Study on Dynamic Sensitivity Calibration of Force Sensor Based on Sine Method
In order to calibrate the dynamic sensitivity of preloaded piezoelectric force sensors,its frequency response characteristics and the preloaded structure design are studied.Firstly,the incentive method of sinusoidal force is introduced,the calibration mathematical model is established,and the sensor is tested in the upright and inverted installation mode.The influence of the inertial force introduced by the equivalent end mass on the dynamic sensitivity calibration is studied through the comparative tests.Then,the sensor and the additional mass are installed in the vibration system.The system installation resonant frequency is obtained by white noise excitation.the relationship between the effective frequency range and measure-ment accuracy of the sensor and the installed resonant frequency is studied.Through the theoretical analysis,the reasons for the different equivalent mass at both ends of the sensor and the asymmetric design of the preload structure are studied.Final-ly,the sensitivity uncertainty of the force sensor is evaluated and analyzed.The test results show that when the additional mass is about 120 times of the sensor,the effect of the equivalent end mass on the sensitivity calibration can be ignored;The natural frequency of piezoelectric force sensor is up to 46 kHz,but its effective frequency range is limited by the installation resonant frequency.When the ratio of test frequency and installation resonant frequency f/f0 is less than or equal to 0.1,the accuracy grade of piezoelectric force sensor is 1％;The light end of the sensor should be connected to the measured object during dynamic tests.
sensitivityforce sensorequivalent end masscalibrationdynamic characteristicuncertainty
万方数据
维普
