Vibration response signals of vehicle are processed with wavelet analysis to reduce noise efficiently, and road surface roughness is analyzed by road response spectrum. Firstly, the sampling signals are decomposed with three-level Daubechies filter by multi-scales and one-dimensional wavelet and then its low-frequency part is reconstructed. When the scale is nine, the signals can be reduced efficiently. The noise reduction signals not only maintain amount of original signals, but also get the regularity in ...
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