四随动式线加速度计动态校准装置的研制

Development of Dynamic Calibrating Device with Four Turntables for Linear Accelerometer

摘要:

常规振动台因输出幅值有限无法满足线加速度计高g值下的动态校准,针对该问题研制出带四随动平台的离心机。在分析了其工作原理基础上,从结构及电控两方面介绍了装置研制过程。结构方面首先介绍了装置轴系设计,其次以模拟计算出的轴系惯量值及要求转速值为设计输入进行了电机选型计算,并介绍了测角码盘的配置情况。电控方面,以稳速台为例,采用“空间矢量脉宽调制+id=0控制”方法建立系统模型,并给出调速模式仿真结果。以随动台为例,位置环设计采用复合控制方法,利用动态误差系数法由“双十指标”推算出前馈控制器参数可行域。最后通过实验对装置速率精度及平稳性指标、跟随正弦指令的幅值误差及相移指标进行了精度测试,结果表明校准装置满足项目指标要求,系统达到预期控制效果。

Abstract:

The conventional shaking table can not meet the dynamic calibration of linear accelerometer at high g value because of its limited output amplitude. To solve the problem, a centrifuge with four servo platforms is developed. Based on the analysis of its working principle, the development process of the device is introduced from the aspects of structure and electronic control. In the aspect of structure, the design of shafting system is introduced firstly. Secondly, the motor type selection calculation is carried out based on the inertia value and requiring speed value of shafting calculated by simulation, and the configuration of angle measuring codes is introduced. In the aspect of control system, taking the steady speed table as an example, the control system model is established by the method of "space vector pulse width modulation + id=0 control", and the simulation results of speed regulation mode are given. Taking the servo turntable as an example, the compound control method is adopted in the design of the position loop, and the feasible region of the parameters of the feedforward controller is deduced from the "double ten indexes" by using the dynamic error coefficient method. Finally, the accuracy of the device"s speed accuracy and stationarity index, the amplitude error following the sinusoidal command and the phase shift index are tested by experiments, and the results show that the calibration device meets the project"s requirements and the system achieves the expected control effect.