Thèses : « Computer-Aided Conceptual Design »

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Cartwright, Alan John. « Application of definitive scripts to computer aided conceptual design ». Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/107574/.

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The creative phases of design are based upon the human ability to conceptualise or abstract ideas from physical observations of the real world. That ability comes from experience, based on experiment: discerning patterns of behaviour in particular sets of observations. In this work it is shown that the process of identification, experiment and abstraction may be modelled accurately on a computer by definitive, or agent-oriented, programming, so forming a powerful aid to conceptual design. A new computer modelling language, called EdenLisp, has been developed by the author around Definitive Notations and interfaced to a commercial Computer Aided Design package. It provides a tool whereby computer models of systems can be originated that have state and on which state change can be made, not only by the designer but also by other autonomous agents of change Experiments with the language are described that show that scripts of definitions can have characteristics that permit the design to proceed as if there were an engineering prototype of the physical system being designed. The explicit representation of state at the lowest levels permits experimentation, observation of properties and addition of further observations. The interactive construction of EdenLisp is analogous to the conceptual design process It is used to illustrate and test design meta-theories for modelling conceptual design. It is shown to have potential for concurrent or multi-agent design, and is also an excellent vehicle for design education.

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Bérard, Adrien. « Method Development for Computer Aided Engineering for Aircraft Conceptual Design ». Licentiate thesis, KTH, Aeronautical and Vehicle Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9240.

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This thesis presents the work done to implement new computational tools and methods dedicated to aircraft conceptual design sizing and optimization. These tools have been exercised on different aircraft concepts in order to validate them and assess their relevance and applicability to practical cases.First, a geometry construction protocol has been developed. It is indeed essential to have a geometry description that supports the derivation of all discretizations and idealizations used by the different analysis modules (aerodynamics, weights and balance, stability and control, etc.) for which an aircraft concept is evaluated. The geometry should also be intuitive to the user, general enough to describe a wide array of morphologies and suitable for optimization. All these conditions are fulfilled by an appropriate parameterization of the geometry. In addition, a tool named CADac (Computer Aided Design aircraft) has been created in order to produce automatically a closed and consistent CAD solid model of the designs under study. The produced CAD model is easily meshable and therefore high-fidelity Computational Fluid Dynamics (CFD) computations can be performed effortlessly without need for tedious and time-consuming post-CAD geometry repair.Second, an unsteady vortex-lattice method based on TORNADO has been implemented in order to enlarge to scope of flight conditions that can be analyzed. It has been validated satisfactorily for the sudden acceleration of a flat plate as well as for the static and dynamic derivatives of the Saab 105/SK 60.Finally, a methodology has been developed to compute quickly in a semi-empirical way the buffet envelope of new aircraft geometries at the conceptual stage. The parameters that demonstrate functional sensitivity to buffet onset have been identified and their relative effect quantified. The method uses a combination of simple sweep theory and fractional change theory as well as the buffet onset of a seed aircraft or a provided generic buffet onset to estimate the buffet envelope of any target geometry. The method proves to be flexible and robust enough to predict within mainly 5% (and in any case 9%) the buffet onset for a wide variety of aircrafts, from regional turboprop to long-haul wide body or high-speed business jets.This work was done within the 6^th European framework project SimSAC (Simulating Stability And Control) whose task is to create a multidisciplinary simulation environment named CEASIOM (Computerized Environment for Aircraft Synthesis and Integrated Optimization Methods), oriented toward stability and control and specially suited for aircraft conceptual design sizing and optimization.

SimSAC

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Welsh, Martin. « A computer-aided conceptual ship design system incorporating expert knowledge ». Thesis, University of Newcastle Upon Tyne, 1989. http://hdl.handle.net/10443/398.

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In today's highly competitive shipbuilding market the emphasis is on the production of acceptable design proposals within a very short timescale. A computer-aided conceptual ship design system, which utifises the latest developments in workstation technology, has been developed. It is intended to help reduce the technical and commercial risks associated with the process of tendering for newbuilding contracts. The system as a whole, uses fundamental modeffing techniques to enable areas such as dimensions generation, huilform development, layout design, powering estimation, mass estimation, motions prediction, work content estimation and cost estimation to be considered at a much greater level of detail at the concept design stage than was previously possible. This thesis describes the specification and development of those parts of the overall design system concerned with the generation of vessel dimensions and huliform and layout design. In order to improve the flexibility of the system, a so-called expert system approach has been adopted to provide the mechanism for the control of the design methodology. For this purpose, a unique expert system shell named INCODES (INtelligent COncept DEsign System) was specified and developed. The development of this shell is described in some detail. The application of the INCODES shell to the control of the logic involved in the development of design proposals for containerships is discussed, and the knowledge base developed for the generation of these design proposals is described. The knowledge base is shown to incorporate fundamental procedures for the generation of vessel dimensions and for huliform and layout design, as well as a comprehensive suite of analysis routines to assist in the verification of the design proposals. The knowledge base is also considered to be unique in its treatment of the investigation of the loading arrangements of containership design proposals. The flexibility of the procedures developed is demonstrated by their application to the generation and examination of containership design proposals which possess a range of physical and operational characteristics.

