A new technique based on traditional wavelet transform used in NVH application of internal combustion engine

The sound and vibration signal of internal combustion engine (ICE) is typically unsteady and very complex. Recently the wavelet transform, we see, is being widely used as a time–frequency representation. A new technique that is based on traditional wavelet transform and has many advantages over traditional spectrograms is proposed in this study. The performance of the new technique is validated by applying it to a numerical simulation and test signals. It is shown that the new technique is suited for complicated signals that contain multiple impacts and/or dynamic changes in time and frequency domain.