| 应用高阶时频分析方法诊断汽油机故障 |
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| 引用本文： | 贾继德.应用高阶时频分析方法诊断汽油机故障[J].内燃机工程,2009,30(1). |
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| 作者姓名： | 贾继德 |
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| 作者单位： | 蚌埠汽车管理学院,蚌埠,233011 |
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| 摘 要： | 高阶时频分布是高阶统计量与时频分布相结合的产物,适合于分析具有非平稳、非线性特点的汽油机信号.引入高阶时频分布,采用二阶、三阶、四阶矩谱,也称 Wigner 谱、Wigner双谱、Wigner三谱对一仿真信号进行分析对比发现:在多分量信号的识别上,应用CWD滤波后的Wigner三谱是1种较好的分析工具.将该方法应用于汽油机故障诊断的结果表明:谱的切片图能清晰分辨汽油机不同磨损状态下的故障信号,较好地实现了故障诊断目的.
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| 关 键 词： | 内燃机 汽油机 故障诊断 Wigner谱 高阶时频分布 |
Fault Diagnosis in Gasoline Engine Using Higher-Order Time-Frequency Distribution |
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| JIA Ji-de.Fault Diagnosis in Gasoline Engine Using Higher-Order Time-Frequency Distribution[J].Chinese Internal Combustion Engine Engineering,2009,30(1). |
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| Authors: | JIA Ji-de |
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| Affiliation: | Bengbu Automobile Management Institute;Bengbu 233011;China |
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| Abstract: | Higher-order time-frequency distribution(HOTFD) is the product which is combined by higher-order statistics and time-frequency distribution,it is suitable for analyzing non-stationary and non-linear signals.According to signal characteristics of gasoline engine,HOTFD was introdued,including the second-order,third-order,the four-order moment spectrum,which is also called Wigner spectrum,Wigner bispectrum,Wigner trispectrum.The analysis for a simulated signal indicates that the Wigner Trispectrum with Choi Wi... |
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| Keywords: | IC engine gasoline engine fault diagnosis Wigner distribtion higher-order time-frequency distribtion |
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