振动模态与声模态的耦合特性分析

Analysis of Coupling Characteristics between Vibrational and Acoustical Modes

本文考察具有弹性壁面的矩形封闭空间中壁板振动模态与空间声模态的耦合特性。采用有限带宽声功率流法研究了壁板的声辐射功率中声-振耦合所作的贡献,给出了内模态耦合系数的计算公式和模态耦合因子的计算公式。研究表明:壁板结构的辐射声功率不仅与外场声场声压、壁板本身的固有特性有关,而且与壁板和内声空间的耦合特性密切相关。

This paper investigates the coupling characteristics between vibrational and acoustical modes in a rectangular enclosure which has one elastic boundary surface, and studies the contribution of acoustical-vibra-tional coupling to acoustic power radiated by the panel utilizing the band-limited power flow method. The calculating formulas of the joint intermodal coefficient and the modal coupling factor are given in this paper. It is shown that the acoustic power radiated by panel structure depends on not only exterior sound field and natural characteristics of panel* but also modal coupling characteristics between acoustic cavity and panel structure.