Abstract
Dynamic behavior of a nonlinear composite beam under the action of acoustic incident waves is analyzed in this paper. Frequency responses are obtained in primary resonance condition. The coupled vibroacoustic system is solved by the multiple scale method combined with the Green’s function approach. Two types of geometrical nonlinearities including cubic and quadratic terms are focused. Semi-analytical solutions are obtained in integral forms. Within a parametric study, effects of the ply orientation and material damping on the frequency responses and scattered potential are investigated. It is found that unsymmetric layout induces negative quadric characteristic behavior and applies extra skewness to the frequency responses. It is also proved that the nonlinear composite beam can further dissipate the sound energy with respect to a linear system particularly when it is tuned for an optimal damping.
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