A reconstruction method of vehicle interior noise signal
An in-vehicle noise and signal technology, applied in the field of in-vehicle noise signal reconstruction, can solve problems such as errors, and achieve the effects of improving reconstruction accuracy, reducing non-stationarity, and reducing modeling difficulty
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[0082] The normal noise source signal data obtained under high-speed working conditions is used below, such as image 3 As shown in the figure, the contribution analysis diagram of each key point determines the key noise source signal that affects the noise signal in the car. The data is preprocessed, the noise source signal sample library is obtained, and the number of neurons in the input layer of the BP network is determined to be n=4, and the output layer l=1.
[0083] Such as figure 1 As shown, it is a schematic flow chart of signal reconstruction in an embodiment of the present invention,
[0084] In the first step, the SDA method decomposes and reconstructs the data signal, and the data signal is decomposed by EMD to obtain a limited number of relatively stable IMF components and a trend item r n ;
[0085]
[0086] Use the EMD method proposed in this paper to solve the extreme point number and energy proportion of each IMF component, see Figure and Table 1, deter...
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