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标 题： A novel nonlinear model of rotor/bearing/seal system and numerical analysis
转子/轴承/密封系统的新型非线性模型及数值分析
作 者： Wei Li
Yi Yang
Deren Sheng
Jianhong Chen
关键词： Steam excitation  [蒸汽励磁]
Hamilton principle  [ 哈密顿原理]
Rotor  [ 转子]
Dynamic characteristics  [ 动态特性]
出版年： 2011
期刊名： Mechanism and Machine Theory
机构与机器理论
年卷期： 2011, vol.46, no.5
摘 要： A novel nonlinear model of rotor/bearing/seal system based on the Hamilton principle is proposed for steam turbine systems in power plants. The Musznyska model and unsteady bearing oil-film force model were applied to describe the nonlinear steam excitation force and oil-film force. The Runge-Kutta method was used to solve the motion equation of the rotor/seal/bearing system. The dynamic characteristics of the rotor/bearing/seal system were analyzed with bifurcation diagrams, time-history diagrams, trajectory diagrams, Poincare maps and frequency spectrums. The numerical analysis indicates that the seal force and the oil-film force influence the nonlinear dynamic characteristics of the rotor system. With the increase of rotation speed, the rotor system exhibits rich forms of periodic double-periodic, multi-periodic, quasi-periodic and chaotic motion. The combined impact of steam excitation force and bearing oil-film force may cause a severe vibration which seriously affects the safety and stability of the rotor. The presented model provides a theoretic foundation for further research on the ultra-supercritical steam turbines.

针对电厂蒸汽轮机系统，提出了一种基于哈密顿原理的转子/轴承/密封系统的非线性新模型。采用Musznyska模型和非稳态轴承油膜力模型来描述蒸汽激励力与油膜力的非线性特性。利用Runge-Kutta方法求解转子/密封/轴承系统的运动方程。通过分岔图、时间历程图、轨迹图、庞加莱图及频谱分析，研究了转子/轴承/密封系统的动态特性。数值分析表明，密封力和油膜力对转子系统的非线性动态特性具有显著影响。随着转速增加，转子系统表现出丰富多样的周期双周期、多周期、准周期及混沌运动形式。蒸汽激励力与轴承油膜力的共同作用可能导致剧烈振动，严重威胁转子的安全性和稳定性。该模型为超临界蒸汽轮机的进一步研究提供了理论基础。
中文内容为网络AI翻译，专业术语未必准确，仅供参考。

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