通过压电式传感器进行简支梁声辐射有源控制

Active control of sound radiation from simply supported beam using piezoelectric sensors

以简支梁为例，通过声辐射模态研究简支梁声辐射的有源控制。由于在中、低频时，声辐射模态对应的辐射效率随着模态阶数的增加而迅速降低。本文提出了一种新的控制策略，即通过设计特定形状的ＰＶＤＦ作为传感器来测量前Ｌ阶声辐射模态的伴随系数，使前Ｌ阶声辐射模态的声功率最小化。最后通过数值计算研究了控制力和传感器数目对控制效果的影响。

With an example of simply supported beam, it is presented to active control structure-borne sound by mean of radiation modes. The radiation efficiency of the radiation modes falls off very rapidly with the increase of modes order at low frequency. A new control strategy is developed in which the adjoint coefficient of the first L radiation modes measured by using shaped PVDF sensor, then the sound powers of the first L radiation modes are minimized. Finally,by numerical calculation the control effects of number of control forces and sensors are investigated.