复杂封闭空间有源消声系统的建模新方法  

New Modeling Method for Active Noise Control within an Irregular Enclosure

作　　者：饶柱石[1] 罗超[1] 耿厚才[1,2] 韩祖舜[1] 

机构地区：[1]上海交通大学振动、冲击、噪声国家重点实验室,上海200030 [2]江南造船集团博士后工作站,上海200011

出　　处：《振动工程学报》2003年第4期415-419,共5页Journal of Vibration Engineering

摘　　要：针对具有两个弹性板的复杂封闭空间的有源消声系统 ,提出了一种新的建模方法。计算机仿真与实验结果验证了这一方法的正确性。该方法拓宽了利用结构声辐射进行有源消声的范围 。A new modeling method is developed for active minimization of noise within a thr ee dimensional irregular enclosure using distributed piezoelectric actuators. I t may be used to provide a practical way for noise control engineering. The irre gular enclosure is modeled with four rigid walls and two flexible panels, and se veral pairs of PZT actuators are bonded to one of the flexible panels. The proce s s of the new modeling method for the irregular enclosure is as follows. Firstly modal coupling method is used to establish the governing equations of motion fo r an acoustic structural piezoelectric coupling system. Then the acoustic modes an d the modal masses of the irregular enclosure are calculated by numerical method . At last the modal coupling coefficients in the governing motion equations are calculated according to the numerical results of the acoustic modes of the irreg ular enclosure and the theoretical functions of panel modes. The validity of the se calculations is verified by a regular hexahedron enclosure. Two cost function s related respectively to global and local control of sound pressure are app lied to this model. With the two cost functions, good results are obtained in mi nimizing noise level within the irregular enclosure according to numerical inves tigations. Experiments are conducted in order to validate the theoretical result s and the modeling method. It is found that in local scheme the experimental results are close to that obtained from simulations.

关 键 词：弹性板 封闭空间 有源消声系统 建模 耦合系数 模态耦合 噪声控制 

分 类 号：TB535[理学—物理]