薄壁压电陶瓷圆管机电参数的测定

依据导出的切向极化和径向极化压电陶瓷薄壁圆管无负载电导纳方程,给出由压电陶瓷圆管测量数据,计算出机电参数的方法、公式和步骤。实验测知压电陶瓷薄壁圆管的尺寸、密度、低频电容、最大导纳频率与最小导纳频率以及其它若干频率上的电导纳等,然后用给出的公式计算杨氏模量、泊松比、机电耦合系数、介电常数和压电常数等。运用这一方法,对若干实际圆管样品作出了测量和计算。

MEASUREMENT AND CALCULATION OF THE ELECTROMECHANICAL PARAMETERS OF THE PIEZOCERAMIC THIN CYLINDRICAL TUBE TRANSDUCERS

On the basis of the electrical admittance equation for the unloaded tan-gentially and radially polarized piezoceramic thin circular cylindrical tube,the method and formulars,also the program for calculating the electromechanical parameters from the measured data are presented. If the size,density,capacitance at low frequency,frequences at maximum and minimum admittances,and several other admittances with their corresponding frequencies are known from the measurement,then the Young’s modulus,Pois-son’s ratio,electromechanical coupling coefficients,permitivity,and piezoelectric constants can be calculated with the formulars given here. Practical measurements and calculations for several samples have been carried out with this method.