The Analysis & Accuracy Control Technology Of The K0 Drift Coefficient Of The Gas-floated Gyroscope

The gas-floated gyroscope is one of the most important inertial instruments measuring the rotational speed of the inertial platform as a sensor, the accuracy of which determines the accuracy of the inertial space reference system directly. It is very hard to control the K0 drift coefficient of the gyroscope. The qualified rate of the gyroscope was reduced to no more than 10% at one time, which affects production schedule and increases production costs greatly. So this paper conducts some research on the K0 drift coefficient of the gyroscope.Firstly, this paper makes the comparative experiment of the main factors influencing on the K0 drift coefficient, and concludes that the vortex torque of the air bearing is the most important factor influencing on the K0 drift coefficient. Accordingly, the further research on the vortex torque is conducted: the mathematical & FEM model of the characteristic, the vortex torque & the manufacturing errors of the air bearing are established; the regularity of the manufacturing errors influencing on the vortex torque is analyzed by the parameterized program of MATLAB. And the research findings are achieved: the roundness error of the floater & the assembly error of the narrow slit are the most important factors influencing on vortex torque, and the value of which is determined by the setting angle of the floater & the parallelism error of the narrow slit. Then, the optimum value of the structural parameters of the radial clearance & the narrow slit clearance of the air bearing are found out by Sensitivity Analysis. Moreover, this paper conducts some research on the bearing capacity & bearing stiffness of the air bearing, which are the most important factors influencing on the reliability of the gyroscope. The mathematical & FEM model are established, and the regularity of the structural parameters influencing on the bearing capacity & bearing stiffness of the air bearing is analyzed, which provides theoretical basis for the optimum design of the air bearing.Based on the research conclusions, this paper puts forward some technical measures of accuracy control of the K0 drift coefficient of the gyroscope, i.e. controlling the roundness error of the floater strictly; choosing suitable operating point of the gyroscope; introducing precision assembly technology & optimizing the structural parameters of the air bearing.Lastly, the vortex torque & bearing capability of the air bearing are measured by the designed experiment, and the experiment result is compared with the theoretical calculation, which verifies correctness of the mathematical model & numerical methods of this paper.