This thesis provides an approach to use feature modeling with a set of guidelines for requirements definition and decomposition activities of the axiomatic design methodology. A tool that supports the development of feature models and modeling of the Axiomatic Design activities is implemented to be utilized for guiding the designer. Axiomatic Design suggested four domains of information in the transformation of the problem definition to the solution, and provided mechanisms for supporting the mapping among some of those domains. The approach suggested in this thesis fills an important gap, which is the transition from the customer needs to functional requirements, in axiomatic design. A case study is carried out in order to analyze advantages and disadvantages of the proposed approach.

In this research, component oriented development is supported with design guidance by extending the Axiomatic Design Theory for component orientation, and utilizing domain engineering and ontology mechanisms. Guidance is offered in the form of suggesting missing components and discovering incompatibilities among the candidate elements of software development, corresponding to different phases such as requirement analysis, design, and implementation. A mature domain concept is developed suggesting the availability of reference models for customer needs, software system requirements, software design, and also a rich set of implemented components. As the system is being defined starting with the customer needs and progressing towards components, at every step the developer is presented what is available in the domain and what becomes unavailable. This guidance is based on the selections made so far, utilizing ontology based constraint checking. Feature Models are incorporated for modeling customer needs. Case studies are presented for demonstration purposes.

This research combines the methodology proposed in Axiomatic Design Theory (ADT) with a service oriented decomposition approach for systematic development of Service Oriented Architecture compliant systems. A previous study had applied ADT to component oriented development where simultaneous specification and decomposition of models related to requirements, design, product domain, and components were supported. Recently, Web services have gained popularity and they became a more desired alternative to components. This research sets the foundation for service-oriented modeling and development with ADT support through enhancing the component oriented work conducted before. The goal is to be able to consider customer needs viewed in the domain context, together with the requirements and design so that efficient development can take place based on existing Web services. The system under development is viewed as a hierarchy of process models where leaf-level processes correspond to Web services.

Design theories and methodologies are guidelines to develop design solutions. Among many, the Axiomatic design theory (ADT) and Systematic design procedures (SDP) are two well-known approaches to design. For practical applications, the choice of the design methodology is difficult as there is no study to compare them. To close in such gap in literature, this thesis presents a study on comparison of these two design approaches. To facilitate the comparison, design of a solid state fermenter was taken as a vehicle. The fermenter chosen for this study is was used for detoxification of phorbol esters from Jatropha curcas. Jatopha curcas is a woody plant and is one of the major sources for the production of bio-diesel as it is readily available and has unique composition. Processing Jatopha curcas for biodiesel also yields protein rich Jatopha curcas seed cake. This can be used as animal feedstock, cattle fodder or live feed stock. It is however known that phorbol esters present in the seed cake hinder the utilization of the seed cake as live feed stock. Solid state fermentation by fungi is an effective process to denature phorbol esters, which has been demonstrated at the laboratory scale. Development of an industrial scale solid state fermenter (SSF) is necessary. This study applies SDP and ADT the same deign problem of SSF and compared based on the result of the design. It is noted that in ADT, the evaluation of design alternatives neither considers the cost of the system under design nor the delivery time of the system, but SDP does. To make the comparison on the same ground, an extension of ADT enabling it to consider the cost and delivery time (or time) was developed. Several conclusions can be drawn from this study and they are: (1) ADT and SDP are complementary to each other and the one that integrates both is more effective to design; (2) The essence of Axiom 2 of ADT is to evaluate design alternatives with all factors that lead to difficulty to realize the design, but unfortunately the information content in the current ADT literature only considers the functional or quality aspect; (3) Previous reports suggest the presence of zigzag process only in ADT, However in this study it is evident that SDP exercises the zigzag process as well; (4) the proposed formulation of information content by taking into consideration of the quality, cost, time aspects is more effective in design practice as quite often the cost and time are very important aspects to the customer. The contribution of this thesis study is of two-fold. First, the SSF designed in this study is a pilot one in the field of the biochemical process and it has potential to be implemented. Second, this study concludes several unique findings of ADT and SDP with their relationship, which have further resulted in an integrated ADT and SDP design approach and a more complete formulation of information content capable of evaluating design alternatives from all aspects rather than the functional aspect only.

