【摘要】 建立了带有支座松动故障的转子系统局部碰摩动力学模型 ,利用数值积分和 Poincaré映射方法 ,对转子系统由于支座松动与局部碰摩耦合故障导致的非线性动力学行为进行了数值仿真研究 ,给出了系统响应随转子转动频率和偏心量变化的分岔图和最大 L yapunov指数图 ,分析了基础松动质量对转子系统动力学行为的影响 ,以及一些典型的 Poincaré截面图、相平面图、轴心轨迹和幅值谱图等。通过对某风机发生碰摩与基础松动耦合故障时的实测结果验证了数值分析的正确性。研究结果为旋转机械的故障诊断提供了理论基础和参考。更多还原

【Abstract】 Pedestal looseness and rubbing are the common faults in rotating machinery. A dynamic model of the rotor system with local rubbing and pedestal looseness faults is set up in this paper. The nonlinear dynamic behaviors are studied, which are caused by joint effect of pedestal looseness and rubbing fault using the numerical integration and Poincaré mapping methods. The bifurcation diagram and maximal Lyapunov exponent maps are given about the response changes with the frequency ratio and mass eceutricity. Some typical Poincaré sections, phase plane portraits and axes contrails were also given. The validity of the numerical analysis is verified by the coupled fault tests on an electrical fan.更多还原