Thermal-induced Bearing Stiffness and Clearance Variation Characteristics and its Effect on Vibration Response of Rotor System

doi:10.3901/JME.2022.13.147

Abstract

Abstract: Rolling bearing is widely used in rotor system, and its dynamic characteristics are one of the key factors to determine the dynamic characteristics of rotor system. Firstly, a single disk two fulcrum rotor bearing system test-bed is built, and the unbalance vibration characteristics of the rotor system during the warm-up and under the action of different lubricating oil temperature are studied. Secondly, an identification method of bearing stiffness and clearance based on rotor vibration response is proposed, and the stiffness and clearance of the bearing during the warm-up and under the action of different lubricating oil temperature are obtained. Finally, the dynamic model of rotor bearing system is established based on Lagrange method. The identification results of bearing stiffness and clearance are taken into the model as input conditions. The effects of speed, unbalance and lubricating oil temperature on the vibration response of rotor system and the vibration characteristics of the system during the warm-up are analyzed. The research results provide technical support for bearing performance parameter identification under thermal effect and vibration characteristic analysis of rotor system.

Key words: rotor-bearing system, dynamics, thermal balance process, hot oil, stiffness and clearance identification

CLC Number:

TG156

HAO Xu, YU Changxin, LIU Jun, HAN Qingkai, ZHAI Jingyu. Thermal-induced Bearing Stiffness and Clearance Variation Characteristics and its Effect on Vibration Response of Rotor System[J]. Journal of Mechanical Engineering, 2022, 58(13): 147-165.

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