Firstly, the TVF-EMD method is utilized to decompose the single-channel noise signal into several intrinsic mode functions (IMFs). A single-channel algorithm which combines time-varying filtering-based empirical mode decomposition (TVF-EMD) and robust independent component analysis (RobustICA) methods is proposed to separate them. It is difficult to accurately and effectively separate them. ![]() ![]() ![]() They mix in the time domain and frequency domain. However, both combustion noise and piston slap noise occur almost at the top dead center. Combustion noise and piston slap noise are the main noise sources of an internal combustion engine. The separation and identification technology of noise sources is the focus and hot spot in the field of internal combustion engine noise research.
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