(中南工业大学机电工程学院， 长沙 410083)
摘 要: 对转子系统振动的线性化建模与分析，在非线性因素较为突出时，不仅导致定量上的误差；更重要的是，将忽略真实转子系统丰富的非线性振动现象，这对于机械故障分析与诊断是非常不利的。针对上述情况，提出了一种转子系统非线性振动的辨识建模方法，该方法仅需利用不平衡激励的周期位移响应，无需人工激振，数学处理、编程较为简单，便于实施。实验结果表明，该辨识建模方法是行之有效的。
关键字: 转子 系统辨识 机械故障诊断 非线性振动
（College of Mechanical and Electrical Engineering,Central South University of Technology, Changsha 410083）
Abstract:Linear mathematical models for vibrations of rotor systems may lead to not only quantitative errors but also the neglect of rich nonlinear dynamic behaviour of real rotor systems, which is unfavourable to mechanical fault analysis and diagnosis when the nonlinearities of the systems to be investigated exist evidently．A new technique for identifying and modeling rotor systems has been presented in this paper. It uses only displacement data of steady-state periodic responses imbalance-excited, and does not require any specially designed excitation. Moreover, mathematical operations and programming for it are relatively simple. The present technique is proved to be effective through mathematically modeling a real rotor.
Key words: rotor system identification mechanical fault diagnosis nonlinear vibration
