Bem-Fem Coupling For Acoustic Effects On Aeroelastic Stability Of Structures
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Date
2008-07
Authors
Irtan Safari
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Abstract
A series of work has been carried out to develop the foundation for the
computational scheme for the calculation of the influence of the acoustic disturbance to
the aeroelastic stability of the structure.
The generic approach consists of three parts. The first is the formulation of the
acoustic wave propagation governed by the Helmholtz equation by using boundary
element approach, which then allows the calculation of the acoustic pressure on the
acoustic-structure boundaries. The structural dynamic problem is formulated using
finite element approach. The third part involves the calculation of the unsteady
aerodynamics loading on the structure using generic unsteady aerodynamics
computational method.
Analogous to the treatment of dynamic aeroelastic stability problem of structure,
the effect of acoustic pressure disturbance to the aeroelastic structure is considered to
consist of structural motion independent incident acoustic pressure and structural
motion dependent acoustic pressure, rĀ¢erred to as the acoustic aerodynamic analogy.
In the present development, rigorous consideration has been devoted to the
acoustic scattering problem. The governing equation for the acousto-aeroelastic
problem is then formulated incorporating the total pressure (inCident plus scattering
pressure), and the acoustic aerodynamic analogy. A generic approach to solve the
governing equation as a stability equation is formulated allowing a unified treatment of
the problem.
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Keywords
To develop the foundation for the , aeroelastic stability of the structure