双盘悬臂裂纹转子-轴承系统的动力学分析

Dynamics analysis of a dual-disk over-hung rotor-bearing system with crack

在考虑了非线性油膜力的基础上 ,建立了双圆盘立式悬臂裂纹转子 -轴承系统横向振动的动力学模型 ,利用Runge- Kutta法对该系统的动力学行为进行了数值研究 ,分析了该系统在有无裂纹两种情况下的分岔与混沌特性 ,通过对系统分岔图、Poincare截面图和幅值谱的分析 ,发现裂纹对该系统的动力学特性影响很大。由于油膜力和裂纹耦合的强非线性作用 ,在它的谱图上出现了 1/ 2、1/

Considering nonlinear oil-film force, a dynamic model of dual-disk vertical overhung rotor-bearing system vibration in lateral directions is considered. Its dynamic behaviors are investigated by numerical Runge-Kutta method. Its bifurcation and chaos characteristics are analyzed with and without crack fault. By analyzing the bifurcation plot, Poincare section plots and amplitude spectrums, it is found that the crack influences the dynamic characteristics of the rotor-bearing system greatly. On the account of the strong effect of the nonlinear oil-film force and crack on the system, 1/2X and 1/3X frequency components appear in the response spectrum map. The results may bring up theoretical references for fault diagnosis of the rotor-bearing systems.