精密离心机主轴回转误差对加速度计输入精度的影响

Influence of rotary errors of centrifuge spindle on accelerometer input accuracy

介绍了用4个位移传感器法测试精密离心机主轴径向回转误差和倾角回转误差的方法,计算了主轴回转误差中一次谐波,它包括圆锥运动和一次谐振运动,对一次谐波如何影响精密离心机中的向心加速度及其在加速度计坐标系下的分配作了详细分析,同时对重力加速度分配的影响也作了详细的分析。最后得出了被测加速度计的输入加速度的平均值的补偿方法,进一步提高了加速度计的输入精度。通过对离心机主轴回转误差运动的检测和测试,定量分析了对加速度计输入精度的影响,有助于提高加速度计的标定精度。

A measurement method was introduced which used 4 displacement sensors to measure rotary errors of the spindle in precision centrifuge. The first harmonic errors were calculated which include the coning movement and the first harmonic movement. The influences of these errors on the centripetal acceleration, its distribution and the distribution of gravitational acceleration on the three axes of tested accelerometer were expounded. The method that compensated the average input acceleration of the calibrated accelerometer was put forward, so the calibration accuracy of the accelerometer can be enhanced further. Through monitoring and measuring the rotary error movement of centrifuge spindle, and its influence on acceleration input accuracy of tested accelerometer was quantitatively analyzed which is helpful for raising the calibration accuracy of the tested accelerometer.