基于压电传感器获取任意边界板结构体积速度

介绍了一种设计体积速度传感器的新方法。设计策略为将PVDF压电薄膜黏结到结构表面上,两维振动结构的表面振速用Legendre多项式展开,利用两维分布式传感器压电方程,设计PVDF薄膜的形状,使传感器的输出电荷量正比于两维结构的体积速度。这样设计得到的传感器,其输出信号的实时性得到了保证,并且适用于任意边界条件,能测量振动结构的局部体积速度,拓宽了其应用范围。此外,还以简支板及其局部区域为例,通过数值计算,验证了设计方法的可行性。

Design of PVDF Film Volume Velocity Sensor

This paper presents a new method to design volume velocity sensor.The design strategy is to affix the PVDF films onto the surface of the structure,using Legendre polynomials to expand the veloci- ty distribution of the structure,and utilize the piezoelectric equations todesign the shapes of the PVDF films keeping the outputs of the sensor to be proportional to the volume velocity of structure.The PYDF sensor designed by this method has good real-time quality,and is valid for any type of boundary condi- tions,so it can measure the local volume velocity of the structure.Besides,for the simple supported plate and part of which,the volume velocity is measured.By numerical calculation,the outputs of the PVDF sensor are compared with the theoretical values,and it demonstrates the feasibility of the method.