Analysis and Design of Piezoelectric Shock Sensor Piezoelectric Variable Coefficient Multi-degree-of-freedom Force-electric Coupling Dynamics

doi:10.3901/JME.2025.04.001

Abstract

Abstract: The piezoelectric impact acceleration sensor is the key device for impact measurement. The precision of modeling is closely related to shape and piezoelectric coefficient. The variation of piezoelectric coefficient caused by the change of sensitive structure mass, stiffness distribution and material size are considered. By using the method of multi-segment division of irregular structure and dynamic correction of variable coefficient, the modified model of piezoelectric impact sensor with variable coefficient is established. The time domain voltage response of the sensor with the mechanical derived internal electric field is obtained. The experimental results, which are consistant with the modified model, show that the relative error of the piezoelectric output amplitude is 9.75%. Compared with the traditional model with constant coefficient, the accuracy of the modified model is improved by 36.29%, and the time-domain response accuracy of the modified model is higher. In addition, in the calculation process of the equivalent model, the output voltage will increase with the increase of leakage resistance, showing a linear positive correlation. Therefore, in order to avoid the influence of leakage resistance on voltage sensitivity, the charge sensitivity of the sensor is calculated to be 10.6 pC/g by using the charge response, which further demonstrates the accuracy of the modified model.

Key words: piezoelectric sensor, force-electric coupling, parameterization, impact response, equivalent mode

CLC Number:

TP212

ZHOU Huachen, ZHAO Jian, LI Haiyang, WEI Ruiyue, LIU Pengbo, HUANG Yu. Analysis and Design of Piezoelectric Shock Sensor Piezoelectric Variable Coefficient Multi-degree-of-freedom Force-electric Coupling Dynamics[J]. Journal of Mechanical Engineering, 2025, 61(4): 1-10.

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