| 摘要: |
| 为了提高摆式积分陀螺加速度计在精密离心机上的标定精度，针对单轴式精密离心机主轴回转过程中动不平衡引入的一次谐波运动对加速度计标定的误差机理进行了研究。首先，分析了主轴一次谐波误差的来源，在此基础上，通过建立坐标系并进行误差传递，推导了包含一次谐波误差的加速度计输入输出方程。然后，对该方程进行分析，揭示了一次谐波误差引入加速度计虚假二次项误差的机理。最后，利用高精度测微仪监测了离心机的一次谐波运动，以补偿虚假二次项误差，使动不平衡误差对二次项系数标定误差的影响程度从10-6 rad/（s·g2）降到10-8 rad/（s·g2）量级。 |
| 关键词: 精密离心机 动平衡 摆式积分陀螺加速度计 二次项系数 标定 |
| DOI： |
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| 基金项目: |
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| The mechanism of PIGA's pseudo-second-order term generated by spindle dynamic imbalance of centrifuge |
| LIU Yikang,ZHANG Chunjing,HE Dong,YU Zhiwei,REN Shunqing |
| (Space Control and Inertial Technology Research Center，Harbin Institute of Technology, Harbin 150080, China;Beijing Institute of Aerospace Control Devices, Beijing 100854, China) |
| Abstract: |
| In order to improve the calibration accuracy of the pendulous integrating gyroscopic accelerometer on the precision centrifuge, the mechanism of the effect of the first harmonic motion induced by the dynamic imbalance during the rotation of the single-axis precision centrifuge spindle on the calibration accuracy of the accelerometer is studied. First, the principle of the first harmonic error within the spindle rotation is analyzed. Then, based on this analysis, coordinate systems are developed to propagate the errors, thus deriving the input-output model for the accelerometer including the first harmonic errors. Analysis of this model reveals the mechanism by which the first harmonic errors introduce the pseudo-second-order term into the accelerometer. Finally, the first harmonic motion of the centrifuge spindle is monitored using a high precision micrometer to compensate for the pseudo-second-order term and reduce its effect on the second-order coefficient from 10-6 rad/(s·g2) to 10-8 rad/(s·g2). |
| Key words: Precision centrifuge Dynamic balance Pendulous integrating gyroscopic accelerometer Second-order coefficient Calibration |
