The aim of this study is to design a computer interface, which links the user to commercial Finite Element Analysis (FEA) program, MSC.Marc-Mentat to make automatic FE analysis of an excavator boom by using DELPHI as platform. Parametrization of boom geometry is done to add some flexibility to interface called OPTIBOOM. Parametric FE analysis of a boom shortens the design stages and helps to find the optimum design in terms of stresses and mass.

Optimum design of multistep gearbox, since many high-performance power transmission applications (e.g., automotive, space industry) require compact volume, has become an important interest area. This design application includes more complicated problems that are not taken into account while designing single stage gear drives. Design applications are generally made by trial and error methods depending on the experience and the intuition of the designer. In this study, using Visual Basic 6.0, an interactive program is developed for designing multistep involute standard and nonstandard spur gearbox according to the American Gear Manufacturers Association (AGMA) Standards 218.01 and 2001- B88. All the equations for calculating the pitting resistance geometry factor I, and the bending strength geometry factor J, are valid for external spur gears that are generated by rack-type tools (rack cutters or hobs). The program is made for twostage to six-stage gear drives, which are commonly used in the industry. Compactness of gear pairs and gearbox, and equality of factor of safety against bending failure is taken as the design objective. By considering the total required gear ratio, the number of reduction stages is input by the user. Gear ratios of every stage is distributed to the stages according to the total gear ratio that satisfies the required precision (from &plusmn / 0.1 to &plusmn / 0.00001 on overall gear ratio) depending on the user selected constraints (unequal gear ratio for every stage, noninteger gear ratio e.g.). Dimensional design is determined by considering bending stress, pitting stress, and involute interference constraints. These steps are carried out iteratively until a desirable solution is acquired. The necessary parameters for configuration design such as number of teeth, module, addendum modification coefficient, are selected from previously determined gear pairs that satisfies the constraints by user interaction considering the performance criterion from the developed program. The positions of gears and shafts are determined automatically in order to keep the volume of gearbox as minimum while satisfying the nonlinear spatial constraints (center distance constraint for proper meshing of gear pairs, face distance constraint for proper assembly of pinion and gear having same shaft, gear interference constraint for preventing interferences between gears, shaft interference constraint for preventing interferences between gears and shafts) by using DLL (Dynamic Link Library) technology of Lingo 8.0 optimization software together with Visual Basic 6.0. If shaft interference constraint is removed then cantilevered mounting of gear pairs would also be possible, otherwise the gears should be mounted between bearings. Visual output of assembly is made by using Autodesk Inventor 7.0, automatically by the program.

Thesis (PhD) -- University of Western Sydney, 2003. / A thesis submitted to the University of Western Sydney in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Includes references pp.191 - 202, and appendices.

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 296-300).

A seleção de componentes mecânicos não é uma tarefa fácil e exige um substancial know-how e experiência. As ferramentas atuais trabalham de forma isolada umas das outras, além disto não levam em consideração os requisitos que a interface de um componente exige do outro onde se acoplará, e por consequência os custos de fabricação e logísticos envolvidos para a compatibilização das interfaces. Para auxiliar neste processo está sendo proposto um método para desenvolver um SE (Sistema Especialista) para a seleção de componentes mecânicos que além de levar em conta os requisitos de aplicação, também considera no processo de seleção as deficiências supracitadas. Outro aspecto é que, leva em conta as diretrizes do projeto e os recursos de fabricação da planta, e em paralelo ao processo de seleção também pode dimensionar os componentes selecionados e as interfaces das peças nas quais se acoplarão. O processo de aquisição do conhecimento é uma das principais etapas de desenvolvimento de um SE é considerado como um dos estágios mais importantes em sua execução. Em função disto está sendo proposto um método alternativo que permite que o conhecimento seja adquirido de forma sistemática e organizada pelo engenheiro do conhecimento e pelo especialista para o seu emprego na construção da base de dados do SE. O SE desenvolvido com base no método de aquisição de conhecimento proposto neste trabalho é validado através de dois casos exemplo, inseridos em um projeto de uma máquina de processamento de papel. A validação se dá através da análise de especialistas quanto à adequação dos componentes selecionados pelo SE, comparando-os com o projeto atual. Como resultado, observa-se uma substancial redução dos custos de projeto em função dos componentes selecionados, além da economia no tempo gasto pelos projetistas neste processo de seleção. / Selecting mechanical components is not an easy task and requires a substantial amount of knowledge and experience. The current component selecting tools do not work in an integrated manner, not taking into account component interface requirements for coupling it to another component and, consequently, not considering manufacturing and logistic costs for the interfaces compatibility. In order to improve this process, this thesis proposes a method for the development of an ES (Expert System) for mechanical components selection, which considers both application and component interface requirements. Additionally, the ES will also take into consideration design guidelines and the manufacturing plant capabilities, so it will also be able to scale the selected components and its interfaces. The process of knowledge acquisition is one of the main stages of the ES development and is considered as one of the most important stages in its execution. As a result of this, an alternative method is proposed that allows the knowledge to be acquired in a systematic and organized way by the knowledge engineer and the specialist for its use in the construction of the ES database. The ES developed based on the proposed knowledge acquisition method is validated through two case studies in a paper processing machine design. The validation is done through the analysis of experts regarding the suitability of the components selected by the ES, comparing them with the current project. As a result, there is a substantial reduction in design costs due to the selected components, as well as the savings in the time spent by the designers in this selection process.

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The goal of this diploma thesis is designing a medium-sized security x-ray machine used predominantly for screening cabin luggage and middle-sized parcels. The introductory section of the thesis concentrates on general overview of the whole field through analyses of the design and technical parameters of typical products. The latter part of the thesis is concentrated on the designing a new product using the knowledge base and information obtained within the research. The final product is designed with respect to ergonomic and technical requirements, nevertheless it represents a new perspective on the topic.

The subject of this diploma thesis is the design of a coffee machine. The design focuses on a professional automatic high-load coffee machine intended for use in dayrooms and meeting rooms of companies. The final proposal should meet all constructional, technological, aesthetic and ergonomic requirements. The aim of the thesis is to design a coffee machine following the expected requirements while the visual appearance and functionality of the device corresponds to the individual needs of its users and operators.

The topic of this master’s thesis is design of a medical ultrasound diagnostic machine. The thesis focuses on a new perspective on composition and shaping of the ultrasound machine while respecting technical and ergonomic requirements. The goal of this thesis is addition of an aesthetic value and incorporation of new technologies so the product is able to compete on the current market.