1537. Study on nonlinear dynamic of ball bearing-offset disk rotor system with whirling‑swing coupling vibration

Huiqun Yuan1, Mingxuan Liang2, Yingying Cai3

1School of Science, Northeastern University, Shenyang, 110819, China

2School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, China

3School of Civil Engineering and Mechanics, Huazhong University of Science and Technology,
Wuhan, 430074, China

1Corresponding author

E-mail: 1yuan_hq@163.com, 2mingliangxuan@163.com, 3caiybxf@163.com

(Received 14 July 2014; received in revised form 1 September 2014; accepted 11 September 2014)

Abstract. A dynamic model of ball bearing-offset disk rotor system with whirling-swing coupling vibration is presented, in which the rotor disk offset position and the swing vibration of disk are concerned. In the model of ball bearing, the bearing radial clearance, nonlinear Hertzian contact force and the varying compliance (VC) vibration are considered. Numerical methods are used to obtain the nonlinear dynamic response of the system under different disk offset values for considering the disk swing vibration or not. Effects of bearing radial clearance variation on the dynamic performance of the system under different rotor offset values are investigated. It is shown that the nonlinear dynamic of the offset disk rotor system enhances obviously when rotor disk swing vibration is considered. As rotor disk offset increasing, the sensitivity of critical speed to variation of the bearing radial clearance improves.

Keywords: ball bearing, offset disk rotor, whirling-swing coupling, nonlinear dynamic, bearing radial clearance.

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