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研究了利用分布式点力源作为次级力源对封闭空腔内的结构辐射噪声进行控制的问题,并对封闭空腔中结构辐射噪声的控制机制进行了分析.建立了包含2块简支弹性板的矩形封闭空腔,并将其作为研究对象.通过对初、次级声场以及结构-声耦合的特性分析,以减小腔内声场的声压级为最优控制目标,分析比较了在不同位置及参数的次级点力激励下腔内声场的声压级响应.仿真结果表明,在2块弹性板上施加联合激振力控制腔内噪声的效果要明显好于激振力只作用在受激弹性板上.
The problem of using the distributed point force as the secondary force source to control the structural radiation noise in a closed cavity is studied, and the control mechanism of the structure radiation noise in a closed cavity is analyzed. The rectangular closed cavity of the elastic plate is taken as the research object.According to the analysis of the primary and secondary sound field and the structure-acoustic coupling, the objective is to reduce the sound pressure level of the cavity sound field as the optimal control target, The sound pressure level response of the cavity under the excitation of the secondary force at different positions and parameters is simulated.The simulation results show that the effect of controlling the cavity noise by applying the combined excitation force on the two elastic plates is obviously better than the excitation force only Effect on the elastic plate.