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Bérard, Adrien. « Method development for computer aided engineering for aircraft conceptual design / ». Stockholm : School of Engineering Sciences, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9240.

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Han, Chonghun. « Human-aided, computer-based design paradigm : the automation of conceptual process design ». Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12248.

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Ginger, Robert Patrick. « A basis for computer-aided generation of design concepts for instrument systems ». Thesis, City University London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260239.

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Sittas, Efthimios. « Appropriate forms of solid modelling for conceptual design ». Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255666.

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Sarioz, Kadir. « A hydrodynamic hull form design procedure in conceptual and preliminary ship design ». Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332816.

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Girod, Maurice. « Decision-making : a laboratory-based case study in conceptual design ». Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/35705.

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The engineering design process may be seen as a series of interrelated operations that are driven by decisions: each operation is carried out as the consequence of an associated decision. Hence, an effective design process relies heavily upon effective decision-making. As a consequence, supporting decision-making may be a significant means for achieving design process improvements. This thesis concentrates on how to support selection-type decision-making in conceptual engineering design.

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Bradley, Ian. « A user maintainable knowledge based system for conceptual bridge deck design ». Thesis, Cardiff University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322780.

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Taleb-Bendiab, Azzelarabe. « Logic programming for conceptual engineering design : selection process by approximate matching ». Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316548.

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Douglas, Bryant S. « A conceptual level design of a Design Database for the Computer-Aided Prototyping System ». Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/24279.

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Vast amounts of evolving data are created in the design of hard real-time software systems. This data must be managed so that it can be stored and retrieved according to the needs of design engineers. In the Computer-Aided Prototyping System (CAPS), a Design Database (DDB) must manage the storage and retrieval of the entire Prototype System Description Language (PSDL) program. This thesis presents a conceptual design and initial implementation of a Design Database (DDB) for the Computer-Aided Prototyping System (CAPS).

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Zheng, Jianming, et 鄭建明. « VR interfaces for conceptual design using geometric modeling techniques ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31241396.

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Zheng, Jianming. « VR interfaces for conceptual design using geometric modeling techniques / ». Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24735978.

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Xu, Changxin. « Computational foundations for computer aided conceptual design of multiple interaction-state mechatronic devices ». College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2612.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.
Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Rivera, Rosario. « An empirical study of the conceptual stage of design in mechanical engineering and its implications for CAD ». Thesis, University of Wolverhampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309581.

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Babak, I., et E. Druzhinin. « Computer-Aided Design System Application at Conceptual Stage of Unmanned Air Vehicle Life Cycle ». Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47035.

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The steps of computer-aided design system application at conceptual stage of unmanned air vehicle life cycle are considered. Sequential and iterative approach to an aircraft design process are compared.

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Kolb, Mark A. « An investigation of constraint-based component-modeling for knowledge representation in computer-aided conceptual design ». Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14277.

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Galik, Daniel. « A conceptual design of a Software Base Management System for the Computer Aided Prototyping System ». Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22981.

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Approved for public release; distribution is unlimited
This thesis builds upon work previously done in the development of the Computer Aided Prototyping System (CAPS) and the Prototype System Description Language (PSDL), and presents a conceptual design for the Software Base Management System (SBMS) component of CAPS. The SBMS is the most critical component of CAPS as it will coordinate the retrieval and integration of Ada software modules. A robust SBMS that enables a software system designer to successfully retrieve reusable Ada components will expedite the prototype development process and enhance designer productivity. Implementation of the conceptual design will be the basis for further work in this area. (Ada is a registered trademark of the United States Government, Ada Joint Program Office.)
http://archive.org/details/conceptualdesign00gali
Lieutenant Commander, United States Navy

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Lopez, Flores René. « Collaborative framework in computer aided innovation 2.0 : Application to process system engineering ». Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0087/document.

