| Citation: | DENG Biao, CHEN Jianwei, GUO Yang, et al. Analysis of accumulation effect of turntable bearing and its influence on rotary performance[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2611-2622. doi: 10.13700/j.bh.1001-5965.2020.0499(in Chinese)
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In order to solve the problem of friction moment increase caused by rolling body accumulation during the rotating process of the space launch pad turntable bearing, this paper studied the influence of the change of clearance between the rolling bodies on the rolling. Based on the finite element analysis of the typical station of the transmitting station, the distribution law of raceway deformation and contact force of the rolling body in different contact types about the turntable bearing are compared, the influence of the time variation of raceway deformation and contact force of the rolling body on the clearance change of the rolling body is further analyzed after the determination of the geometrical relationship of rolling body and isolation block, and the relationship of clearance change and accumulation effect is established. The calculated deformation data of launch pad framework by finite element is consistent with the measured data by experiment, which verifies the reliability of the finite element calculation. The simulation results demonstrate that rolling body experiences alternative movement process of "climbing" and "going downhill" due to the axial deformation of the lower raceway. The radial deformation of raceway results in large clearance between the rolling bodies. The driving friction force of each rolling body changes constantly, and the motion state is time-varying. When there is an increasing clearance, the rolling body with constantly changing motion station will lead to the accumulation of the increased clearance, and as a result, the rolling bodies cluster. To eliminate the rolling body accumulation effect and study its influence on friction torque, the comparative experiment is conducted and the results indicate that the accumulation effect leads to the increase of the friction torque of launch pad and the change is remarkable.
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