隧道爆破振动信号混沌分形特征研究

为了分析隧道延时爆破时滞信号动力系统的非线性特征,在对新悬泉寺隧道爆破信号准确采集的基础上,运用混沌理论研究了经频率切片小波变换后各频带重构子信号的混沌动力学行为.通过子信号吸引子相轨迹特征对隧道爆破信号系统状态进行了直观描述和定量分析.结果表明:隧道爆破振动信号具有混沌特征,不同频带子信号吸引子在二维相空间一定区域内...

Study on chaotic fractal characteristics of tunnel blasting vibration signal

In order to analyze the non-linear characteristics of the time-delay dynamic system of tunnel millisecond blasting vibration signal, the chaotic dynamic behavior of reconstructed sub-signals in each frequency band of frequency slice wavelet transform is studied by using chaotic theory on the basis of accurately collecting the blasting signal of Xinxuanquanshi tunnel. The state of tunnel blasting signal system is directly described and quantitatively analyzed by phase trajectory characteristics of sub-signal attractor. The results show that the vibration signals of tunnel blasting have chaotic characteristics, and the attractors of different frequency bands have a specific hierarchical structure in a certain area of two-dimensional phase space and never enclosed elliptical trajectory.With the increase of frequency, the shape of chaotic attractor in phase space shows that the ratio of long to short axis of elliptic trajectory decreases gradually, and chaotic attractor shrinks along the long axis, expands along the short axis and finally tends to be stable. High frequency noise of signal has weak chaotic characteristics. The evolution of chaotic attractor morphology contributes to the accurate extraction of blasting signal amplitude, energy information and effective identification of main frequency, and provides a new idea for the extraction of non-linear features of tunnel blasting signal.