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The vibroacoustic response and sound absorption performance of multilayer,microperforated rib-stiffened plates
Authors:Haian Zhou  Xiaoming Wang  Huayong Wu  Jianbing Meng
Institution:1. School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China;2. School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China;3. School of Aeronautics,Shandong Jiaotong University,Ji'nan 250357,China
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 struc-ture, all plates are two-dimensional, microperforated, and periodically rib-stiffened.To investigate such a structural sys-tem,semianalytical models of one-layer and multilayer plate structures considering the vibration effects are first devel-oped.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 lin-ear 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 phys-ical 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 flex-ural vibration of the plate in water. Finally, the proposed approaches are validated by comparing the results of stiff-ened plates of the present work with solutions from previous studies.
Keywords:Sound absorption  Multilayer  Microperfo-rated  Rib-stiffened  Flexural Vibration
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