Computational Scheme Of Aerodynamic-Acoustic-Structure Coupling For Acoustic Effects On Aeroelastic Structures
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Date
2011-07
Authors
Yu, Kok Hwa
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Abstract
This thesis presents a development of a computational scheme involving aerodynamicacoustic-
structure coupling in studying the acoustic effects on aeroelastic structure. For
this particular problem, it involved multi-disciplinary interaction between aerodynamics,
acoustics and structural dynamics in solving the acousto-aeroelastic problem. The first
step is to model the wing structural using Finite Element Method (FEM) and tested for
the free vibration analysis. In the aerodynamic part, a comprehensive consideration is
devoted on aerodynamic basis in developing the aerodynamic model forĀ· unsteady
subsonic flow using two- and three-dimensional unsteady panel method. For validation,
the present method is compared with commercial software like FLUENT and other
researchers' work using predominant techniques such as the Doublet Lattice Method
(DLM) formulation obtained from Blair (1992). Using the pressure distribution
generated by unsteady panel method, the unsteady pressure coefficient is then converted
into frequency domain before assembled in the aeroelastic equation. The solution for
aeroelastic problem is eventually obtained using k-method. In the last part, the acoustic
modeling is carried out using Boundary Element Method (BEM). Utilizing the BEM
formulation, the acoustic pressures are obtainect on the structure surface. Subsequently,
combining the aerodynamic and acoustic loadings, the developed acousto-aeroelastic
equation is formed and the outcomes are demonstrated on typical wing structures. Two
standard wing models were used in this study and they are rectangular and AGARD
445.6 wing models. Using the described computational approach, MATLAB software is
utilized in order to model and analyze the problem for this entire research. Thus, this
study is centered on computational results and no experimental outcomes will be
involved.
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Multi-disciplinary interaction between aerodynamics, acoustics and structural dynamics , in solving the acousto-aeroelastic problem.