摘要
综合考虑滑动轴承油膜力支撑、柔性支承受外部激励等非线性因素的影响,建立一个两端柔性支承的刚性转子模型,运用4阶变步长Runge-Kutta算法对系统的动力学行为进行数值仿真,得到了刚性转子系统在不同外部激励幅值下随转速变化时的位移分岔图,以及特定参数下的相图、Poincaré映射图,直观揭示了系统的动力学特性。结果表明,中低速阶段,系统随着转速的提升出现了混沌、多周期、概周期、单周期等复杂动力学行为;在中速和高速阶段,系统主要是多周期和混沌运动的相互转迁,以及阵发性混沌运动现象的出现。外激励幅值的增大,会使得系统容易形成概周期运动,并导致轴颈-轴瓦处油膜力的增大。
Considering the influence of nonlinear factors such as oil film force support of sliding bearingand external excitation of flexible support,a rigid rotor model with flexible supports at both ends is established.The dynamics behavior of the system is numerically simulated by using the fourth-order variable step size Run-ge-Kutta algorithm,the displacement bifurcation diagrams of the rigid rotor system varying with rotationalspeed with different external excitation amplitudes,and the phase diagram and Poincaré map under specific pa-rameters are obtained. These diagrams directly reveal the dynamic characteristics of the system. The resultsshow that the complex dynamic behaviors such as chaos,multi period,almost periodic and single period appearwith the increase of rotating speed in the middle and low speed stage,in the middle speed and high speed stage,the system is mainly the mutual transfer of multi period and chaotic motion,and the emergence of paroxysmalchaotic motion. With the increase of the amplitude of external excitation,the system is easy to form almost peri-odic motion,and the oil film force at the journal bearing bush increases.
作者
王文斌
Wang Wenbin(School of Mechatronic Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《机械传动》
北大核心
2021年第6期46-50,共5页
Journal of Mechanical Transmission
