Abstract:

We present a wavelet packet and fractal technology to analyze the aeroengine hydraulic pipeline vibration signals with variable pressure. Firstly, we decompose aeroengine hydraulic pipeline vibration signals using the wavelet packet, and the fractal characteristics of pipeline vibration signals with variable pressure are validated by the reconstruction coefficients of the wavelet packet. Moreover, the fractal dimension changes of different frequency components are verified by analyzing and comparing the correlation dimensions of the main wavelet packets. The combination analysis shows that the wavelet packet and fractal combination technology can reflect fractal features of aeroengine hydraulic pipeline vibration signals under different pressure.

Key words: wavelet packet transformation；fractal；correlation dimensions；combination analysis