An analysis of the contact force between a floating rotor and a retainer bearing after rotor drop
WEI Peng 1 WANG Yunfeng1 YANG Yong 1 YAN Lijia 1 XU Longxiang 2
Author information+
1.Tianjin Key Laboratory of Microgravity Environment Simulation Technology, Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300458, China;
2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
The contact force between a rotor and a retainer bearing after rotor drop was studied by employing theoretical analysis and experiments in this paper.Firstly, based on the Hertz contact theory, a more accurate nonlinear contact force model between the rotor and the retainer bearing after rotor drop was established.The principle to measure the contact force was proposed.And then according to the measure principle, the measure rig was designed.The whole measure process was divided into calibration and measurement.Considering the nonlinear effects of the measure rig, the measure rig was firstly calibrated using impact force hammer under various impact forces.Then the contact forces were calculated using the acceleration responses of support ring after rotor drop.The rotor drop experiments for various initial rotational speeds were carried out.The acceleration responses of the support ring and rotor trajectories were analyzed.The experimental results show that the vibrations and impacts become larger with the increase of initial rotational speed, and then whirling motion is more likely to happen.The results also show that the maximum of vibration impact appears less than 0.1 second after rotor drop, but not appears at the first collision.The contact force was then used to recognize the equivalent mass me and equivalent stiffness ke in the established nonlinear dynamic model，and then the model was validated.
WEI Peng 1 WANG Yunfeng1 YANG Yong 1 YAN Lijia 1 XU Longxiang 2.
An analysis of the contact force between a floating rotor and a retainer bearing after rotor drop[J]. Journal of Vibration and Shock, 2018, 37(20): 251-258
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