考虑弯扭耦合作用的转子-挤压油膜阻尼器系统的碰摩响应特性分析

研究了支承在挤压油膜阻尼器上的Jeffcott转子系统的转静件碰摩的弯扭耦合振动特性。建立了系统运动方程，分析了各参数对系统响应的影响。仿真计算结果表明碰摩刚度对系统响应的影响十分明显，增大碰摩刚度更容易使系统响应的周期解失稳；不平衡参数增大，导致系统响应的振动幅度增大，系统更容易出现碰摩现象，进而导致系统周期解失稳；随着扭转刚度的增大，扭转角度变化幅度与快慢均发生变化，在刚度较低时，扭转角变化幅度随时间变化较慢；随着扭转刚度的增大，扭转角幅度变化明显加快；当扭转刚度继续增大，扭转角的幅度变化反而变慢。研究发现，系统响应具有两条通向混沌的道路，即阵发性通向混沌的道路和拟周期通向混沌的道路。

Character Analysis of Rub-Impact of Rotating -State with Transverse and Torsional Coupled Vibration of a Jeffcott Rotor

With the rub-impact of rotating-state taken into acc ou nt, the transverse and torsional coupled vibration of a Jeffcott rotor system su pported on SFD is investigated in this article. The motion equation of the syste m is derived and the influence of all kinds of parameters to the response of th e system is analyzed. It is demonstrated that the response of the system is infl uenced very apparently by the stiffness of rub-impact. With the growth of the r ub-impact stiffness, the periodic solution of the system becomes unstable. The response becomes violent with the growth of unbalance. The phenomenon of rub-im pact, which results instability of the periodic solution, is easily in being. Wh en the torsional stiffness grows, the amplitude and speed of the torsional angle are both changed. When the torsional stiffness is relatively small, the amplitu de of torsional angle changes slowly. With the growth of torsional stiffness, th e amplitude changes more quickly. When the stiffness grows to certain extent, t he torsional angle changes slowly again. It is found that there are two routes l eading the response to chaos, the intermittence to chaos and quasi-period to ch aos.