Revised error calibration model of linear accelerometer on precision centrifuge

Abstract

The common error calibration model of a linear accelerometer usually cannot meet the accuracy requirement without considering the influence of misalignments in the precision centrifuge test. In order to improve the calibration accuracy, a series of coordinate systems is established and precise accelerations along the input axes of the accelerometers are deduced first. Then, by analyzing the mechanisms of the main error sources, the revised error calibration model is established which includes the misalignments, the radius errors, and the nonlinearity error terms. Then, the measurement methods are proposed to estimate the initial angular misalignments, the installation angular misalignments, and the installation radius misalignments by a theodolite and the accelerometer themselves in the different modes of the centrifuge, respectively. Finally, the experimental measurement results show that the initial angular misalignments are estimated accurately and less than 0.5′ after adjustment. Further investigation shows that the adequacy of the common error calibration model decline obviously and the calibration accuracies are lower than 6 × 10−3g/g without considering the misalignments. After compensating for the misalignments in the revised model, the error coefficients are identified precisely, and the calibration accuracies are higher than 1.5 × 10−3g/g.

Intelligent Clothing Design and Data Acquisition under the Scientific Graphics Programming Combined with Wearable Multisensor

“…e errors of the accelerometer in the measurement process include random error, proportional error, nonorthogonal error, and fixed deviation [15]. In the ideal case, the three axes of the accelerometer are completely orthogonal and do not interfere with each other.…”

Research on calibration of accelerometer combined Norm-observation method based on global optimization

“…Because the traditional calibration method basically uses the rotating platfrom for calibration, however, any precision equipment has errors such as angular position error and non perpendicularity between rotating axis so on. Calibration in the gravity field does not meet the navigation conditions for highspeed flight [1][2][3][4][5][6][7][8][9] . In order to overcome the limitation of over reliance on rotating platform, Dutch scholar Lӧtters proposed a calibration method using Norm-observation method [10] .…”

Cross-Coupling Coefficient Estimation of a Nano-gAccelerometer by Continuous Rotation Modulation on a Tilted Rate Table

“…For accelerometers with a full-scale input range of about 1 g or a resolution no less than ~1 μg, the local gravity field test such as multipoint methods are conventionally available for determining the accelerometers' linear, nonlinearity, and cross-coupling coefficients based on a dividing head [14][15][16][17] . For accelerometers with a full-scale input larger than 1 g, a precision centrifuge is often employed to precisely produce acceleration with the required magnitude [18][19][20][21] . Dynamic tests are generally carried out on an electromagnetic vibrator [22][23][24] .…”