振动固定板结构体积位移的获取

Acquisition of volume displacement of the clamped-clamped plate

在低频时控制振动板结构的体积位移是降低结构总声功率的一种有效策略。提出一种阵列式压电式传感器的设计方法测量固定板体积位移。通过对PVDF传感器阵列输出信号设计的加权系数,使PVDF传感器阵列输出信号为相应结构体积位移。结果表明这种阵列式PVDF传感器的加权系数与施加在振动板表面的外激励力性质(如激励力类型、位置等)无关。并且分析了影响阵列式PVDF传感器的各种因素及其适应性。

Controlling the volume displacement of a vibrating plate has previously been shown to be a good strategy to reduce its overall sound radiation.With the examples of the clamped-clamped plate,a new piezoelectric sensor design was presented to measure the vibration volume displacement.An array of rectangular segments of PVDF film attached on the surface of the plate was taken as sensor.The output signals of the PVDF films were multiplied by appropriate weights so that the weighted combination of the outputs directly leads to the vibration volume displacement.It is shown that the array sensors design is independent of the external excitation properties such as type,magnitude,position,and etc.and it can be applied to vibrating plates with arbitrary boundary conditions.In addition,the influencing factors and the adaptability of the array sensors were analysed.