摘要
针对摩擦转子系统动力特性建立一种耦合分析模型。结合摩擦热冲击温度方程和转子热弯曲方程,推导转子热弯曲与温度直接相关的微分方程,进而建立摩擦转子动力方程与热冲击温度方程耦合的时变方程。该耦合方程既包括摩擦力冲击和热冲击对转子动力特性的影响,也包括振动特性对摩擦热量的影响。运用该耦合模型,分析某实际发电机转子摩擦情况下的振动特性。给出摩擦截面碰摩力、温度、转子弯曲变形和振动波形随摩擦时间的变化情况,结合频谱图分析不同碰摩情况下振动谐波成分,得到振动随时间逐渐发散和波动的过程。给出碰摩位置和转速对摩擦振动的影响。运用分析结论解释某实际机组发生的摩擦现象。
To analyze the rotor to stator rub dynamics, a coupled nonlinear differential equations with time variable coefficients is set up. In the coupled differential equations, the transient heat conductin equation and thermal bow equation are combined together with the rotor dynamic equation. Rub induced force impact and thermal impact are contained in the coupled equations. The thermal bow can be obtained directly from the asymmetric temperature. The feedback from impact force to vibration and vibration back to asymmetric heating can be calculated from the coupled equations. Rub induced contact force, asymmetric temperature distribution, thermal bend and vibration characteristics are analyzed with a generator rotor model. Harmonic components are analyzed by using frequency specturm. As a result of this calculation, the process of vibration divergence and fluctuation with time are obtained. The effects of rub location and rotating speed on the rub system are studied. A rub-induced vibration occurring in a real turbine is given. Abnormal phenomenon during rub is analyzed and explained by using the model.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第7期102-107,共6页
Journal of Mechanical Engineering
基金
国家高技术研究发展计划资助项目(863计划
2007AA04Z434)
关键词
摩擦
振动
旋转机械
转子
Rub Vibration Rotating machinery Rotor
