Study on Diesel Combustion Noise Based on Independent Component Analysis and Time Frequency Analysis-Part I: Analysis of combustion noise
HU Zhao-yang · Transactions of Csice · 2009
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.