For generator radiation noise

the algorithm for empirical mode decomposition with independent elements(IE-EMD) combining the advantages of independent component analysis algorithm and empirical mode decomposition algorithm was used to decompose the noise sources into a series of independent component by using a single observation signal to ensure the independence of isolated sound sources. At the same time

the wavelet transform technique was used to analyze the independent components and the corresponding relations between the different generator noise sources and independent components were determined by the time frequency analysis results which was verified by experiments. Results show that these independent components correspond to valve train noise

balancing shaft drive gear noise

timing gear noise and intake air noise.