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| 基于EMD和频谱校正的故障诊断方法 | |
| 引用本文： | 刘立君,王奇,杨克己,李峰,何其皓.基于EMD和频谱校正的故障诊断方法[J].仪器仪表学报,2011,32(6). |
| 作者姓名： | 刘立君 王奇 杨克己 李峰 何其皓 |
| 作者单位： | 1. 浙江大学宁波理工学院机电与能源分院,宁波,315100 2. 浙江大学机械工程学系,杭州,310027 3. 宁波双林集团,宁波,315153 |
| 摘 要： | 提出了一种基于短时间样本的故障诊断方法,通过频谱校正提高频谱精度.首先对原始信号进行小波降噪,提高信噪比;然后进行经验模态分解,获取信号的各阶本征模态函数;分别对各阶本征模态函数进行希尔伯特解调分析,获得包含系统故障特征信息的调制信号;接着采用校正算法对调制信号进行频谱校正,频谱变换后获得精确的频谱;最后根据校正结果进行系统故障判别.实践表明,此方法具有速度快、精度高的特点,适合于设备的在线快速诊断. |
| 关 键 词： | 经验模态分解 希尔伯特变换 频谱校正 故障诊断 |
EMD and spectrum correction-based fault diagnosis method |
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| Liu Lijun,Wang Qi,Yang Keji,Li Feng,He Qihao.EMD and spectrum correction-based fault diagnosis method[J].Chinese Journal of Scientific Instrument,2011,32(6). | |
| Authors: | Liu Lijun Wang Qi Yang Keji Li Feng He Qihao |
| Affiliation: | Liu Lijun1,Wang Qi2,Yang Keji2,Li Feng3,He Qihao3(1 College of Mechanical and Energy,Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China,2 Department ofMechanical Engineering,Hangzhou 310027,3 Shuanglin Group Corporation,Ningbo 315153,China) |
| Abstract: | This paper proposes a new fault diagnosis method based on short-time signal sample,which adopts spectrum correction algorithm to improve spectrum accuracy for the purpose of accurate diagnosis.Firstly,wavelet de-noising is applied to improve signal-noise ratio,and empirical mode decomposition(EMD) is used to obtain the intrinsic mode functions(IMF) of the signal,then Hilbert transform is utilized to demodulate the IMFs to get the modulation signal that contains system fault information.Spectrum correction a... |
| Keywords: | EMD Hilbert transform spectrum correction fault diagnosis |
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