|关键词: 转子 时频分析 故障诊断 裂纹 动力响应 非线性
|Fault Analysis of Rotor with Rub-Impact and Crack Based on Time-Frequency Analysis
TAO Hai-liang, ZUO Zhi-tao, GAO Qing, TAN Chun-qing
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
|Nonlinear dynamic model of rotor with rub and crack was established by the finite element method for research of diagnosis in rotor system with coupling faults. Vibration behavior of a rotor with crack and rotor-stator rub was studied separately at different speed. Then the response of a rotor with multi-faults was obtained to analyze dynamic characteristics of the system. The fault signals were analyzed by way of waveform, FFT spectrum and instantaneous frequency plot in combination with Hilbert-Huang spectrum (HHS). The results indicate the combination can reveal fault characteristics of rotor system comprehensively. 3X, 5X frequency components are found in cracked rotor at 1/3,1/5critical speed. The generation of crack in rotor system can lead to increase of response amplitudes, thus it can cause even more serious rub-impact fault. The results can provide verification and reference for fault diagnosis of the complex rotor system.
|Key words: Rotor Time-frequency analysis Fault diagnosis Crack Dynamic response Nonlinear