高应变载荷下压电传感器性能研究

Study on the Performance of Piezoelectric Sensor Under High Strain Load

压电传感器具有优良性能,可以同时应用于主、被动式结构健康监测技术中,但由于高应变载荷下压电传感器的性能会受到影响,限制了在实际工程中的应用。该文针对高应变载荷下传感器性能进行研究,提出通过增加胶层厚度和减小弹性模量,增强压电传感器的高应变承受能力。定义了阻抗信号变化指数和阻抗信号突变载荷,对压电传感器性能进行表征。实验结果表明,胶层厚度增加,弹性模量减小,会使阻抗信号突变载荷增大,压电传感器高应变承受能力提高。

Piezoelectric sensor can be used in active and passive structural health monitoring for its excellent properties, but the applications in practical engineering is limited for the bad performance under high strain load. The performance of PZT sensor under high strain load is investigated in this paper. A new method is proposed to enhance the affordability of high strain load by increase the adhesive layer thickness or decrease the modulus. A variation index and mutation load of im- pedance signal is defined to characterize the performance of the piezoelectric sensor under high strain load. The experiment results show that the mutation load of impedance signal increases with the increase of the adhesive layer thickness and the decrease of the modulus, thus the affordability of high strain load is enhanced.