立井爆破振动信号混沌特征研究
Study on Chaotic Characteristics of Blasting Vibration Signal in Vertical Shaft
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摘要: 采用传感器井壁预埋法对冻结立井爆破井壁振动信号进行了准确采集,运用混沌理论研究了频率切片小波各频带重构子信号的混沌动力学特征。通过吸引子轨迹变化对立井爆破信号特征进行了直观描述和定性分析。结果表明:立井爆破振动信号具有混沌特征,混沌吸引子在相空间的形态以主振频率所处的频带为分界线,在低于主振频率的子频带范围内,随着频率的增加混沌吸引子在相空间体积逐渐扩展并稳定;高于主振频率的子频带,随着频率的增加混沌吸引子体积收缩且离散。爆破混沌吸引子体积的变化有助于信号主频、幅值和能量信息的精确提取和识别。Abstract: 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.
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Keywords:
- frozen shaft /
- blasting vibration /
- frequency slice wavelet /
- chaotic attractor /
- nonlinear analysis
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