用于加速度计静态标定的精密倾斜平台

Precision tilting platform used for static calibration of accelerometers

提出一种用于加速度计静态标定的精密倾斜平台装置,利用直线电机驱动,将直线电机的线位移转换为台面的角位移。建立了装置的理论模型并介绍了其测控系统,分析了影响定位精度的因素。台面静态误差主要受温度、重力影响;制造和装配误差通过线位移与角位移的转换关系影响系统精度;动态误差主要受轴承跳动影响,导轨运动的误差可以忽略不计。通过实验研究得出影响系统精度的主要原因,并给出了误差补偿的方法。结果显示误差主要来源于电机和转动部件的装配误差,经软件补偿后,在-3 600″^+3 600″,定位误差均小于±2″。

A precision tilting platform used for static calibration of accelerometers was presented. Linear motor was utilized and its linear displacement was converted to the angular displacement of the platform. Simplified mechanical model,as well as measurement and control system for the platform were introduced,and the factors that caused positioning error were analyzed. Static error is caused mainly by temperature variation and the gravity. Manufacturing and assembling error affects the positioning accuracy through theoretical transformation of the linear and angular displacement. Dynamic error is mainly influenced by run out bearing in which parallelism offset of the linear guide rail can be disregarded. Main factors which caused the system error were obtained through experiments,then the compensation method was presented. Results indicate that the dimensional error caused by assembling is the main source of the positioning error. After compensation in software,the absolute error is reduced to less than ± 2. 0″ in the range of- 3 600″ to ＋ 3 600″.