Abstract
The vibroacoustic response and sound absorption performance of a structure composed of multilayer plates and one rigid back wall are theoretically analyzed. In this structure, all plates are two-dimensional, microperforated, and periodically rib-stiffened. To investigate such a structural system, semianalytical models of one-layer and multilayer plate structures considering the vibration effects are first developed. Then approaches of the space harmonic method and Fourier transforms are applied to a one-layer plate, and finally the cascade connection method is utilized for a multilayer plate structure. Based on fundamental acoustic formulas, the vibroacoustic responses of microperforated stiffened plates are expressed as functions of a series of harmonic amplitudes of plate displacement, which are then solved by employing the numerical truncation method. Applying the inverse Fourier transform, wave propagation, and linear addition properties, the equations of the sound pressures and absorption coefficients for the one-layer and multilayer stiffened plates in physical space are finally derived. Using numerical examples, the effects of the most important physical parameters—for example, the perforation ratio of the plate, sound incident angles, and periodical rib spacing—on sound absorption performance are examined. Numerical results indicate that the sound absorption performance of the studied structure is effectively enhanced by the flexural vibration of the plate in water. Finally, the proposed approaches are validated by comparing the results of stiffened plates of the present work with solutions from previous studies.
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This work was supported by the National Natural Science Foundation of China (Grants 51405276, 51505261, and 50875030), the Natural Science Foundation of Shandong Province, China (Grants ZR2014EEQ019 and ZR2014EEP025), and the Foundation for Young Teacher Development of the Shandong University of Technology.
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Zhou, H., Wang, X., Wu, H. et al. The vibroacoustic response and sound absorption performance of multilayer, microperforated rib-stiffened plates. Acta Mech. Sin. 33, 926–941 (2017). https://doi.org/10.1007/s10409-017-0659-6
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DOI: https://doi.org/10.1007/s10409-017-0659-6