摘要
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具有特定层次结构且永不封闭椭圆形轨迹。随着频率的增大,混沌吸引子在相空间的形态表现为椭圆轨迹的长/短轴之比逐渐减小,混沌吸引子在相空间沿长轴方向收缩,沿短轴扩展并最终趋于稳定,信号高频噪声具有弱混沌特征。混沌吸引子形态的演化过程有助于爆破信号幅值、能量信息的精确提取和主频有效判别,为隧道爆破信号非线性特征提取提供了新的思路。
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.
作者
付晓强
俞缙
戴良玉
张会芝
黄凌君
杨悦
FU Xiao-qiang;YU Jin;DAI Liang-yu;ZHANG Hui-zhi;HUANG Ling-jun;YANG Yue(School of Civil Engineering,Sanming University,Sanming 365004,Fujian,China;Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University,Xiamen 361021,Fujian,China;Sanming Coffer Fine Chemical Industrial Co.,Ltd.,Sanming 365500,Fujian,China)
出处
《工程爆破》
CSCD
北大核心
2021年第1期36-44,共9页
Engineering Blasting
基金
福建省自然科学基金资助项目(2020J01390)
福建省中青年教育科研资助项目(JT180511)
三明市引导性科技资助项目(2019-S-28)
国家自然科学基金面上资助项目(51874144)。
关键词
隧道掘进
爆破振动
频率切片小波
混沌吸引子
tunnel excavation
blasting vibration
frequency slice wavelet
chaotic attractor
