Revisiting the Nonlinear Response of a Plate to Acoustic Loading

Accurate prediction of the structural response of stiffened aircraft skins to acoustic loading is necessary for the design of future Air Force vehicles. Response prediction requires time integration of nonlinear models. Recently, methods have emerged where a nonlinear finite element model is reduced...

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Bibliographic Details
Main Authors: Hollkamp, Joseph J, Gordon, Robert W, Beberniss, Timothy J
Format: Report
Language:English
Subjects:
ACOUSTIC LOADING
ACOUSTIC RESONANCE
ACOUSTIC WAVES
Acoustics
AIR FORCE EQUIPMENT
Aircraft
COMPUTATIONS
EQUATIONS
EXPERIMENTAL DATA
FINITE ELEMENT ANALYSIS
LOADING(ELECTRONICS)
NONLINEAR ALGEBRAIC EQUATIONS
PE62201F
PLATES
PREDICTIONS
RESPONSE
SKIN(STRUCTURAL)
Structural Engineering and Building Technology
STRUCTURAL RESPONSE
SYMPOSIA
WUAFRLA0830G
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Summary:Accurate prediction of the structural response of stiffened aircraft skins to acoustic loading is necessary for the design of future Air Force vehicles. Response prediction requires time integration of nonlinear models. Recently, methods have emerged where a nonlinear finite element model is reduced to a low-order system of nonlinear equations to better enable the computations. Well-characterized experiments are needed to validate these methods. In a previous study, experimental data from a thin rectangular plate subjected to acoustic loading were compared to model predictions. Poor agreement between the model predictions and the experimental data raised questions concerning the coupling between the structure and the acoustics. The experiment is repeated in this study with modifications to eliminate an acoustic resonance and better observe the structural/acoustic interaction. The results confirm that the modeling methods capture the structural mechanics of the problem, but lack the necessary coupling with the acoustic medium. Presented at the AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (49th), AIAA 2008-2233, held in Schaumberg, IL, on 7-10 Apr 2008. Published in the proceedings of the conference, p1-12, 2008.