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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

Reservatórios metálicos elevados para aplicação na área de processos da indústria sucro-alcooleira / Elevated steel tanks used in sugar and alcohol industry processes area

Badiale, Renato Celini 15 December 1997 (has links)
Em doze anos de atuação profissional no desenvolvimento de projetos específicos para a indústria sucro-alcooleira, observou-se a pouca informação encontrada para o projeto de equipamentos utilizados neste setor, sendo de grande utilidade aos profissionais que nele atuam, algo introdutório, para auxiliar na análise estrutural de reservatórios metálicos elevados utilizados na fabricação de açúcar e álcool. Objetivou-se, utilizar a teoria de estruturas em casca de revolução e programa \"comercial\" de análise de estruturas por elementos finitos, como ferramentas, no cálculo estrutural de cascas cilíndrica e cônica que compõem um equipamento com dimensões \"típicas\" utilizadas na área de processos da indústria sucro-alcooleira. O estudo de forma comparativa com o método dos elementos finitos permitiu calibrar a solução teórica aproximada desenvolvida. As equações obtidas, para cascas cilíndricas e cônicas com bordas engastadas ou apoiadas fixas sob a ação de pressão hidrostática, podem ser utilizadas para prever o seu comportamento estrutural, desde que observadas hipóteses e recomendações básicas. Mesmo distantes da simulação do comportamento real das cascas, já que em campo, encontram-se inúmeros outros parâmetros não considerados neste trabalho, procurou-se apresentar um melhor esboço do comportamento estrutural das mesmas com equacionamento acessível aos engenheiros não acadêmicos envolvidos com problemas de projeto estrutural. / In twelve years of professional performance in the development of specific projects for the sugar and alcohol industry, the little information for equipments used in this sector design was observed, and it would be of great usefulness to the design engineers of this area, something introductory in the structural analysis of elevated steel tanks used in the production of sugar and alcohol. This work had as objective to use the shell of revolution theory and \"commercial\" programs for finite element analysis of structures, as tools, in the calculation of cylindrical and conical shells that compose a typical \"dimensions\" equipment used in the sugar industry processes area. The study in a comparative way with the finite elements method allowed to gauge the approximate theoretical solution developed. The equations developed for cylindrical and conical shells with fixed or supported borders under liquid pressure action, can be used to anticipate the structural behavior of the same ones, since fundamental hypotheses and basic recommendations wil have observed. In spite o f far from the real behavior simulation of the shells, because of the countless others in field parameters existence and that had not considered in this work, we tried to present a better sketch of the structural behavior of the shells with useful equations for the non academics\' engineers involved with structural design problems.
2

Reservatórios metálicos elevados para aplicação na área de processos da indústria sucro-alcooleira / Elevated steel tanks used in sugar and alcohol industry processes area

Renato Celini Badiale 15 December 1997 (has links)
Em doze anos de atuação profissional no desenvolvimento de projetos específicos para a indústria sucro-alcooleira, observou-se a pouca informação encontrada para o projeto de equipamentos utilizados neste setor, sendo de grande utilidade aos profissionais que nele atuam, algo introdutório, para auxiliar na análise estrutural de reservatórios metálicos elevados utilizados na fabricação de açúcar e álcool. Objetivou-se, utilizar a teoria de estruturas em casca de revolução e programa \"comercial\" de análise de estruturas por elementos finitos, como ferramentas, no cálculo estrutural de cascas cilíndrica e cônica que compõem um equipamento com dimensões \"típicas\" utilizadas na área de processos da indústria sucro-alcooleira. O estudo de forma comparativa com o método dos elementos finitos permitiu calibrar a solução teórica aproximada desenvolvida. As equações obtidas, para cascas cilíndricas e cônicas com bordas engastadas ou apoiadas fixas sob a ação de pressão hidrostática, podem ser utilizadas para prever o seu comportamento estrutural, desde que observadas hipóteses e recomendações básicas. Mesmo distantes da simulação do comportamento real das cascas, já que em campo, encontram-se inúmeros outros parâmetros não considerados neste trabalho, procurou-se apresentar um melhor esboço do comportamento estrutural das mesmas com equacionamento acessível aos engenheiros não acadêmicos envolvidos com problemas de projeto estrutural. / In twelve years of professional performance in the development of specific projects for the sugar and alcohol industry, the little information for equipments used in this sector design was observed, and it would be of great usefulness to the design engineers of this area, something introductory in the structural analysis of elevated steel tanks used in the production of sugar and alcohol. This work had as objective to use the shell of revolution theory and \"commercial\" programs for finite element analysis of structures, as tools, in the calculation of cylindrical and conical shells that compose a typical \"dimensions\" equipment used in the sugar industry processes area. The study in a comparative way with the finite elements method allowed to gauge the approximate theoretical solution developed. The equations developed for cylindrical and conical shells with fixed or supported borders under liquid pressure action, can be used to anticipate the structural behavior of the same ones, since fundamental hypotheses and basic recommendations wil have observed. In spite o f far from the real behavior simulation of the shells, because of the countless others in field parameters existence and that had not considered in this work, we tried to present a better sketch of the structural behavior of the shells with useful equations for the non academics\' engineers involved with structural design problems.
3

Semi Analytical Study Of Stress And Deformation Analysis Of Anisotropic Shells Of Revolution Including First Order Transverse Shear Deformation

Oygur, Ozgur Sinan 01 September 2008 (has links) (PDF)
In this study, anisotropic shells of revolution subject to symmetric and unsymmetrical static loads are analysed. In derivation of governing equations to be used in the solution, first order transverse shear effects are included in the formulation. The governing equations can be listed as kinematic equations, constitutive equations, and equations of motion. The equations of motion are derived from Hamilton&rsquo / s principle, the constitutive equations are developed under the assumptions of the classical lamination theory and the kinematic equations are based on the Reissner-Naghdi linear shell theory. In the solution method, these governing equations are manipulated and written as a set called fundamental set of equations. In order to handle anisotropy and first order transverse shear deformations, the fundamental set of equations is transformed into 20 first order ordinary differential equations using finite exponential Fourier decomposition and then solved with multisegment method of integration, after reduction of the two-point boundary value problem to a series of initial value problems. The results are compared with finite element analysis results for a number of sample cases and good agreement is found. Case studies are performed for circular cylindrical shell and truncated spherical shell geometries. While reviewing the results, effects of temperature and pressure loads, both constant and variable throughout the shell, are discussed. Some drawbacks of the first order transverse shear deformation theory are exhibited.

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