A theoretically and numerically investigation of active control of sound radiation from piezoelectric plate into water was performed.Qualitative analysis on the location of piezoelectric sen-sots and actuators of a fluid-loaded plate is given based on the theory of structure-sound coupling,the relationship between structural mode ratio, mode product and sound radiation power is deduced.Based on the numerical computation method of finite element method/boundary element method (FEM/BEM),Quantitative analysis of the control result of sound power level is done according to dis-posal scheme of piezoelectric patches. The disposal scheme of piezoelectric patches based on the theory of structure-sound coupling gives a better multi-mode control result compared with the scheme only based on strain theory at low frequency.The proposed model on piezoelectric patches location can be used for designing and predicting the control of structural acoustic radiation of a flu-id-loaded plate.%对水下结构声辐射压电控制的压电片布置问题进行了深入的理论和数值分析.首先基于声振耦合理论,对低频段声辐射板的压电传感器和作动器的布置做了定性的分析,给出了声辐射功率与结构模态比和模态积之间的关系式.其次基于有限元/边界元数值计算方法,对所提出的压电片布置方案进行了辐射声场控制的定量计算.通过计算比较可以看出,基于声振耦合理论的压电片布置方案在低频段所得到的多阶模态控制效果,优于基于振动模态应变贴片理论控制方法所得到的控制效果,可以用来进行流体加载板结构声辐射控制的设计和预测.
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