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L'innovation est un processus complexe qui demande des techniques et des outils collaboratifs pour la gestion des connaissances et la communication, afin que les entreprises surmontent les défis d'une économie concurrentielle. Une nouvelle catégorie d’outils connus sous l’acronyme CAI (Computer Aided Innovation) émerge parmi l’éventail des technologies assistées par ordinateur afin de répondre aux demandes industrielles pour une plus grande fiabilité des nouveaux produits et procédés. L’objectif de ces outils (en cours de développement) est d’aider les concepteurs durant tout le processus d’innovation. Actuellement la mise en oeuvre d’un tel outil doit prendre en considération deux développements récents majeurs. Le premier est d’ordre technologique avec les possibilités offertes par le Web 2.0 dans le développement de logiciel. Le deuxième est plus stratégique avec un changement de vision de l’innovation passant de l’innovation fermée (interne à l’entreprise) à l’innovation ouverte (Open Innovation). Ces deux aspects conduisent à de nouvelles formes de CAI nommé Open CAI 2.0. Cette recherche propose une des briques d’un tel outil, pour assister les ingénieurs procédés à résoudre des problèmes innovants principalement dans la phase de conception préliminaire. Nous présentons la structure et la fonctionnalité d’un cadre de collaboration qui met en oeuvre une méthode développée basée sur le couplage entre la théorie TRIZ, et une technique de gestion des connaissances: le raisonnement à partir de cas (RàPC). Ce cadre est une extension du modèle TRIZ-RàPC validé dans le domaine du génie de procèdes. L’approche du processus de résolution est illustrée sur une étude de cas traitant de la gazéification de la biomasse
In economy nowadays, the act of innovation is in general social; it requires the management of knowledge, and the techniques and methodologies to drive it. Innovation is not the product of one isolated intelligence, instead, it is the result of a multi-disciplinary workgroup lead by a process or a methodology. The conceptual design, which is found in the first stages of the innovation process, represents one of the most important challenges in industry nowadays. One of the main challenges faced by chemical industries related to the conceptual design phase is to provide the means in the form of methods and computational tools, for solving problems systematically, at the same time that benefiting from the collective efforts of individual intelligences involved. Hence, the main objective of this work is to provide a solution to improve the creative capacity of a team involved in the innovation process, in particular the preliminary (critical) phase of conceptual design. Consequently, it is important to understand the techniques, methods and tools that best support the generation of novel ideas and creative solutions. In addition, it is necessary to study the contribution of information and communication technologies as the mean to support collaboration. Web technologies are considered as complementary tools to implement methods and techniques in collaborative design, and particularly in the conceptual design stage. These technologies allow setting up distributed collaborative environments to bring together the resources and the experts who can relate the existing pieces of knowledge to new contexts. It is the synergy created in this kind of environment, which allow producing valuable concepts and ideas in the form of Collective Intelligence. Nevertheless in most existing solutions for collective intelligence or crowdsourcing environments, they do not report the use of a particular methodology to improve the participants' creativity. The solution in this work describes a social network service that enables users to cooperatively solve problems oriented (but not limited) to the phase of conceptual design. In this work we propose that the use of Collective Intelligence in combination with the model TRIZ-CBR could lead the creative efforts in a team to develop innovative solutions. With this work we are looking for connecting experts from one particular field, TRIZ practitioners and stakeholders with the objective to solve problems in collaboration unlashing the collective intelligence to improve creativity. This work uses the basis of the concept named "Open CAI 2.0" to propose a solution in the form of a theoretical framework. The contributions seek to move the development of the field in Computer Aided Innovation a step forward

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Wampler, Steven Glenn. « Development of a CAD system for automated conceptual design of supersonic aitcraft ». Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/40935.

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Development of a conceptual aircraft design system based on ACSYNT, an aircraft synthesis program written by the NASA Ames Research Center; is discussed. The system, named ACSYNT/VPI, was written using the PHIGS graphics standard for machine independence and designed based on topÂ·down principles and standards. A functional description of ACSYNT is presented as well as detailed software requirements for ACSYNT/VPI. The softwareâ s design is covered in depth including design philosophies and software functional specifications. Program output and design results are presented in conjunction with project recommendations. The appendices include supporting design and development information.Master of Science

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Smart, Ronald S. « Automated Multidisciplinary Optimizations of Conceptual Rocket Fairings ». BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3058.

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The purpose of this research is to develop and architect a preliminary multidisciplinary design optimization (MDO) tool that creates multiple types of generalized rocket fairing models. These models are sized relative to input geometric models and are analyzed and optimized, taking into account the primary objectives, namely the structural, thermal, and aerodynamic aspects of standard rocket flights. A variety of standard nose cone shapes is used as optimization proof of concept examples, being sized and compared to determine optimal choices based on the input specifications, such as the rocket body geometry and the specified trajectory paths. Any input models can be optimized to their respective best nose cone style or optimized to each of the cone styles individually, depending on the desired constraints. Two proof of concept example rocket model studies are included with varying sizes and speeds. Both have been optimized using the processes described to provide delineative instances into how results are improved and time saved. This is done by optimizing shape and thickness of the fairings while ascertaining if the remaining length downstream on the designated rocket model remains within specified stress and temperature ranges. The first optimized example exhibits a region of high stress downstream on the rocket body model that champions how these tools can be used to catch weaknesses and improve the overall integrity of a rocket design. The second example demonstrates how more established rocket designs can decrease their weight and drag through optimization of the fairing design.

