Research On Key Technology Based On Stable Loading For The In-situ Calibration System Of The Sensor

The in-situ calibration system of the sensor is a equipment, which can check anddemarcate rocket engine thrust, when calibrate the sensor,controlling the loading rate andloading processs is by experience of operator, low load stability and low degree ofautomation. Especially in the sensor with smaller detection range, the load process isunstable. This paper sees the detection part of thrust in the in-situ calibration systems as theresearch object,. This paper expounds present research situation of calibrating sensor in themethod of superposition, and demonstrates the significance of sensor detection part in thein-situ calibration systems. Rough loading power of the sensor detection part in the in-situcalibration systems is provided by servo motor, and its fine adjustment part takes micropower generator of piezoelectric ceramic to adjust the micro force.This paper also introduces the mechanical structure and working principle of in-situcalibration system, and conducts analysis and research of loading stability of the roughloading part and fine adjustment part of in-situ calibration system. In the process of roughloading, we calculate contact force of the measured sensor when contacting. We also obtainthe speed of servo motor when the measured sensor has not been loaded force, and thespeed is the critical speed of the motor. We conduct the dynamics analysis on this processand use ADAMS software to simulate.In the process of rough loading, to make the detection part of sensor in the in-situcalibration systems can load stably, the set speed of the motor cannot exceed the criticalspeed. Aiming at the alarm of servo motor happening in the process of the experiment, We conduct calculation and analysis about the rough loading part and the stability of screw inthe process of rough loading. We also use software ANSYS to calculate and simulatedeformation of column in the process of rough loading, and analyze the influence of columndeformation to the movement of moving beam. Therefore we find that when loading themeasured sensor the work position of the moving beam should stay away from the positionwhere the column has large deformation in the process of rough loading.In the process of fine-tuning, the converse piezoelectric effect of piezoelectricceramics is used, and micro power generator of piezoelectric ceramic of fine-tuning partgenerates force in the way of piezoelectric stack,so we analyze the relationship between theboth ends voltage of piezoelectric ceramics after the stack and the micro displacementproduced by the whole piezoelectric ceramics, thus we indirectly obtain the relationshipbetween both ends voltage of the piezoelectric ceramic micro force generator and microdisplacement. We apply the conclusion to control program of the fine-tuning part to realizestable loading of fine-tuning part.We use automation control system with PLC and HMI, which makes the operationmore convenient and the interface more intuitive, and apply the control parameter of speedand time on rough loading and fine-tuning part to the control system, which makes thedetection part of sensor in the in-situ calibration systems get stable load.