| 刘小峰,张池,柏林,孙兵.转子碰摩波内调制特征提取及其故障诊断应用[J].电子测量与仪器学报,2021,35(2):94-100 |
| 转子碰摩波内调制特征提取及其故障诊断应用 |
| Extraction of internal modulation characteristics of rotor |
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| DOI： |
| 中文关键词: 转子碰摩 变分模态分解 波内调频 瞬时频率 |
| 英文关键词:rotor rubbing variational mode decomposition intra wave modulation instantaneous frequency |
| 基金项目:国家重点研发计划(2018YFB2001400)、国家自然科学基金(51975067)项目资助 |
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| Author | Institution |
| Liu Xiaofeng | State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044,China |
| Zhang Chi | State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400045,China |
| Bo Lin | State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400046,China |
| Sun Bing | State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400047,China |
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| 全文下载次数: 3 |
| 中文摘要: |
| 为深入分析不同转静碰摩故障引起振动响应信号波内调制特征的变化规律，以Jeffcott转子模型为基础，采用基于变分模态分解的Hilbert变换方法对不同碰摩故障仿真信号进行波内调制特征的提取与分析，揭示了碰摩转子的动力学特性与其故障信号波内调制特性间的关联机理。仿真结果表明，周期 k碰摩故障将导致振动响应信号中低频段波内调频模态的瞬时频率以1/k倍频为中心振荡，且振荡频率依然为1/k倍频，进而造成了频谱中的1/k边频带；在概周期碰摩故障中，波内调制频率为靠近1/k倍频的无理数倍频和整数倍频，且造成振动信号频谱中的无理数边频带。离心泵转子故障诊断试验表明，波内调制特征能够有效地对转子碰摩故障进行有效的诊断。 |
| 英文摘要: |
| In order to analyze the modulation characteristics of vibration response signals caused by different rotor stator rub impact faults, based on the Jeffcott rotor model, this paper utilized the variational mode decomposition and Hilbert transform to extract and analyze the intra wave modulation characteristics of different rub impact fault simulation signals, and reveals the relationship between the dynamic characteristics of rub impact rotor and the intra wave modulation characteristics of fault signals. The simulation results show that the period k rub impact fault can cause the vibration response signal in the medium and low frequency band to oscillate its instantaneous frequency at the center of 1/k octave, and the vibration frequency is still 1/k octave, which results in the 1/k side frequency band in the original frequency spectrum. In the quasiperiod rub impact fault, the internal frequency modulation is irrational octave and integer octave close to 1/k octave, which results in the irrational number side band in the original signal spectrum. The rotor fault diagnosis test of centrifugal pump showed that the intra wave modulation characteristics can effectively be used to identify the severity degree of rotor rub impact fault. |
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