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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：内燃机学报

所属单位：能源与动力学院

卷号：27

期号：4

页面范围：352-358

ISSN号：1000-0909

摘要：Combustion noise contributes a major part to diesel engine noise. This
   paper focuses on the separation of combustion noise using independent
   component analysis method. Firstly, to the complexity of diesel engine
   noise, FastICA algorithm is applied to separate the independent
   components from the measured acoustic signals. The non-Gaussianality of
   diesel engine noise is checked by kurtosis. The separated independent
   components such as combustion noise and fuel injection noise are
   identified according to the time information. Secondly, to the
   nonstationarity of diesel engine noise, this paper focuses on the
   extraction of time frequency feature using wavelet scalogram. Wavelet
   transformer is applied to analyze the separated independent components,
   and their features in joint time-frequency domain are extracted based on
   Morlet scalogram.

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