基于小波变换的微差爆破震动信号分离法

英文篇名：The Separating Means of Millisecond Blasing Vibration Signal Based on Wavelet Transform
中文刊名：地下空间与工程学报
英文刊名：Chinese Journal of Underground Space and Engineering
作者：凌同华 ; 李夕兵 ; 戴塔根 ; 彭振斌
英文作者：LING Tong-hua~(1 ; 2) ; LI Xi-bing~1 ; DAI Ta-gen~2 ; PENG Zhen-bin~2(1.School of Resources and Safety Engineering ; Central South University ; Changsha 410083 ; China ; 2.School of Geoscience and Environment Engineering ; Central South University ; Changsha 410083 ; China)
中文关键词：小波变换 ; 时-能密度分析法 ; 微差爆破 ; 信号时-频转换技术
英文关键词：wavelet transform ; means of time-energy analysis ; millisecond blasting ; time-frequency domain transform techniques
出版日期：2006-06-30
机构：中南大学资源与安全工程学院,中南大学资源与安全工程学院,中南大学地学与环境工程学院,中南大学地学与环境工程学院湖南长沙410083,中南大学地学与环境工程学院,湖南长沙410083,湖南长沙410083,湖南长沙410083,湖南长沙410083
年：2006
期：03
出版单位：地下空间与工程学报

摘要

采用震波叠加模拟法确定合理的微差延期时间,关键在于能否获取组成实测微差爆破震波的分段震波。基于小波变换的微差爆破震动信号分离法能较好地解决上述问题。首先,利用基于小波分析的时-能密度法,通过从实测爆破震动信号中识别出各段雷管实际的起爆时刻点,得到了爆破中所用雷管的实际延期时间。其次,利用信号时-频转换技术,从实测微差爆破震动信号中分离出各分段震波。最后,通过比较各分段震波在不同延期时间下的叠加效果,可以得到微差爆破的较优微差延期时间。以某地下工程爆破震动信号进行分析为例,对本方法的有效性作了检验。
The key to ascertaining reasonable delay time interval by the means of seismic waves superposition effect is to get each sub-signal from measured millisecond blast vibration signal.The separating means of millisecond blast vibration signal based on wavelet transform can solve successfully the problem mentioned above.Firstly,the authors make use of time-energy density analysis based on wavelet transform and get the real delay time by identifying the blast moment of short-delay detonators.Secondly,every sub-signal is separated from measured millisecond blast vibration signal by time-frequency domain transform techniques.Lastly,the optimized delay time interval is obtained by comparing the superposition effect of sub-signal in different delay time interval.The effectiveness of the proposed method is verified with time-energy density analysis of millisecond blasting vibration signals in a underground engineering.

引文

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