| 小波能量商在汽车发动机故障诊断中的应用 |
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| 引用本文： | 李力,何婷.小波能量商在汽车发动机故障诊断中的应用[J].汽车工程,2009,31(2). |
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| 作者姓名： | 李力 何婷 |
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| 作者单位： | 三峡大学机械与材料学院,宜昌,443002 |
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| 摘 要： | 考虑发动机断火之后对振动信号的影响,基于4层小波包分解重构信号能量,构造了小波包能量商无量纲指标.通过该指标提取发动机断火前后信号的能量特征作比商,充分考虑了断火之后振动信号能量的阶跃特性,定量分析断火后信号能量变化的程度.采集东风EQ6100汽油发动机缸体正常、活塞敲缸异响、活塞销异响以及曲轴轴承异响等4种工况的振动信号,并应用小波能量商指标对试验信号进行分析,取得很好的效果.试验结果表明,小波能量商可以对发动机不同故障准确地识别分类.
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| 关 键 词： | 发动机 故障诊断 断火 小波能量商 |
The Application of Wavelet Energy Quotient to Fault Diagnosis of Automotive Enginep |
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| Li Li,He Ting.The Application of Wavelet Energy Quotient to Fault Diagnosis of Automotive Enginep[J].Automotive Engineering,2009,31(2). |
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| Authors: | Li Li He Ting |
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| Institution: | Li Li & He Ting College of Mechanical & Material Engineering,Three Gorges University,Yichang 443002 |
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| Abstract: | With the consideration of the effects of off-ignition on the vibration signals of engine,a dimensionless indicator-wavelet energy quotient(WEQ) is proposed based on the energy of signal reconstructed by four-layers wavelet packet decomposition.The energy features of signals before and after off-ignition are extracted respectively to calculate the quotient,and the changing extent of signal energy is quantitatively analyzed.Tests are conducted on Dongfeng EQ6100 gasoline engine,with vibration signals in four ... |
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| Keywords: | engine fault diagnosis off-ignition wavelet energy quotient |
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