弹性结构封闭空间有源消声理论研究

A Theoretical Study on Active Noise Control within Enclosed Space Surrounded by Flexible Structure

本文从理论上研究了外力激励弹性结构条件下封闭空间有源消声问题。首先根据声弹性理论,提出分步代入法求解初、次级声场,然后以封闭矩形和圆柱空间为例,研究了不同介质条件下有源消声规律。结果表明:对于弹性结构封闭空间有源消声,当结构-声腔耦合较弱时,次级声源基本上只能抵消声腔模态;当结构-声腔耦合较强时,次级声源不仅能抵消声腔模态,而且对抵消与声腔模态耦合良好的结构模态辐射声也有作用。

In this paper,a theoretical study on active control of within enclosed space surrounded by flexiblestructure is accomplished.The results show that for the case of weak structural-cavity coupling only thecavity-dominate modes can be controlled effectively,both the cavity-dominated modes and a part of thestructrure-dominate modes can he controlled if the structural-cavity coupling turns strong.