Signal feature extraction base on fractal dimensions of time-frequency domain

In this paper, vibration signal multifractal method was researched, multifractal on time-frenquency domain was an energy fractal and the signal feature extraction was based on the analysis of its energy ditributing. The method analysed signal on time-frequency domain to characterize the distributing of its frequency or energy, and the signal´s feature was extracted by fractal dimension. After the signal was changed to time-frequency domain by Hilbert-Huang transform, general dimension Dq would be calculated from the signal in time-frequency domain by least square method. In the end, examples of emulator and practical application proved that this integrated method was feasible.