| Accelerometer have a wide range of applications in robot motion control,fault diagnosis and prediction,seismic wave detection,and other fields,and their dynamic performance constrains the application range of the sensors.Existing research techniques for the dynamic characteristics of accelerometer have been commercialized,but calibration equipment is complicated and expensive,and is not suitable for the study of dynamic characteristics of multi-dimensional accelerometer.It is one of the key technologies of multi-dimensional accelerometer to carry out research on dynamic characteristics test technology for multi-dimensional accelerometer.In order to further improve the dynamic characteristics of the accelerometer,based on a method that can simultaneously identify the order and parameters of the linear difference equation model,this paper aims at the shortcomings of the impact excitation method for dynamic calibration of the sensor.Methods The dynamic mathematical model of the sensor is established and its dynamic characteristics are analyzed.In order to improve the dynamic characteristics of the sensor by optimizing the structural parameters of the sensor,an efficient post-dynamic compensation algorithm is used to improve the dynamic characteristics of the accelerometer.The main contents of this article are as follows:(1)The dynamic characteristics of the accelerometer are analyzed from the theoretical analysis method.Firstly,the description method of the sensor's dynamic characteristics and the calculation method of the dynamic performance index are introduced;then based on ANSYS finite element analysis software,the transient dynamics simulation of the accelerometer is completed and its dynamic characteristics are analyzed.(2)Experimented the dynamic calibration method of the accelerometer.Based on the relevant theoretical knowledge of test dynamics,vibration and shock,the mechanical model of the sensor installation system was established;then the main deficiencies of the current shock excitation experiment were analyzed and studied;finally,the dynamic calibration of the sensor was completed and given Its dynamic performance index.(3)Establish a dynamic mathematical model of the accelerometer.Based on a modeling method that can simultaneously identify the order and parameters of the difference equation model,a mathematical model that can describe the dynamic characteristics of the accelerometer is established using the sensor dynamic calibration experimental data;then the established dynamic mathematical model is verified.(4)Research on the compensation method of amplitude-frequency characteristic.On the premise of not changing the mechanical structure of the sensor,based on a simple and efficient compensation method,the dynamic compensation function is calculated according to the amplitude-frequency characteristics of the sensor;then the simulation analysis and experimental verification of the sensor dynamic compensator are completed.In this paper,related work is carried out for the analysis and improvement of the dynamic characteristics of the piezoelectric accelerometer.The conclusion of the study has certain guiding significance for the dynamic calibration and improved dynamic characteristics of the piezoelectric accelerometer system. |
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