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Nordstedt, Tobias. « Conceptual Development of an Automated Corrugated Cardboard Box Filler ». Thesis, Uppsala universitet, Industriell teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-354431.

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The project aimed at conceptually develop a solution that is able to automatically transfer an already stacked and measured heap of goods from an order tote into an erected corrugated cardboard box, whereas the dimensions of the corrugated cardboard box and the stack are allowed to vary within a specified interval. The method for this project consisted of five main parts: feasibility study; concept generation; concept choice; design; and evaluation. The project was initiated by a feasibility study where the problem was clarified and knowledge regarding the problem was gathered. The feasibility study resulted in an user requirement specification and a product requirement specification. The product requirement specification was utilized in the evaluation processof the final developed concept. The concept generation was conducted according to structured methods prescribed by Ulrich and Eppinger. The concept choice was done by the use of Pughs concept choice matrix. The result of this project consists of a conceptual proposal of how the previously described problem may be solved. The final developed concept resulted in a cad model. The evaluation showed that the concept did not fulfill the product requirement specification, despite this it is assessed that the concept in its working principle has good merits that are worth further investigation. Further development of the concept remain and validation of the working principle is needed. Further choices concerning form, material, and components remain. The report contributes to a foundation for further development of an automated filling mechanism for erected corrugated cardboard boxes.

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Bukhari, Fakhri A. « A hierarchical evolutionary algorithmic design (HEAD) system for generating and evolving building design models ». Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/50964/1/Fakhri_Bukhari_Thesis.pdf.

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This thesis develops a detailed conceptual design method and a system software architecture defined with a parametric and generative evolutionary design system to support an integrated interdisciplinary building design approach. The research recognises the need to shift design efforts toward the earliest phases of the design process to support crucial design decisions that have a substantial cost implication on the overall project budget. The overall motivation of the research is to improve the quality of designs produced at the author's employer, the General Directorate of Major Works (GDMW) of the Saudi Arabian Armed Forces. GDMW produces many buildings that have standard requirements, across a wide range of environmental and social circumstances. A rapid means of customising designs for local circumstances would have significant benefits. The research considers the use of evolutionary genetic algorithms in the design process and the ability to generate and assess a wider range of potential design solutions than a human could manage. This wider ranging assessment, during the early stages of the design process, means that the generated solutions will be more appropriate for the defined design problem. The research work proposes a design method and system that promotes a collaborative relationship between human creativity and the computer capability. The tectonic design approach is adopted as a process oriented design that values the process of design as much as the product. The aim is to connect the evolutionary systems to performance assessment applications, which are used as prioritised fitness functions. This will produce design solutions that respond to their environmental and function requirements. This integrated, interdisciplinary approach to design will produce solutions through a design process that considers and balances the requirements of all aspects of the design. Since this thesis covers a wide area of research material, 'methodological pluralism' approach was used, incorporating both prescriptive and descriptive research methods. Multiple models of research were combined and the overall research was undertaken following three main stages, conceptualisation, developmental and evaluation. The first two stages lay the foundations for the specification of the proposed system where key aspects of the system that have not previously been proven in the literature, were implemented to test the feasibility of the system. As a result of combining the existing knowledge in the area with the newlyverified key aspects of the proposed system, this research can form the base for a future software development project. The evaluation stage, which includes building the prototype system to test and evaluate the system performance based on the criteria defined in the earlier stage, is not within the scope this thesis. The research results in a conceptual design method and a proposed system software architecture. The proposed system is called the 'Hierarchical Evolutionary Algorithmic Design (HEAD) System'. The HEAD system has shown to be feasible through the initial illustrative paper-based simulation. The HEAD system consists of the two main components - 'Design Schema' and the 'Synthesis Algorithms'. The HEAD system reflects the major research contribution in the way it is conceptualised, while secondary contributions are achieved within the system components. The design schema provides constraints on the generation of designs, thus enabling the designer to create a wide range of potential designs that can then be analysed for desirable characteristics. The design schema supports the digital representation of the human creativity of designers into a dynamic design framework that can be encoded and then executed through the use of evolutionary genetic algorithms. The design schema incorporates 2D and 3D geometry and graph theory for space layout planning and building formation using the Lowest Common Design Denominator (LCDD) of a parameterised 2D module and a 3D structural module. This provides a bridge between the standard adjacency requirements and the evolutionary system. The use of graphs as an input to the evolutionary algorithm supports the introduction of constraints in a way that is not supported by standard evolutionary techniques. The process of design synthesis is guided as a higher level description of the building that supports geometrical constraints. The Synthesis Algorithms component analyses designs at four levels, 'Room', 'Layout', 'Building' and 'Optimisation'. At each level multiple fitness functions are embedded into the genetic algorithm to target the specific requirements of the relevant decomposed part of the design problem. Decomposing the design problem to allow for the design requirements of each level to be dealt with separately and then reassembling them in a bottom up approach reduces the generation of non-viable solutions through constraining the options available at the next higher level. The iterative approach, in exploring the range of design solutions through modification of the design schema as the understanding of the design problem improves, assists in identifying conflicts in the design requirements. Additionally, the hierarchical set-up allows the embedding of multiple fitness functions into the genetic algorithm, each relevant to a specific level. This supports an integrated multi-level, multi-disciplinary approach. The HEAD system promotes a collaborative relationship between human creativity and the computer capability. The design schema component, as the input to the procedural algorithms, enables the encoding of certain aspects of the designer's subjective creativity. By focusing on finding solutions for the relevant sub-problems at the appropriate levels of detail, the hierarchical nature of the system assist in the design decision-making process.

