板声传输主动控制辐射模态控制方法研究

Application of a sound radiation control method to actively control sound transmission through plates

为了使结构的低频强迫传声得到控制,研究了基于声辐射模态的结构声传输主动控制方法.提出了结构振动模态和声辐射模态之间的对应关系式,据此在解耦的独立模态空间建立了声辐射模态控制方程.通过基于H∞控制律的控制仿真计算,验证了使用声辐射模态控制方程进行结构声传输主动控制的有效性.相对于独立模态空间控制方程,声辐射模态控制方程在低频结构传声损失的控制上有明显的优势.

In order to reduce sound transmission loss at low frequencies,a type of active structural acoustic control method was proposed that was based on the independent modal space method.According to the corresponding expressions of the relationship between vibration mode and radiation mode,the sound radiation mode control equation was deduced in a decoupled independent modal space.Numerical simulations of active control of the transmission of sound through plates was developed based on H∞ control,using the finite element method along with the boundary element method（FEM-BEM） as the control equation for sound radiation modes.This method of controlling sound radiation was tested in a simulation and shown to improve control of transmission loss compared with the independent modal space control method（IMSC）.