Simulation of reducing signal noise of engine cold test based on improved wavelet threshold function
In order to obtain a more accurate signal transmission in the process of engine cold test,this paper proposes a wavelet improved threshold function to reduce the noise of fault diagnosis signals in the process of engine cold test on the basis of analyzing and summarizing the literature of wavelet noise reduction,and uses MATLAB to simulate and compare the noise reduction,and selects the high-speed cylinder head vibration signal noise of diesel engine cold test for simulation verification.The results show that the noise reduction method based on wavelet improved threshold function performs quite well.In the MATLAB simulation test,the signal-to-noise ratio of the improved threshold function is 26.941 3 and the root mean square error is 0.525 8,and in the diesel engine noise reduction simulation test,the signal-to-noise ratio of the improved threshold function is 3.086 8 and the root mean square error is 2.288 1.This noise reduction method has a better effect on the cold test vibration signal of diesel engine.
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