high frequency switching since the significantly lower switching losses coupled with the high dI/dt and dV/dt can increase the power density. This research has investigated and modelled the use of the SiC body diode for current commutation under high dV/dt conditions. Since the body diode is not designed to operate under such conditions, the electrothermal robustness of SiC body diode is investigated by simulating parasitic BJT latch-up that results from hard current commutation under high dV/dt. In a power MOSFET, high switching rates coupled with the drain-body capacitance brings about a displacement current passing through the resistive path of the P-body in the MOSFET structure which creates a voltage at the base of the parasitic BJT within the device. This BJT latch-up under certain thermal conditions is capable of destruction of the device. Another problem induced by high switching speed is that of the electrical coupling between complementing devices in the same leg of the inverter which is known as cross-talk or parasitic gate turn-on. In this research, the unintentional switching of IGBTs and the resulting short circuit current surge passing through the devices as a consequence of reducing the dead-time as well as increasing the switching rate is investigated and modelled. This is due to the discharge of the Miller capacitance which feeds back a current into the gate of the transistor. The result is that both transistors are switching on in the same phase leg. The other problem which is addressed in this research is modelling the switching transients of parallel connected IGBTs for the purpose of delivering high current conduction capability. The electrothermal energy balancing between the parallel connected IGBTs is important as the electrothermal variation between the parallel connected devices can cause temperature imbalance, thereby, accelerating the degradation of the power module. This research investigates the variations in the electrical time constants and the thermal time constants between the parallel connected devices and models the switching behaviours. Lastly, this research has focused on designing and fabricating power modules suitable for EV application and has tried to address methods to improve the electrothermal performance of the device and has investigated the impact of parasitic inductance of the layout on the electrothermal performance of the power module.
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Morgan, Thea Rose. "Constructivism, complexity, and design : reflecting on group project design behaviour in engineering design education". Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738243.
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Wong, Amy L. (Amy Lai). "Axiomatic design of a customizable pneumatic automotive suspension with hydraulic ride height regulator". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32970.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, June 2005."May 2005."
Includes bibliographical references (leaf 15).
Stiffness has long since governed the way people choose automobiles. Stiffer suspensions allow for the better handling necessary in sporty cars while softer suspensions provide the comfort expected in luxury cars. Automobiles have also been limited by ride height: a higher ride height will yield more clearance from bumps along the ground. However, lower ride height lowers the center of gravity of the car, which is desired for safety. The purpose of this work is to propose a way of using axiomatic design to device a system that uses orifice controlled dampers, pneumatic springs and hydraulic chambers to achieve a fully customizable suspension system and ride height regulation. In addition, a way to create the best possible user experience is proposed by using control theory to keep the car chassis at the same level at all times, thus giving the user the ability to have a smooth ride at any suspension setting, even stiff suspension systems in the case of sporty car settings. To achieve the goals of this work, a short-long arm (SLA) suspension system was modeled and modified. The SLA suspension system is the most common front wheel independent suspension system that is used today.
(cont.) By keeping a similar overall design for the proposed system, adaptability of the proposed system is increased. The coil spring of the common SLA suspension system is replaced by an air spring with a fluid chamber in series. The air spring has a variable spring stiffness that is related to the volume of air inside. Because air is compressible, the volume changes with the force applied, yielding a nonlinear relationship that must be compensated for by an active control system that monitors the overall volume of the air spring and compensates for any changes during use by addition or removal of air. The fluid chamber is responsible for keeping the chassis at the same level at all times by taking into account the changing volume of the air spring and the changes in the road by having incompressible fluid pumped in and out of the chamber.
by Amy L. Wong.
S.B.
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Truong, Hai The 1962. "Management framework of automotive full service supplier in computer aided engineering (CAE)". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/91742.
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Penney, John 1974. "Managing the implementation of automotive emission control technologies using systems engineering principles". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/34737.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2004.Includes bibliographical references (p. 79-80).
In the 1940s and 1950s poor air quality in major metropolitan areas throughout the United States started to negatively influence the health of citizens throughout the country. After numerous studies the government concluded that mobile sources of air pollution were a significant contributor to the deteriorating air quality. From that point onwards, the automobile manufacturers have been forced to comply with ever tightening emission regulations. This thesis describes an original investigation into the conflicting clockspeeds that prohibit rapid integration of new automobile emission technologies into production automobiles. Common themes and barriers to technology implementation are uncovered by systematically analyzing current production emission technology and exhaust gas after-treatment systems, and investigating how those systems have evolved over the years. A heuristic for analyzing the technology clockspeed is developed by decomposing the problem into four interconnected cycles. These four cycles correspond to the government's process to develop new automobile emission control regulations and the automobile manufacturer's ability to engineer and certify vehicle platforms, engines, and combustion after-treatment systems. This thesis analyzes the emission control technology development process in six chapters. The first chapter deals with setting the scope and defining the boundaries of the systems that will be analyzed. Chapter two analyzes the driving forces behind the creation of emission regulations and the legislative processes that transform ideas into law. Chapter three analyzes the second level decomposition of the problem at the vehicle level with a specific emphasis on Ford Motor Company's Fox vehicle platform.
(cont.) The fourth chapter decomposes the problem to the engine system level with a focus on the production history of American V8 engines. Chapter five investigates the management of a catalytic converter development program and recommends an organizational structure to efficiently develop catalytic converter systems. The organizational structure recommendation is based on results obtained from a task oriented design structure matrix and a system engineering decomposition.
by John Penney.
S.M.