Vibro-acoustic analysis of laminated composite plate structure using structure-dependent radiation modes: An experimental validation

Abstract

In this article, the acoustic radiation responses of the layered composite flat panel in an infinite rigid baffle under the influence of harmonic point load and various support conditions were investigated numerically. The laminated composite flat panel responses were computed using the ANSYS parametric design language code. The natural frequencies obtained using the current simulation model matched the earlier published values as well as in-house experimental results. The eigenvectors corresponding to the validated eigenvalues were extracted and utilised for the computation of the acoustic properties numerically by solving through Rayleigh integral scheme. The first radiation mode's amplitudes for the vibrating plate were computed and validated with the results available in open literature. Further, the self-radiation efficiency and radiated sound power were obtained based on the structure-dependent radiation modes, and all the radiation modes were also included to evaluate the exact radiated sound power. Finally, the effects of different composite (carbon/epoxy and glass/epoxy) properties, constraint conditions, and location of point load on the displacement and velocity responses, radiation efficiency, and radiated acoustic power level of the layered flat panel were investigated and discussed in detail.