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分析了在膜片式弹性联轴器不对中情况下,滑动轴承支撑的多盘转子系统的非线性动力特性和稳定性。联轴器不对中所产生的附加力和力矩作为施加在轴系上的外部激励。综合运用频谱、轴心轨迹、分叉图、Poincaré图和最大Lyapunov指数等方法,比较分析了转子-轴承系统在考虑联轴器不对中前后的动力响应和稳定性。研究表明联轴器不对中会引起2X,3X,4X甚至更高倍频的振动,其中2X振动占据主要地位,不对中对转子上节点的振动的影响随着其与联轴器的距离的增加而减小。不对中对轴系的1阶临界转速的影响可以忽略,当转子转速超过系统2倍1阶临界转速时,系统会发生油膜振荡,联轴器不对中会使系统发生油膜振荡的转速升高,同时对转子振动有一定的抑制作用。
The nonlinear dynamic characteristics and stability of the multi-disk rotor system supported by sliding bearings under the misalignment of diaphragm-type flexible coupling were analyzed. The additional forces and moments created by the misalignment of the coupling act as external stimuli on the shaft system. The dynamic responses and the stability of the rotor-bearing system before and after considering the misalignment of the coupling are analyzed and compared synthetically by means of spectrum, axis locus, bifurcation diagram, Poincaré diagram and maximum Lyapunov exponent. The research shows that the misalignment of the coupling can cause the vibration of 2X, 3X, 4X or even higher frequency multiplication. The 2X vibration occupies the main position. The misalignment affects the vibration of the node on the rotor as its distance from the coupling increases Decrease Misalignment of the shaft of the first order critical speed can be ignored, when the rotor speed exceeds the system 2 times the first order critical speed, the system will occur oil film oscillation, the coupling misalignment will make the system oil film oscillation speed increases, At the same time the rotor vibration has a certain inhibitory effect.