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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desenvolvimento de um n?cleo vers?til e integrado de ferramentas CAD/CAE para a modelagem e simula??o de pe?as mec?nicas

Silva, Luzin?rio Gomes da 05 March 2012 (has links)
Made available in DSpace on 2014-12-17T14:58:15Z (GMT). No. of bitstreams: 1 LuzinarioGS_DISSERT.pdf: 1489197 bytes, checksum: c6a09807d24f35bd75cfbad03d10f90b (MD5) Previous issue date: 2012-03-05 / Currently there is still a high demand for quality control in manufacturing processes of mechanical parts. This keeps alive the need for the inspection activity of final products ranging from dimensional analysis to chemical composition of products. Usually this task may be done through various nondestructive and destructive methods that ensure the integrity of the parts. The result generated by these modern inspection tools ends up not being able to geometrically define the real damage and, therefore, cannot be properly displayed on a computing environment screen. Virtual 3D visualization may help identify damage that would hardly be detected by any other methods. One may find some commercial softwares that seek to address the stages of a design and simulation of mechanical parts in order to predict possible damages trying to diminish potential undesirable events. However, the challenge of developing softwares capable of integrating the various design activities, product inspection, results of non-destructive testing as well as the simulation of damage still needs the attention of researchers. This was the motivation to conduct a methodological study for implementation of a versatile CAD/CAE computer kernel capable of helping programmers in developing softwares applied to the activities of design and simulation of mechanics parts under stress. In this research it is presented interesting results obtained from the use of the developed kernel showing that it was successfully applied to case studies of design including parts presenting specific geometries, namely: mechanical prostheses, heat exchangers and piping of oil and gas. Finally, the conclusions regarding the experience of merging CAD and CAE theories to develop the kernel, so as to result in a tool adaptable to various applications of the metalworking industry are presented / Com o crescimento das exig?ncias do controle de qualidade na fabrica??o de pe?as mec?nicas, surgiu a atividade de inspe??o de produtos finais, que vai desde a an?lise dimensional ? composi??o qu?mica. Essa tarefa geralmente ? feita atrav?s de diversos m?todos de ensaios n?o destrutivos que minimizam a possibilidade de falhas das pe?as. Os resultados produzidos pelas ferramentas utilizadas nas inspe??es n?o s?o capazes de definir geometricamente um dano (trincas, microtrincas, defeitos de fabrica??o etc.) e, portanto, n?o s?o adequados para a visualiza??o na tela de um computador. Na verdade, t?cnicas de visualiza??o de objetos virtuais em 3D s?o capazes de identificar certos danos que dificilmente seriam detectados por outros m?todos tradicionais. Existem alguns softwares comerciais que buscam auxiliar as etapas de um projeto e simula??o de pe?as mec?nicas no intuito de prever poss?veis danos para tentar mitigar poss?veis eventos indesej?veis (rompimento de pe?as, quebra de equipamentos etc.). Entretanto, o desafio do desenvolvimento de softwares capazes de integrar as v?rias atividades de projeto, inspe??o de produtos, resultados de ensaios n?o destrutivos e simula??es de danos ainda precisa da aten??o de pesquisadores. Dessa forma, fez-se um estudo metodol?gico para a elabora??o de um kernel (n?cleo computacional) piloto do tipo CAD/CAE de grande versatilidade, capaz de auxiliar programadores no desenvolvimento de softwares que usam Engenharia Reversa como base aplicados ?s atividades de projeto e simula??o de casos em que pe?as mec?nicas s?o submetidas a solicita??es diversas. A cria??o do kernel deu-se atrav?s da aplica??o da Computa??o Gr?fica em conjunto com as teorias CAD e CAE e com o aux?lio da realidade virtual. Nesta disserta??o apresentam-se resultados em que o kernel desenvolvido foi aplicado com sucesso a estudos de casos de pe?as com geometrias espec?ficas, a saber: pr?teses mec?nicas, trocadores de calor e tubula??es de petr?leo e g?s. Finalmente, s?o apresentadas as conclus?es referentes ? experi?ncia da hibridiza??o das teorias CAD e CAE para o desenvolvimento do kernel, de forma a resultar numa ferramenta adapt?vel ?s mais diversas aplica??es da ind?stria metal-mec?nica

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