Orientador: Franco Giuseppe Dedini / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-05T16:15:48Z (GMT). No. of bitstreams: 1 LombardiJunior_ArleydeBarros_D.pdf: 5366373 bytes, checksum: 0982b8d5bebb123f92dc4438f65e3f2c (MD5) Previous issue date: 2005 / Resumo: Esta tese consiste no desenvolvimento de estratégias de controle para o sistema de motorização servo assistido para cadeirantes. O sistema combina as vantagens do sistema de propulsão motorizado como aumento da acessibilidade e mobilidade com as vantagens do sistema manual que é o aumento da capacidade muscular e cardiovascular. Este sistema de motorização atua somente quando a força de propulsão exercida pelo usuário é superior à um determinado limite, o que evita o desenvolvimento de lesão por esforço repetitivo. Metodologicamente foi definido um modelo biomecânico para análise dos esforços do ciclo de propulsão aliado a um modelo dinâmico do sistema para análise e simulação das rotinas de controle propostas. Para geração das estratégias de controle utilizou-se a metodologia de projeto axiomático integrado as estruturas de controle de sistemas multi-agentes, sistemas subsumption e lógica nebulosa. As rotinas foram testadas no modelo dinâmico onde foi possível determinar sua eficiência. Finalizando o processo de concepção do sistema de controle foi construído um programa para simulação do mesmo e um protótipo em escala controlado por este programa. Concluindo o trabalho apresenta o primeiro desenvolvimento de controle para motorização servo assistida e também a primeira utilização de metodologia de projeto axiomático para desenvolvimento de estratégias de controle / Abstract: The aim of this dissertation is to develop control strategies for servo-assisted motorization. The system brings the power wheelchair advantages because it increases the accessibility and mobility, but it also brings manual wheelchair advantage that is the opportunity to increase the muscular and cardiovascular capacity. Thus the servo assisted wheelchair is a therapeutic wheelchair which allows the user increases his physical and pulmonary capacity without risk of injury for repetitive effort. The motorization only turns on when the propulsion force applied by the user is higher than a specific value. Methodologically was defined a biomechanical model for analysis of the efforts during the propulsion cyc1e. This model was associated with a wheelchair dynamic model. The new model allows the analysis and simulation of the control strategies proposed. For control strategies generation it was used methodology axiomatic design integrated with the structures of multi-agents control systems, subsumption systems and fuzzy logic. The strategies had been tested using the dynamic model and it was possible to determine its efficiency. It was developed a program for mathematical simulation and a prototype controlled by this program for testing some results. Conc1uding the work presents the first development for control of servo assisted motorization and it is the first application of axiomatic design methodology for control strategies development / Doutorado / Mecanica dos Sólidos e Projeto Mecanico / Doutor em Engenharia Mecânica

Orientador: Roseana da Exaltação Trevisan / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-12T19:13:48Z (GMT). No. of bitstreams: 1 Inglez_LuisFelipe_M.pdf: 2430907 bytes, checksum: 2ff762a89795106a40225f7d705b1d6f (MD5) Previous issue date: 2008 / Resumo: Apesar de todos os avanços tecnológicos, o desenvolvimento de projeto, na grande maioria das vezes, ainda é executado de forma interativa, empírica e intuitiva, baseado unicamente na experiência, inteligência ou criatividade dos engenheiros. O desenvolvimento de processo e máquinas para solda em plástico de tanques de combustível soprados não é exceção. Assim como na fase de desenvolvimento, a alteração ou correção de um projeto já existente também é realizada de forma empírica. Visando identificar as falhas de projeto de um processo de solda existente e orientar ações de correção e melhoria, o autor deste estudo utilizou uma metodologia de desenvolvimento sistêmico de projeto, no caso o Axiomatic Design, como uma ferramenta de análise. Para tanto, ele coordenou a construção da matriz de design do processo estudado para identificar os acoplamentos existentes. Num segundo momento, baseando-se nos documentos de controle de produção diário do período de 2005 a 2007, buscou-se estimar os valores anuais do conteúdo de informação deste sistema (Isys). A correção ou melhoria dos acoplamentos que obtivessem as menores eficiências no ano de 2005 foi priorizada. O cálculo dos valores de conteúdo de informação dos anos de 2006 e 2007 visou avaliar a eficácia do método proposto. Os resultados destes cálculos comprovaram que o projeto axiomático pode ser utilizado como ferramenta de análise. / Abstract: Despite all technological and scientific breakthroughs, design is being done empirically on a trial-and-error basis, depending on intuitive and innate reasoning rather than a rigorous scientific study. Design of welding machines for fuel plastic tanks is no exception. Refurbishment and corrective maintenance tasks are also made without any scientific basis. This work intended to demonstrate the use of axiomatic design as an analytic tool for an existent machine design in use on the shop floor. Based on the literature review about Axiomatic Design and Plastic Welding, the author determined the design matrix of an existent fuel tank welding machine, identifying the coupled elements. Moreover, based on production data from 2005 to 2007, the information content (Isys) of this machine was evaluated. The correction or improvement of design parameters with low information content values in 2005 was prioritized. In order to validate the efficacy of using axiomatic design as an analytic tool, the information content values of 2006 and 2007 were evaluated. The result proves that axiomatic design can be used as an analytical tool. / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