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Zhang, Jinglan. « Representation, construction, evolution and retrieval of fuzzy shapes to support conceptual design ». Thesis, Queensland University of Technology, 2003.

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Eklund, Adam, et Jesper Karner. « Development of a Framework for Concept Selection and Design Automation : Utilizing hybrid modeling for indirect parametric control of subdivision surfaces ». Thesis, Linköpings universitet, Maskinkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-147755.

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Saab Aeronautics’ section Overall Design and Survivability develops early aircraft concepts and utilizes Computer Aided Design (CAD) to ensure the feasibility of principal- and critical characteristics. Saab has over the years developed several start models of aircrafts in CAD from pre-defined aircraft configurations, which are to some extent non-generic. When new configurations are to be explored, manual- and repetitive work is required if the new configuration cannot be attained solely through parametric modifications of a start model. The complexity of these CAD models also demands great knowledge of how aircraft components interact with each other to ensure compatibility. The project covered in this thesis was thus carried out to develop a more effective way for Saab to create and explore a larger design space. This by creating a framework that consists of a product configurator coupled with a library of generic CAD models. The product configurator that was created is the Saab Tradespace Analyzer & Reconfigurator (STAR), which takes compatibility relationships into consideration to facilitate concept selection. The STAR also provides a dynamic design space calculation to indicate how close the user is to a final concept selection. Two generic CAD models were created, a fuselage model and an air inlet model. A skeleton model was also created in order to reduce model dependencies and to control the main geometry of the aircraft product. In addition to these, an already existing wing model was implemented to form the library of generic CAD models. The framework coupling the STAR with the CAD library utilizes design automation to allow automatic CAD model generation of a concept that has been selected within the STAR. It was concluded through extrapolation that the created framework would allow Saab to create and explore a larger design space in a more effective way than what is done today, provided the library of CAD models were to contain the same number of components as today’s start models.

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Kühn, Carol. « Digital sculpture : conceptually motivated sculptural models through the application of three-dimensional computer-aided design and additive fabrication technologies ». Thesis, [Bloemfontein] : Central University of Technology, Free State, 2009. http://hdl.handle.net/11462/50.

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Meniru, Kenechukwu C. U. « Computer-aided conceptual building design ». Thesis, 2005. http://spectrum.library.concordia.ca/8265/1/NR04053.pdf.

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Decisions made at the early stages of design are critical in relation to the later stages of the building design and construction process. This is becoming more evident as the design process and a variety of building techniques/materials become more complex. Computers are currently ubiquitous in later stages while absent in the earlier design stages which are still dominated by manual techniques. One of the consequences of the situation is the need to translate manual design solutions into a format that can be used by computers at the later stages, thus increasing the probability for errors and incompatibilities. This research project provides a clear description of the early building design process in a way that makes it possible to formulate basic requirements for successfully supporting the process. These basic requirements are then used to compare with existing computer tools in order to determine what is the current available support. An in-depth study, using the technique of protocol analysis, of eight designers during early building design sessions is carried out in order to identify the features that are needed in a computer environment. Specifications are defined based on this study to guide the creation of a system to support the early building design process using computers. The research project formulates concepts for computer-supported early building design and uses these to create a prototype that satisfies a subset of the specifications. This prototype is described and then tested in a way that favorably compares it to a manual design session showing superiority in design management and interpretation of ideas while reducing efforts.

