Gyro Rotor Centroid Micro Displacement Adjustment System And Research-related Issues

As a key component of inertial navigation system, gyroscope works in a special environment, which has a extremely stringent requirements for reliability and stability of the gyro to meet. The main factors affecting gyro’s accuracy is its dynamic balance. It’s infeasible to upgrade the overall performance simply by improving the processing precision of each component for its high processing cost and technical requirements. So, in addition to ensuring the machining accuracy of the various components of the gyroscope, it’s essential to adjust the dynamic balance by means of dynamic balance correction.In order to solve the flexible gyro dynamic balance precision adjustment problems in the aviation industry, an automatic gyro’s dynamic balance adjustment device has been designed. The idea of modular design is adopted in the gyro dynamic balance adjusting device, which is divided into four parts:gyro clamping module, machine vision module, rotor adjustment module and rotor displacement measurment module. By adjusting the Centroid of the gyro rotor, the distance between the inertial principal axis and the principal axis of the gyro rotor is in the allowable range. Through the above operation, the accuracy requirements can be achieved.In this paper, gyro centroid micro-displacement adjustment software and adjustment effect factors are studied to achieve purpose of gyro centroid precision adjustment.Gyro dynamic balance adjustment procedure is established based on the software of Lab VIEW. The idea of modular design is adopted in the procedure, which is divided into four parts:system initialization module, parameter input module, threaded hole alignment module, rotor adjustment module, gyro removement module and manual control module. The work flow of each module is designed reasonably. The synchronization control between modules can be realized by using the notification communication of Lab VIEW. By using the IMAQ Vision module, threaded hole image acquisition, processing and fitting are achieved to ensure alignment of adjustment screw and screw hole; by using VISA node,serial communication between inductance sensor and PC is achieved to ensure the accurate measurement of displacement of the rotor centroid.The main affecting factors in the centroid adjustment of gyro rotor are analyzed, which are the fastening screw tightening torque and the axis angle of adjustment screw and screw hole. Adjustment screw rotation repeatability experiment and inductance sensors zero drift experiment are carried out, experiment results show that the adjustment screw rotation repeatability meets the requirements; by using difference of two inductance sensors, zero drift will not be an impact on the measurement of the displacement of the rotor centroid. by the micro-displacement adjustment experiment of gyroscope rotor centroid, the feasibility of the adjustment system is verified. Adjustment result shows the adjustment accuracy meets the design requirements.