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Theoretical and experimental study on the self-excited vibration of a flexible rotor system with floating spline

Chinese Journal of Aeronautics 2023年第12期36卷 247-267页

作者： Haimin ZHU Li ZHANG Qingzhang CHEN Miaomiao LI Dan WANG Jia YAO Rupeng ZHU School of Automotive Engineering Changshu Institute of TechnologyChangshu 215500China Department of Computer Science Royal HollowayUniversity of LondonSurrey TW200EXUK National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China Xuzhou Heavy Machinery Co. LtdXuzhou 221000China

The internal friction of floating spline can cause self-excited vibration of a supercritical flexible rotor *** address this issue,a high-efficiency dynamic modeling method is proposed to investigate the self-excited vibration behavior and instability evolution of the *** are conducted to validate the theoretical *** coupled dynamic equations for the rotor system connected with the floating spline are derived through the combination of finite element method and lumped parameter model.A hybrid numerical approach of precise integration and Runge-Kutta method is adopted to examine the effects of the friction coefficient of spline’s tooth surface,torque,and eccentricity on the self-excited vibration of the rotor *** results show that the spline friction leads to negative damping and inputs energy into the rotor system under supercritical conditions,triggering self-excited vibration when the input energy exceeds a specific *** the same parameters,the experimentally obtained axial trajectory and primary frequency components are consistent with the theoretical results,verifying the accuracy of the proposed theoretical *** study can serve as a useful theoretical guide for the dynamic stability design of flexible rotor systems with the floating spline.

关键词： flexible rotor system Floating spline Friction Self-excited vibration Stability

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Optimization Method of Bearing Support Positions in a High-Speed flexible rotor system

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Journal of Donghua University(English Edition) 2020年第6期37卷 504-511页

作者：唐昌柯姜艳红刘静 College of Mechanical Engineering Chongqing UniversityChongqing 400044China High-Speed Railway Bearing Co. Ltd.Zhejiang 324000China School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China

Bearing support position is one of main factors affecting vibration characteristics of rotor systems. To optimize the bearing support positions in a high-speed flexible rotor system (HSFRS) based on the vibration characteristics, an optimization method of bearing support positions in the HSFRS is proposed. In this method, a finite element (FE) model of a high-speed flexible rotor (HSFR) was established. The natural frequencies and mode shapes of the HSFRS were used to obtain the initial design scheme of the bearing support positions. A frequency characteristic equation of the HSFRS was established to obtain the critical speeds of the HSFRS. And a dynamic model of the HSFRS was established to analyze the vibration characteristics for different bearing support position cases. The problem of optimizing bearing support positions in the HSFRS was solved by the developed method. The results showed that vibration amplitudes of the HSFRS were more stable when the bearing support positions were optimized. This study can provide a new method for optimizing bearing support positions of rotor systems.

关键词： flexible rotor system optimal design vibration characteristic bearing support position

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