Determinação da rigidez e amortecimento equivalente proveniente do fluido escoando e interagindo com placas flexiveis : teoria e constatações experimentais

AUTOR(ES)

Gustavo Campos Padovese

DATA DE PUBLICAÇÃO

2001

RESUMO

The understanding and modelling of the stiffness and the damping behavior of structures when subjected to a flow field, is still a very complex problem, dealing with the interaction of two major fields of mechanical sciences. The classical theory of elasticity deals with strains of flexible bodies under predefined external loads. Generally, the external load acting on the body is independent on the deformation of the body itself. However, the situation is different when one considers the fluid flow effects. The aerodynamic loads depend on the relative attitude of the body to the flow. Even the elastic deformation has an important role on the determination of external load. With the recent developments on the Computational Fluid Dynamics (CFD), through FLOTRAN, a commercial fluid flow solver, one can calculate the pressure field around a flexible fiat plate, solving the three-dimensional Navier-Stokes equations. This solver is integrated with a program made using MATLAB, which solves the structural plate equations, using the Finite Element Method. These two programs interact until an equilibrium position is attained and then the equivalent fluid flow coefficients are obtained theoretically, through given small perturbations, around the equilibrium position. An experimental test rig was built, in order to simulate the flexible fiat plate, obtaining its frequency response function. Tests are conducted, firstly with no fluid flow around the plate, and secondly, with the influence of a fluid flow, coupling the test rig with a wind tunnel. With this work, a better understanding concerning the stiffness and the damping behavior of structures is obtained when subjected to a flow field. After getting a better understanding of numerical issues involved in the fluid-structure dynamical interactions, while using a simple plate, the fluid model can be coupled to a more sophisticated structural model

ASSUNTO(S)

placas e cascas elasticas aeroelasticidade dinamica dos fluidos

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