【摘要】 以单片压电陶瓷(如锆钛酸铅,简称PZT)晶体、粘贴式和埋入式压电传感器为研究对象,从压电本构方程和结构动力学的振动原理出发,采用集总质量法推导出PZT传感器正压电效应的电荷表达式及等效刚度表达式,建立粘贴式和埋入式PZT传感器的简化力学模型,得到考虑多参数影响的电荷表达式.考虑黏结胶层阻尼吸收能量的作用,建立了胶层阻尼效应影响的传感模型,并求得压电传感器的电压表达式.数值模拟结果表明:在PZT传感模型中,利用压电方程和振动方程联合求解可以快速得到PZT的传感信号,而且PZT片的电压输出特性与作用力的大小及黏结胶层有关.通过测量和分析PZT传感器输出电信号峰值与频率的变化,并与数值分析结果进行对比,证明了运用所建立的传感模型能够有效地模拟检测PZT的正压电规律.更多还原

【Abstract】 Based on single PZT crystals,the surface-bonded and embedded piezoelectric sensors,from the piezoelectric constitutive equations and structural dynamics theory,the equivalent stiffness and the charge expression of PZT sensor based on direct piezoelectric effect are deduced by adopting lumped mass method. The simplified mechanical model for sensor of the surface-bonded and embedded PZT is presented. The charge expressions of multi-parameters influence are derived. The results of numerical simulation and theoretical study showed that the PZT sensor signal can be quickly obtained by joint solving piezoelectric equation and vibration equation. The voltage output of PZT sensor signal is associated with the amplitude of the driving as well as adhesive layer. The amplitude of the output signal is proportional to the peak value of the input driving force. A group of numerical simulation and analysis are carried out to validate the efficiency of the developed model and effectively simulate and detect direct piezoelectric rule of PZT sensor.更多还原