Identification method of accelerometer nonlinear error model coefficients with vibration rectification

In order to study the methods of calibrating the accelerometer error model coefficients accurately under linear vibration and high g composite environment, the characteristics of the dual-axis centrifuge are described at first. A dual-axis fixture was designed and fixed on the counter-rotating platform. And the input specific forces of the three axes of the accelerometer were calculated accurately. Then, the static test was performed, in which the spindle axis rotates to equal-spaced angular position and the axis of the counter-rotating platform rotates reversely to corresponding equal position. The average value of the static test was compensated with vibration rectification method. The dynamic test was performed, in which the spindle axis rotates with constant angular rate and the counter-rotating platform axis rotates in the opposite direction with the same angular rate; then the accelerometer error model coefficients were identified accurately. The test simulation results show that the influence of the centrifuge error on calibration accuracy is suppressed greatly using this test method; and the influence of static and dynamic misalignment angles of the counter-rotating platform on the calibration accuracy is quite large and can not be ignored. The measurement accuracy of the centrifuge static and dynamic misalignment angles should be improved and compensated.