The continuing trends of miniaturisation, mass customisation, globalisation and wide use of the Internet have great impacts upon manufacturing in the 21st century. Micro manufacturing will play an increasingly important role in bridging the gap between the traditional precision manufacturing and the emerging technologies like MEMS/NEMS. The key requirements for micro manufacturing in this context are hybrid manufacturing capability, modularity, reconfigurability, adaptability and energy/resource efficiency. The existing design approaches tend to have narrow scope and are largely limited to individual manufacturing processes and applications. The above requirements demand a fundamentally new approach to the future applications of micro manufacturing so as to obtain producibility, predictability and productivity covering the full process chains and value chains. A novel generic modular reconfigurable platform (GMRP) is proposed in such a context. The proposed GMRP is able to offer hybrid manufacturing capabilities, modularity, reconfigurablity and adaptivity as both an individual machine tool and a micro manufacturing system, and provides a cost effective solution to high value micro manufacturing in an agile, responsive and mass customisation manner. An integrated framework has been developed to assist the design of GMRPs due to their complexity. The framework incorporates theoretical GMRP model, design support system and extension interfaces. The GMRP model covers various relevant micro manufacturing processes and machine tool elements. The design support system includes a user-friendly interface, a design engine for design process and design evaluation, together with scalable design knowledge base and database. The functionalities of the framework can also be extended through the design support system interface, the GMRP interface and the application interface, i.e. linking to external hardware and/or software modules. The design support system provides a number of tools for the analysis and evaluation of the design solutions. The kinematic simulation of machine tools can be performed using the Virtual Reality toolbox in Matlab. A module has also been developed for the multiscale modelling, simulation and results analysis in Matlab. A number of different cutting parameters can be studied and the machining performance can be subsequently evaluated using this module. The mathematical models for a non-traditional micro manufacturing process, micro EDM, have been developed with the simulation performed using FEA. Various design theories and methodologies have been studied, and the axiomatic design theory has been selected because of its great power and simplicity. It has been applied in the conceptual design of GMRP and its design support system. The implementation of the design support system is carried out using Matlab, Java and XML technologies. The proposed GMRP and framework have been evaluated through case studies and experimental results.

Fixtures accurately locate and secure a part during machining operations such that the part can be manufactured to design specifications. To reduce the design costs associated with fixturing, various computer-aided fixture design (CAFD) methods have been developed through the years to assist the fixture designer. Much research has been directed towards developing systems that determine an optimal fixture plan layout, but there is still a need to develop a CAFD method that can continue to assist designers at the unit level where the key task is identifying the appropriate structure that the individual units comprising a fixture should take. This research work details the development of a CAFD methodology (called CAFixD) that seeks to fill this hole in the CAFD field. The approach taken is to consider all operational requirements of a fixture problem, and use them to guide the design of a fixture at the unit level. Based upon a case-based reasoning (CBR) methodology where relevant design experience is retrieved and adapted to provide a new fixture design solution, the CAFixD methodology adopts a rigorous approach to indexing design cases in which axiomatic design functional requirement decomposition is adopted. Thus, the design requirement is decomposed in terms of functional requirements, physical solutions are retrieved and adapted for each individual requirement, and the design re-constituted to form a complete fixture design. Case adaptation knowledge is used to guide the retrieval process. Possible adaptation strategies for modifying candidate cases are identified and then evaluated. Case and adaptation strategy combinations that result in adapted designs that best satisfy the preferences of the designer are used as the final design solutions. Possible means of refining the effectiveness of the method include combining adaptation strategies and considering the order in which design decisions are taken.

The aesthetic aspect of a functional product is growing to be an important reason for the consumers choice to buy the product. Despite this importance, aesthetics has not generally been incorporated into engineering design which makes much sense of functional and ergonomic designs. The study presented in this thesis aims to remedy this observed gap. The study focuses on the integration of aesthetic attributes with functional attributes of a product and on the quantification of the aesthetic principle from fine arts into design variables of the product. In particular, two hypotheses underlie this study: (1) design variables can be classified in terms of their relevance to functional, ergonomic, and aesthetic attributes, and (2) a particular aesthetic principle, namely visual balance, helps to achieve an improved aesthetic product.<p>The cell phone is used to ground this study. A statistic experiment using the cell phone product positively tests the first hypothesis, resulting in two design variable which are only related to the aesthetic attribute of the cell phone product. The study of the visual balance principle results in a more general formula which relates design variables to visual balance with consideration of both geometry and color of the cell phone product. Finally, another statistic experiment is designed, which positively tests the second hypothesis.<p>This study concludes: (1) the effective integration of aesthetics with function and ergonomics requires an analysis and classification of design variables, and (2) there is a potential to quantify all aesthetic principles from fine arts into design variables.

The aesthetic aspect of a functional product is growing to be an important reason for the consumers choice to buy the product. Despite this importance, aesthetics has not generally been incorporated into engineering design which makes much sense of functional and ergonomic designs. The study presented in this thesis aims to remedy this observed gap. The study focuses on the integration of aesthetic attributes with functional attributes of a product and on the quantification of the aesthetic principle from fine arts into design variables of the product. In particular, two hypotheses underlie this study: (1) design variables can be classified in terms of their relevance to functional, ergonomic, and aesthetic attributes, and (2) a particular aesthetic principle, namely visual balance, helps to achieve an improved aesthetic product.<p>The cell phone is used to ground this study. A statistic experiment using the cell phone product positively tests the first hypothesis, resulting in two design variable which are only related to the aesthetic attribute of the cell phone product. The study of the visual balance principle results in a more general formula which relates design variables to visual balance with consideration of both geometry and color of the cell phone product. Finally, another statistic experiment is designed, which positively tests the second hypothesis.<p>This study concludes: (1) the effective integration of aesthetics with function and ergonomics requires an analysis and classification of design variables, and (2) there is a potential to quantify all aesthetic principles from fine arts into design variables.