Nonlinear characteristic investigation of magnetorheological damper-rotor system with local nonlinearity  

作　　者：Jun WANG Yunfei LIU Zhaoye QIN Liang MA Fulei CHU 

机构地区：[1]State Key Laboratory of Tribology,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China [2]College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China

出　　处：《Chinese Journal of Aeronautics》2023年第2期111-126,共16页中国航空学报（英文版）

基　　金：supports from National Natural Science Foundation of China(No.11972204);Natural Science Foundation of Tianjin,China(No.19JCQNJC02500)。

摘　　要：Magnetorheological(MR)dampers show superior performance in reducing rotor vibration,but their high nonlinearity will cause nonsynchronous response,resulting in fatigue and instability of rotors.Herein,we are devoted to the investigation of the nonlinear characteristics of MR damper mounted on a flexible rotor.First,Reynolds equations with bilinear constitutive equations of MR fluid are employed to derive nonlinear oil film forces.Then,the Finite Element(FE)model of rotor system is developed,where the local nonlinear support forces produced by MR damper and its coupling effects with the rotor are considered.A hybrid numerical method is proposed to solve the nonlinear FE motion equations of the MR damper-rotor system.To validate the proposed model,a rotor test bench with two dual-coil MR dampers is constructed,upon which experimental studies on the dynamic characteristics of MR damper-rotor system are carried out.The effects of different system parameters,including rotational speed,excitation current and amount of unbalance,on nonlinear dynamic behaviors of MR damper-rotor system are evaluated.The results show that the system may appear chaos,jumping,and other complex nonlinear phenomena,and the level of the nonlinearity can be effectively alleviated by applying suitable excitation current and oil supply pressure.

关 键 词：Hybrid numerical method Local nonlinearity Magnetorheological damper Nonlinear vibration Rotor system 

分 类 号：V2[航空宇航科学技术]