利用输入力有源控制水下弹性板辐射声场的分析

Analysis of Active Control of Radiation Sound Field from Submerged Elastic Plate by Input Forces

本文把利用输入力有源控制弹性板辐射声场的方法推广到水下情况.模型为两边简支弹性板上接受到一列平面波产生再辐射,利用输入力进行控制,并用二次型优化计算最佳控制力向量,使目标函数或辐射声功率最小.结果表明利用两个或三个控制力就能获得低频范围内辐射声级的全空间衰减,并且,控制方案的有效性与板的模态响应和辐射场之间的耦合特性有关.

In the paper, the method of active control of radiation sound field from elastic plate by input force is extended to underwater case.The model consist of a plane acoustic wave incident on a baffled simply-supported thin submerged plate.Attenuation is achieved by input forces, and quadratic optimization is used to calculate the optimal control gains necessary to minimizae a cost-function or radiated acoustic power.The results show that global attenuation of broadband radiated sound levels for low-frequencies can be achieved with two or three control forces.The efficiency of the control strategy is demenstrated to be related to the nature of the coupling between the plate modes of response and the radiated field.