基于解析法的复杂封闭空间有源结构声控制

给出了任意凸多面体声腔在内部点源和外力激励下,腔内声压分布的解析解。该解析方法较传统的数值方法,不仅数据准备量小、速度快精度高,且能够解决目前常用的声弹性法难以解决的复杂几何形状的封闭空腔的声固耦合问题。在此基础上,结合有源结构声控制方法,建立了复杂封闭空间局部区域有源消声的模型,给出了矩阵形式的数值算法,并对一类似车辆驾驶室的复杂封闭空腔进行了有源降噪仿真分析,降噪效果良好,证明该方法可以作为复杂封闭空间有源力消声控制系统的建模基础。

ACTIVE STRUCTURE ACOUSTIC CONTROL WITHIN IRREGULAR ENCLOSURE BASED ON ANALYTICAL METHOD

A new analytical method for acoustic-structure coupled problem within an irregular enclosure, which has both inner sound source and exterior force exciting, is developed based on a method called covering domain method. The method is not only more accurate and faster than numerical method, such as FEM/BEM, but also can be used to solve acoustic-structure coupled problems within any irregular enclosure in a convenient way, which is impossible for the traditional analytical method. The model for active structure acoustic control (ASAC) system of an irregular enclosure based on the method above is founded, and then the optimized actuators outputs are given, which is the key step for ASAC system design. Then the method is applied to a car-like-cavity and it is found that the simulation result is quite good and shows us this new general analytical method for solving active structure acoustic control problem within an irregular enclosure considering acoustic-structure coupling is quite effective and fit for any irregular enclosure.