摘要
考虑磁流变阻尼器(Magnetorheological damper,简称MRD),研究典型工况下MRD对碰摩故障转子系统动力学特性的影响。基于双线性本构方程,建立磁流变阻尼器动力学模型,并将其引入到转子系统中,利用有限元法建立碰摩故障下转子-滚动轴承-MRD系统的动力学方程,并采用Newmark数值法进行求解,利用分岔图、轴心轨迹图及频谱图等进行对比分析。研究结果表明:合适的电流作用下,MRD能够有效缓解碰摩,使局部碰摩稳定到轻微的全周碰摩,增强系统的稳定性。在过大的电流作用下,会激发MRD的非线性,产生非协调频率成分,降低系统的稳定性。该研究结果可为磁流变阻尼器的设计及控制策略提供有益的指导。
Considering the magnetorheological damper(MRD),the influence of MRD on the dynamic characteristics of the rubbing fault rotor system under typical conditions is studied.Based on the bilinear constitutive equation,the dynamic model of magnetorheological damper is established and introduced into the rotor system.The finite element method is used to establish the dynamic equation of the rotor-rolling bearing-MRD system under rub-impact fault,and Newmark is adopted.The numerical method is used to solve the problem,and the bifurcation map,the axial trajectory map and the spectrogram are used for comparative analysis.The results show that the MRD can effectively relieve the rubbing under the action of suitable current,so that the local rubbing can be stabilized to a slight full-cycle rubbing and enhance the stability of the system.Under the action of excessive current,the nonlinearity of the MRD is excited,and the uncoordinated frequency components are generated,which reduces the stability of the system.The results of this study can provide useful guidance for the design and control strategy of the magnetorheological damper.
作者
张桂昌
王俊
马梁
李诚昊
ZHANG Gui-chang;WANG Jun;MA Liang;LI Cheng-hao;无(Civil Aviation University of China,Tianjin 300300,China;State Key Laboratory of Engine,Tianjin University,Tianjin300072,China;Tianjin University Renai College,Tianjin 301636,China)
出处
《机械设计与制造》
北大核心
2021年第1期210-215,220,共7页
Machinery Design & Manufacture
基金
国家青年科学基金(51705355)。
