Study on Chaotic Characteristics of Blasting Vibration Signal in Vertical Shaft

The vibration signal of blasting shaft wall of frozen shaft was accurately collected by the method of sensor shaft wall embedded, and chaos dynamics characteristics of reconstructed sub-signals in different frequency bands of frequency slice wavelet are studied by using chaos theory. The characteristics of shaft blasting signal are described and qualitatively analyzed by the change of attractor trajectory. The results show that the vibration signal of shaft blasting has chaotic characteristics, and the shape of chaotic attractor in the phase space is divided by the frequency band of the main vibration frequency, in the sub-frequency band lower than the main frequency the chaotic attractor gradually expands and stabilizes in the phase space volume with the increase of frequency; the volume of chaotic attractor shrinks and discretizes with the increase of frequency in the sub-frequency band higher than the main frequency. It is helpful to extract and identify the main frequency amplitude and energy information of the blasting chaotic attractor.