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Ming, Ju Jia, et 朱家明. « Computer Aided Aircraft Conceptual Design ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/81068422926549199935.

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碩士
逢甲大學
機械工程學系
88
Develop a precise and efficiency aircraft design programs are powerful tools for shorten the aircraft design working-hour. Particularly for the process of optimal design and trade study, computer programs offer high-speed and convenient design processes. In this article, programs for the aircraft conceptual design processes will be established. The design process used by this article is base on methods of Raymer、Roskam、Nicolai, and use modules for every design units to buildup the aircraft conceptual design program, CAACD (Computer Aided Aircraft Conceptual Design).Linear regression method was utilized for simplify to inquire about diagrams. And use this concept to buildup the database for program to be suitable for use of more type of aircraft. The program computes aircraft’s static stability and draw the performance diagrams, and by the use of vision design concept, the designed components planform can be drew by input design parameters, this offer intuition design reference. To the support of AASRC (Aeronautical and Astronautical Society of Republic of China) aircraft design competition, we target remote pilot patrol aircraft to be our objective. Preliminary design and manufacture work offer the program to test and verify, and the test of wind tunnel model and propulsion system offer the data for compare with design. The result proved that the program offer more precise and efficient advantages, and could be use for trade study and optimal design for aircraft conceptual design.

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Lin, Ching-Fang, et 林清芳. « Computer-Aided Conceptual Design of Automatic Machines ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/98198175617303642307.

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碩士
國立臺灣大學
機械工程研究所
81
An automatic machine consists of four basic components : mechanism, actuator, sensor, and controller. In the conceptual stage of design,these components must be selected to construct a complete system and to meet design requirements. In this study, a practical and feasible computer-aided method for generating conceptual designs of automatic machine has been developed. This study includes five parts. The first part deals with the practical and general conceptual design requirements. The second part is to identify the characteristics of mechanisms, actuators, sensors and controllers which are frequently used in the automatic machine. 42-mechanisms, 21-actuators, 12-sensors and 4-controllers are categorized and proper computer data-files are prepared for further use. In the third part, rules of selecting basic components and assembling the system are developed. The fourth part is to construct the computer code. The last part isto show some practical examples.

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Kong, Lan. « User interface for computer-aided product conceptual design ». Thesis, 2005. http://spectrum.library.concordia.ca/8728/1/MR14267.pdf.

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A major objective of this research is to develop a natural sketching interface for designers in conceptual design. Based on the literature review on the sketch-based cognitive process, solutions are developed in this thesis to address two major problems that prevent designers from using computer-aided design tools. First , because the lack of a detailed description of a designer's cognitive model, designers have never been put in the centre of consideration in the development of a CAD tool. This thesis proposes a new approach for the exploration of the designer's cognitive model by applying the axiomatic theory of design modeling. Second , the user mental model underlying the existing CAD tools do not match the actual designer's mental model. To eliminate the gap between two mental models, this thesis develops a prototype of natural interface based on PUI (Perceptual User Interface) theory. This natural interface uses gesture commands to replace menu and button. ANN (Artificial Neural Network) is adopted to recognize the designer's gesture commands

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Kurtoglu, Tolga 1976. « A computational approach to innovative conceptual design ». Thesis, 2007. http://hdl.handle.net/2152/3316.

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Conceptual design is a vital part of the design process during which designers first envision new ideas and then synthesize them into physical configurations that meet certain design specifications. In this research, a computational approach is developed to assist the designers perform this non-trivial task of navigating the design space for creating conceptual design configurations. The methodology is based on combining empirical reverse engineering techniques with a graph-grammar approach. Accordingly, design knowledge is systematically extracted from past designs, formulated as procedural grammar rules, and employed in building new design concepts. The implemented system provides a theoretical framework for automatically searching conceptual design spaces and produces novel alternative configurations to real design problems. The application of the approach to the design of various electromechanical devices shows the method's range of capabilities, and how it serves as a comparison to human conceptual design generation and as a tool to complement the skills of a designer.

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Wang, Pin-Hung, et 王斌弘. « A study and Application of Computer Aided Conceptual Design in Architecture Design ». Thesis, 1994. http://ndltd.ncl.edu.tw/handle/97138096338929129548.

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Oh, Ji-Young. « Desktop 3D conceptual design systems / ». 2005. http://wwwlib.umi.com/cr/yorku/fullcit?pNR11609.

