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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, we study the problem of active noise reduction in closed space under the external excitation elastic structure theoretically. Firstly, according to the theory of acoustic elasticity, a step-by-step approach is proposed to solve the initial and secondary sound fields. Then, the closed-loop and cylindrical spaces are taken as an example to study the law of active noise cancellation under different media conditions. The results show that when the structure-sound cavity coupling is weak, the secondary sound source can only basically cancel the cavity mode. When the structure-sound cavity coupling is strong, the secondary sound source can not only Counteract the acoustic cavity mode, and also have an effect on canceling the structural modal radiation sound which is well coupled with the acoustic cavity mode.