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Showing 1 to 20 of 26 for “"Análise dinâmica"”.
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Análise dinâmica das vigas sandwich comprimidas
The problem undertaken is this work is to determine and analyze the equations of lateral vibrations of sandwich beams with an axial compressive load, as well as the analysis of the instability loads by a dynamic method. Some cases, corresponding to several boundary conditions, were studied and the …
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Análise dinâmica de estrutura flexível em meio fluido
A hydroelastic reduced model of one of the tall and flexible legs of a jack-up platform is used for investigation of the effects of large amplitude displacements, and fluidstructure interaction on its dynamic behaviour and on the structural and hydrodynamic damping factors. It is shown that this …
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Análise dinâmica não-linear de sistemas rígido-flexíveis
In the analysis of interaction problems is advantageous to treat each region by implicit or explicit algorithms implemented in the same computational program. The objective of the present work is to study a mixed time integration algorithm applied to non-linear problems. The explicit integration is …
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Alguns aspectos da análise dinâmica de estruturas offshore
The present work deals with the Deterministic Dynamic Analysis of Offshore Structures, by the: - Frequency Response Method; - Direct Integration Method. A study was done trying to identify the basic problems in order to make certain simplifications. These producted a better computacional …
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Análise dinâmica de placas sandwich comprimidas simplesmente apoiadas
The scope of this dissertation is the analysis of the dynamical behavior of sandwich plates. We have considered only simply supported rectangular plates under a compressive uniform load acting in the middle plane. The dynamical instability was also analyzed. The equations of motion were obtained …
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Análise dinâmica de placas pelo método dos elementos finitos
The main purpose of the present work is to study the dynamic behavior of plates under specified time-varying loads and moving forces. Initially a brief exposition of the variational formulation concerning the dynamics of thin plates is presented and the finite element method is applied to this …
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Análise dinâmica de torres e estruturas elevadas lateralmente carregadas
The dynamic response of tall building is studied for two different behaviors of structures: a cantilever beam and a shear building. The wind action is supposed to be deterministic. A viscous type damping is introduced and the general equations of the motion are obtained from the Hamilton Principle. …
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Estudo de algoritmos de integração direta para análise dinâmica estrutural
The aim of this work is to compare the direct integration methods (linear and higher order methods) used for the numerical solution of the Structural Dynamic Equations. The structural systems analyzed were assumed to be linear and were modelled by the Finite Element Technique. Besides an example of …
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Análise dinâmica linear de cascas axissimétricas com um elemento finito curvo
Linear dynamic analysis based on the theories of LOVE and FLÜGGE is presented for axisymmetric thin shells under the action of arbitrary loads including temperature effects. The general equilibrium equations and the corresponding boundary conditions are obtained from the Principle of Virtual work. …
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Análise dinâmica não linear da interação solo-estrutura em plataformas marítimas
This work deals with the dynamic nonlinear analysis of soil-structure interaction in offshore platforms, during its installation and operation. Hence, it was developed a numerical model to allow the representation of the soil fundamental plastic and rheological properties. This model also enhances …
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Análise dinâmica e cálculo da fadiga de estruturas de plataformas marítimas
The main purpose of this work is to study the dynamic behaviour and the change in the fatigue damage corresponding to fixed offshore steel structures when there are changes in analysis parameters. The dynamic behaviour for structures similar to those of real offshore platforms is determined using …
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Sistema portátil de aquisição de dados para análise dinâmica de estruturas mecânicas
… um sistema microcontrolado para aquisição dinâmica de sinais. O sistema possui condicionadores analógicos para três canais de entrada, possibilitando a leitura de sinais diferenciais provenientes de transdutores ligados em ponte de Wheatstone. Estes condicionadores provêem tensão de …
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Análise dinâmica comparativa de linhas de ancoragem nos domínios do tempo e frequência
This work deals with the dynamic behaviour of mooring lines at deep water on open sea. Initially are shown two dynamic response calculations approaches, based on the problem solution in the time domain and frequency domain, and procedures for fatigue damage determination. Parametric studies were …
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Um esquema eficiente para a análise dinâmica transiente com o método dos elementos de contorno
This work concerns the optimization of the time marching scheme commonly used to obtain numerical Boundary Element Method solutions for two-dimensional transient problems governed by the Scalar Wave Equation. Two truncating schemes are proposed, named Intermediate and Mixed, which permit control …
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Um estudo sobre métodos de integração direta para a análise dinâmica não-linear de estruturas
ln this work we study numerical aspects of direct integration algorithms for non-linear dynamic analysis by the Finite Element Method. Included here are the Newmark Method, the Central Difference Method and also the treatment of the non-linear terms as pseudo-forces. Some criteria based on energy …
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Análise dinâmica linear por superposição modal de cascas finas arbitrárias pelo Método dos Elementos Finitos
The main purpose of this work is to study the linear dynamic behavior of arbitrary thin shells by the Finite Element Method. Plane triangular elements with eighteen degrees of freedom each are used. The general equations of movement are obtained from the Hamilton Principle and solved by the Modal …
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Análise dinâmica de vigas de pontes pelo método dos elementos finitos - aplicação a vigas Gerber
The dynamic analysis of bridges is presented, being the bridge idealized as an elastic beam under the action of moving constant forces. Special emphasis is given to the dynamic behavior of cantilever bridges. The structure is discretized in finite elements and the analysis is conducted by means of …
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Análise dinâmica de solos submetidos à ação simultânea das três componentes da excitação na base rochosa
Durante a análise sísmica de estruturas complexas, o modelo matemático empregado deveria incluir não só as distribuicões irregulares de massas e de rigidezes senão também à natureza tridimensional da ecitação sísmica. Na prática, o elevado número de graus de liberdade involucrado limita este tipo …
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Análise dinâmica de rotores de grupos turbo e hidrogeradores com o método das matrizes de transferência
… o presente trabalho visa dar subsídiosà análise dinâmicadas linhas de eixos de turbo e hidrogeradores (conjuntos formados pela turbina mais o gerador, usados respectivamentenas centraistermelétricase hidrelétricas). Inicialmente é feita uma breve explanação sobre formas construtivas de …
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Análise dinâmica elasto-plástica de transiente de curta duração incluindo os efeitos da interação solo-fluido-estrutura
The finite element method is employed in the prediction of the dynamic transient response of structures systems exhibiting material non-linearity. The central difference explicit time marching schem is adopted for integration of the dynamic equilibrium equation and a diagonal lumped mass matrix is …
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