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• W3036681111 abstract "Based on the techniques of sound intensity analysis, incomplete wavelet packet analysis (WPA) and artificial neural network (ANN), a WPA pre-processing method for noise-based engine fault diagnosis (EFD), so-called WPA–ANN model, is presented in this paper. The noises of an EFI gasoline engine under normal and fault states are measured and their contours of sound intensity level (SIL) are calculated by interpolation approach to initially investigate the possibility of a SIL-based EFD. Furthermore, an incomplete WPA model, which consists of a five-level discrete wavelet transform (DWT) and a four-level WPA, is developed and applied to the measured noise signals for extracting fault features of the engine, as is a multi-layered ANN model for engine failure classification by using the extracted features of the noises. To verify the proposed approach, the WPA–ANN model is extended to recognize other noise-related faults of the engine. The results suggest that the noise-based WPA–ANN models are effective for engine fault diagnosis. Due to its time–frequency characteristics and pattern recognition capacity, the WPA–ANN can be used to process both the stationary and nonstationary signals. In view of the applications, the proposed WPA–ANN model can be directly used in vehicle EFDs, and may be extended to other sound-related fields for failure diagnosis in engineering." @default.
• W3036681111 created "2020-06-25" @default.
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• W3036681111 date "2020-09-01" @default.
• W3036681111 modified "2023-10-17" @default.
• W3036681111 title "An engine-fault-diagnosis system based on sound intensity analysis and wavelet packet pre-processing neural network" @default.
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• W3036681111 doi "https://doi.org/10.1016/j.engappai.2020.103765" @default.
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