Calibration method of accelerometer on precision centrifuge and its error analysis

In order to increase the calibration accuracy of the nonlinearity error coefficients of the accelerometer mounted on precision centrifuge, the error sources of the centrifuge should be accurately analyzed and effectively separated. Firstly, the corresponding coordinate systems are established by analyzing the error sources of the double-axis centrifuge. The accurate specific force input of the accelerometer on the tested centrifuge is derived by homogeneous transformation method, and the calibration error model of accelerometer is established. Then, the influence of corresponding error sources on calibrating the bias, scale factor and nonlinear error coefficients are analyzed, and the calibration method and the error separation technology are designed. Finally, the error model coefficients of the accelerometer are identified by experiments. The experiment results show that the misalignment error and the deflection of accelerometer effective center of mass are separated accurately. The proposed method can accurately separate out the misalignment error and eccentricity error, and the magnitude of identification uncertainty of nonlinear coefficients is 10-4, which can effectively improve the calibration accuracy of the accelerometer. © 2019, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.