The control accuracy of Single Gimbal Control Moment Gyroscope (SGCMG) is limited by the existence of interference factors such as dynamic imbalances. This paper analyzes the output torque disturbance of SGCMG from a dynamic perspective and verifies the influence weights of disturbance factors through simulations, providing a reference for the control of torque output stability in SGCMG. Firstly, considering factors such as static and dynamic imbalance, installation errors of the high-speed rotor system using the Newton-Euler method, a preliminary analysis of each subsystem is conducted. Secondly, considering disturbance factors such as frame speed, a dynamic model analysis is performed. Finally, based on actual parameter values, the characteristics of the system's output torque are analyzed through simulations. Experimental results show that the torque output process of the system is stable under ideal conditions. However, in the presence of disturbances such as dynamic imbalance, the stability of SGCMG's torque output process is influenced to varying degrees. The analysis of the influence weights of various disturbance factors is accomplished using principal component analysis.
Spaceborne two-dimensional turntable is the main carrier of the space camera and other optoelectronic equipment, and the stability of the thin-walled angular contact ball bearings used in its shaft system will affect the control accuracy and service life of the satellite. Research on slip rate, the deviation ratio of centroid whirl velocity and vibration of bearing with different pocket clearances, outer clearances and velocity and axial loads. For 71928AC type angular contact ball bearing, when pocket clearance is between 0.30-0.40mm, outer clearance is 1.60mm, the cage of bearing has better stability. According to the experimental results, after the parameter optimization, the bearing stability is enhanced. The research results provide a theoretical basis for the optimal design of angular contact ball bearing cages.
The laser coherent field imaging system emits multiple beams of laser from earth to space, and the laser scans remote space target by passing through turbulent atmosphere. Turbulent atmosphere is a key factor affecting imaging quality of the coherent field imaging system. Aiming at quantitative simulating of degradation imaging effect caused by atmospheric scintillation, the quantificational simulating experiment platform of atmosphere scintillation is established. Based on the simulating platform, the effect of different intensity turbulence on imaging quality is quantificationally researched. The research draws the conclusion that the greater fluctuation of atmosphere turbulence is, the more serious the degradation of imaging quality is. Thus, in order to improve the imaging quality, the turbulent atmosphere scintillation need to be restrained by signal processing method in the following research. The study provides a achievable quantitative simulating method of turbulent air scintillation for analyzing degradation imaging quality caused by the turbulent atmosphere scintillation.
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