FU Yi-qiang1, CHEN Yu-shu1, HOU Lei1, LI Zhong-gang1,2
1.School of Astronautics, Harbin Institute of Technology, Harbin 150001, China；
2.School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract：A dynamic model of a dual-rotor system with nonlinear force of intermediary bearings was built, and Matlab was applicated for the numerical calculation and found that there is an obvious hysteresis characteristics which is similar to the high and low pressure rotor under the same parameters. And then, the influence of speed ratio of high and low pressure rotor, intermediary bearing’s radial clearance and damping ratio to system’s hysteresis characteristics were studied respectively. The studies found that the increasing of speed ratio grows a larger jump range while a narrower hysteresis region and a smaller critical speed which makes the hysteresis region move left. The larger the intermediary bearing’s radial clearance, the wider the hysteresis region, but the jump amplitude almost unchanged, and the increasing of radial clearance has produced little effect on critical speed. As for the damping ratio ,the larger it is, the smaller the system’s hysteresis region, jump range and critical speed will become, and the hysteresis region will move left. The study results will help researchers get a further understanding of the vibration of dual-rotor system which has the intermediary bearing.
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