外环干扰力矩对陀螺加速度计测试精度的影响

摆式积分陀螺加速度计的外环干扰力矩包括仪表外环轴的摩擦力矩和交叉轴加速度引起的交变力矩。作者分析了引起摆式积分陀螺加速度计外环干扰力矩的主要原因,提出一种在高精度三轴测试转台上分离摆式积分陀螺加速度计外环干扰力,测试摆式积分陀螺加速度计精度的试验方法。该试验采用三轴转台中环转动速度随动摆式积分陀螺加速度计外环进动角速度,同时摆式积分陀螺加速度计陀螺摆的输出轴在整个试验中保持水平,从而分离仪表外环干扰力的方案。通过对试验数据进行分析,得出外环干扰力的存在影响了摆式积分陀螺加速度计测试精度,为改善摆式陀螺加速度计工艺以提高摆式陀螺加速度计的测试精度提供了依据。

Influence of outer gimbal disturbance torque on testing precision of PIGA

The outer gimbal disturbance torque of PIGA(pendulous integrating gyro accelerometer)includes the outer gimbal axis friction torque and the altemating torque caused by the intersecting acceleration.The paper analyzed the main reason of generating the outer gimbal disturbance torque of PIGA,and presented a new method for testing the precision of PIGA,which is by separating the outer gimbal disturbance torque of PIGA on high-precision three-axis test tumtable.In this test scheme,the tum speed of middle-gimbal of three-axis turntable followed the precession angular-velocity of PIGA outer-gimbal,and the output shaft of gyroscopic pendulum keep level in test,so the outer gimbal disturbance force of the instrument could be separated.The test shows that the existing of outer gimbal disturbance force influences the testing precision of PIGA,and this provides the technique basis for improving the testing precision of PIGA.