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Thesis (Ph.D.)--York University, 2005. Graduate Programme in Computer Science.
Typescript. Includes bibliographical references (leaves 210-216). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pNR11609

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« A STEP TOWARD AN INTELLIGENT AND INTEGRATED COMPUTER-AIDED DESIGN OF APPAREL PRODUCTS ». Thesis, 2016. http://hdl.handle.net/10388/ETD-2016-03-2471.

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An apparel product (or “apparel”) is a human product. The design of an apparel product (or “apparel design”) should share many features of general product design and be conducted with a high degree of systematics and rationality. However, the current practice of apparel design is relatively more experience-based and ad-hoc than it should be. Besides, computer support to apparel design is quite limited in that there are several software systems available for supporting apparel design but they are isolated. Two reasons may explain this above situation: (1) absence of the ontology of apparel and apparel design, and (2) absence of a systematic and rational apparel design process. Furthermore, apparel is a specialized type of product in that all three inherent requirements (i.e., function, comfort related to ergonomics, and pleasure related to aesthetics) are equally important, especially the latter, which creates positive affects in the human wearer. In general, knowledge of how to design an apparel product for pleasure/affects is missing from the current design. The general motivation for the research conducted in this thesis is to locate and articulate this “missing knowledge” in order to advance design technology including computer-aided design for modern apparel products. The specific objectives of the research presented in this thesis are: (1) development of a model for the ontology of apparel or apparel system so that all basic concepts and their relationships related to the apparel system are captured; (2) development of a systematic design process for apparel that captures all the inherent characteristics of design, namely iteration and open-endedness; and (3) development of a computer-aided system for affective design for apparel, whereby human feeling once described can be computed with the result that an apparel product meets the wearer’s “feeling needs” (functional and ergonomic needs are assumed to be satisfied or not the concern of this thesis). There are several challenges to achieving the foregoing objectives. The first of these is the understanding of ontology for apparel and apparel design, given that there are so many types of apparel and ad-hoc apparel design processes in practice. The second challenge is the generalization and aggregation of the various ad-hoc apparel design processes that exist in practice. Third is the challenge presented by imprecise information and knowledge in the aspect of human’s affect. All three above challenges have been tackled and answered in this thesis. The first challenge is tackled with the tool of data modeling especially semantic-oriented data modeling. The second challenge is tackled with the general design theory such as general design phase theory, axiomatic design theory, and FCBPSS knowledge architecture (F: function, C: context, B: behavior, P: principle, SS: state and structure). The third challenge is tacked with the data mining technique and subjective rating technique. Several contributions are made with this thesis. First is the development of a comprehensive ontology model for apparel and apparel design that provides a basis for computer-aided design and manufacturing of apparel in the future. Second is the development of a general apparel design process model that offers a reference model for any specific apparel design process. Third is the provision of new “data mining” technology for acquiring words in human language that express affects. It should be noted that this technology is domain-independent, and thus it is applicable to any other type of product for affective design. The final contribution is the development of a method for searching apparel design parameters which describe an apparel product meeting a wearer’s required feelings described by “feeling words”. The database of words and the algorithm can be readily incorporated into commercial software for computer aided design of apparel products with the new enabler (i.e., design for affect or feeling).

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Ordouei, Mohammad Hossein. « Computer Aided Simulation and Process Design of a Hydrogenation Plant Using Aspen HYSYS 2006 ». Thesis, 2009. http://hdl.handle.net/10012/4431.

