Design and Optimization of a Triangular Shear Piezoelectric Acceleration Sensor for Microseismic Monitoring

Abstract

Aiming at the characteristics of low sensitivity and narrow frequency range of existing microseismic monitoring sensors for mine water hazard prevention and control, a piezoelectric acceleration sensor for microseismic monitoring based on a kind of triangular shear structure is proposed. Firstly, the structure of the triangular shear piezoelectric acceleration sensor is designed, and its dynamic model is built. The structural and material parameters related to natural frequency and sensitivity are analyzed. Then, the selection of piezoelectric ceramic materials is discussed. The parametric design of the designed sensor is carried out, and its finite element structural model is built by ANSYS. The modal analysis, resonance response analysis, and piezoelectric analysis of the designed sensor are carried out. The simulation results indicate that the working frequency and sensitivity of the designed sensor meet the requirements of microseismic monitoring. Response surface optimization is adopted to analyze the influence of sensor element design variables on the sensitivity and resonant frequency of the designed sensor. The reoptimized design of the reference sensor improves the resonant frequency of the designed sensor by 9.46% and the charge sensitivity by 18.96%. Finally, the designed sensor is calibrated, and the microseismic signal detection experiment is carried out. The results indicate that the resonant frequency of the designed sensor is 6150 Hz, the working frequency is 0.1-2050 Hz, and the charge sensitivity is 1600 pC/g. The sensor can detect microseismic signals with a wide frequency range and high sensitivity.

Accuracy Assessment of Charge-Mode Accelerometers Using Multivariate Regression of the Upper Bound of the Dynamic Error

“…Assessment of the accuracy of charge-mode accelerometers is extremely important in areas such as mechanical science [1], navigation [2], medicine [3] and geotechnics [4], particularly because they can be used over a wide temperature range [5]. In everyday engineering practice, the accuracy of this type of accelerometer is assessed by way of calibration, by comparing its charge sensitivity with the corresponding reference values [6,7].…”

Research Status and Development Trend of Piezoelectric Accelerometer

“…Through the action of the mass block, the piezoelectric element will be deformed due to the inertial force in the opposite direction of the acceleration of the device to be measured. Due to the piezoelectric effect, the two surfaces of the piezoelectric element will accumulate equal amounts of opposite charges, thus producing a potential difference [12]. When the measured vibration frequency is much lower than the intrinsic frequency of the accelerometer, the change in force is proportional to the measured acceleration.…”