精密离心机误差对石英加速度计误差标定精度分析

分析了离心机各个误差源,用齐次变换法精确地计算了产生的向心加速度,给出了向心加速度、重力加速度和哥氏加速度在加速度计坐标系下的分量,推导了被试加速度计输入加速度的精确表达式.在给出石英摆式加速度计在精密离心机上标定时的误差模型的基础上,着重讨论了误差模型系数的计算值与离心机误差之间的关系.根据仿真结果找出了某些离心机误差对加速度计误差系数标定的影响关系,为按照加速度计的标定精度来确定离心机的精度打下了理论基础.

Relationship between Calibration Accuracy of Error Model Coefficients of Accelerometer and Errors of Precision Centrifuge

In this paper,error sources of the precision centrifuge are analyzed at first,and a homogeneous transformation method is used to accurately calculate the centripetal acceleration,as well as components of the centripetal acceleration,the acceleration of gravity,and the Coriolis acceleration in the input,the output and the pendulum axes of the tested accelerometer.Then the error model of quartz pendulous accelerometer to be tested on the centrifuge is given,the calculated specific forces acting on three axes of the accelerometer are substituted into the error model,then the relationship between the calibration errors and the errors of the centrifuge is established.Finally,the correspondences between the calibration accuracy of each error model coefficient of accelerometer and some error sources of centrifuge are determined by using simulation results,thus laying a theoretical foundation for the determination of centrifuge accuracy according to the demand for calibration accuracy of accelerometer.