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Nowadays, computers are extensively used in engineering modeling and simulation fields in many different ways, one of which is in chemical engineering. Simulation and modeling of a chemical process plant and the sizing of the equipment with the assistance of computers, is of special interests to process engineers and investors. This is due to the ability of high speed computers, which make millions of mathematical calculations in less than a second associated with the new powerful software that make the engineering calculations more reliable and precise by making very fast iterations in thermodynamics, heat and mass transfer calculations. This combination of new technological hardware and developed software enables process engineers to deal with simulation, design, optimization, control, analysis etc. of complex plants, e.g. refinery and petrochemical plants, reliably and satisfactorily. The main chemical process simulators used for static and dynamic simulations are ASPEN PLUS, ASPEN HYSYS, PRO II, and CHEMCAD. The basic design concepts of all simulators are the same and one can fairly use all simulators if one is expert in any of them. Hydrogenation process is an example of the complex plants, to which a special attention is made by process designers and manufacturers. This process is used for upgrading of hydrocarbon feeds containing sulfur, nitrogen and/or other unsaturated hydrocarbon compounds. In oil and gas refineries, the product of steam cracking cuts, which is valuable, may be contaminated by these unwanted components and thus there is a need to remove those pollutants in downstream of the process. Hydrogenation is also used to increase the octane number of gasoline and gas oil. Sulfur, nitrogen and oxygen compounds and other unsaturated hydrocarbons are undesired components causing environmental issues, production of by-products, poisoning the catalysts and corrosion of the equipment. The unsaturated C=C double bonds in dioleffinic and alkenyl aromatics compounds, on the other hand, cause unwanted polymerization reactions due to having the functionality equal to or greater than 2. Hydrogenation process of the undesired components will remove those impurities and/or increase the octane number of aforementioned hydrocarbons. This process is sometimes referred to as “hydrotreating”; however, “upgrader” is a general word and is, of course, of more interest. In this thesis, a hydrogenation process plant was designed on the basis of the chemistry of hydrocarbons, hydrogenation reaction mechanism, detailed study of thermodynamics and kinetics and then a steady-state simulation and design of the process is carried out by ASPEN HYSYS 2006 followed by design evaluation and some modifications and conclusions. Hydrogenation reaction has a complicated mechanism. It has been subjected to hot and controversial debates over decades. Many kinetic data are available, which contradict one another. Among them, some of the experimental researches utilize good assumptions in order to simplify the mechanism so that a “Kinetic Reaction” modeling can be employed. This thesis takes the benefit of such research works and applies some conditions to approve the validity of those assumptions. On the basis of this detailed study of reaction modeling and kinetic data, a hydrogenation plant was designed to produce and purify over 98 million kilograms of different products; e.g. Benzene, Toluene, Iso-octane etc. with fairly high purity.

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Lu, Shan. « Enforcing ontological rules in conceptual modeling using UML : principles and implementation / ». 2005.

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Onkar, Prasad S. « Development of 2D and 3D Sketching Environment to Support Early Phases of Design ». Thesis, 2013. http://etd.iisc.ernet.in/2005/3362.

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The traditional pen-paper sketching is extensively used in the early stages of product design as it supports creative exploration of product concepts and provides a fluidic mode for the expression of ideas. The Computer Aided Design (CAD) models support the later stages of design and manufacturing process. Faithful conversion of the designer’s ideas from concept sketches to the CAD models is a skill intensive and time consuming exercise which reduces the overall productivity of the organization. Providing computer based support can help the designer, in several ways, by reducing demand on the skill and allow focusing more on creative exploration of the concepts. Towards that, the thesis presents methodologies to understand the product concept sketches, support cognitive activities like perceiving the composition and behaviour, and create and interact with the sketches, directly in 3D. To begin with, traditional 2D sketches of product concepts are studied mainly to explores the psychological (cognitive) and physiological (musculoskeletal) activities of the designer in the context of the product being designed. A sketching application is created for capturing the sketches created using a tablet in digitized form. The captured data is analyzed based on the identified parameters. A grouping methodology is devised to group the stroke based on the observations which are akin to Gestalt laws of perceptual organization. This functional grouping or segmentation is used to identify the mental model of the product concept and the design rationale behind it. In concept sketches, annotations carry information like behaviour, functionality and usage. These wishful declarations need to be verified through simulation! To simulate the behavior of the components identified by the functional segmentation method, a kinematic model is defined where the designers interactively describe the constituents like joints, fixed links, inputs, etc. The interactive simulation changes the underlying kinematic model and makes the sketches to move to show the behavior. This system also provides methods to verify boundary constraints and allows creating patterns. Traditional 2D sketching suffers from several deficiencies. To overcome these, a novel direct 3D sketching methodology is proposed with stereo vision and haptic feedback. Different types of strokes creations like curves, strips and sweep surfaces, directly in 3D space, are demonstrated. Further, to provide control over stroke creation process, visual and haptic feedbacks are studied. Haptic rendering schemes for stroke generation are explored based on mechanics of sketching. Using the curve generation methods, surface generation schemes are devised. Mainly two types of schemes are explored (a) sweep surface and (b) Hatching surfaces. To support constrained concept exploration, two types of haptic constraints are modeled and their application is demonstrated in constraining a sketch within a boundary and outside a boundary. Motion constraints are implemented by simulating the behaviour of identified components’ motions. Two types of motion are implemented (a) Linear translation and (b) Rotation about an axis. Finally, a sketch based distributed collaboration method is presented to enable design interaction in the context of global product development. Several issues related to the realization of a sketch based collaborative conceptual design system are explored and, one such instance is demonstrated through experiments.

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PALAI, MATTEO. « TECNICHE E METODI PER L’AUTOMAZIONE DEL PROCESSO DI TRADUZIONE DEI DISEGNI TECNICI DI STILE IN GEOMETRIE TRIDIMENSIONALI DI TIPO “FREE-FORM” ». Doctoral thesis, 2013. http://hdl.handle.net/2158/806703.

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