工程爆破

2002, (03) 5-12

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爆破条件对爆破震动信号分析中小波包时频特征的影响
INFLUENCE OF BLASTING CONDITION ON TIME-FREQUENCY CHARACTERISTICS OF BLASTING VIBRATION SIGNALS WITH WAVELET PACKETS ANALYSIS

宋光明,曾新吾,陈寿如,吴从师
SONG Guang ming 1, ZENG Xin wu 1, CHEN Shou ru 2, WU Cong shi 3 (1 College of Science,National University of Defense Technology,Changsha 410073,China; 2 College of Resource and Safety Engineering,Central South University,Chan

摘要(Abstract):

非平稳信号的小波包分析是在小波变换基础上发展起来的 ,它对小波分析中没有细分的高频部分进一步分解 ,从而能够对信号局部信息进行更为精细的掌握。爆破条件是影响爆破震动时频特征分布的主要因素之一。本研究中 ,针对在不同段药量、不同微差间隔时间及近似相同的其它条件下产生的爆破震动信号 ,运用小波包分析方法对其进行了时频分析 ,主要探讨了段药量、段微差间隔时间对爆破震动时频分布的影响规律。段药量对爆破震动波形时频特征的影响主要体现在各层小波包主振频带内的细节信号峰值质点振速方面 ,各细节信号的峰值质点振速随段药量增加而增大 ,但主振频带分布保持基本的一致性 ,同一主振频带下小波包细节信号的阻尼比也趋于一致 ;段微差时间间隔对爆破震动时频特征的影响主要表现在 :延长各主振频带小波包细节信号的振动持时 ,不同微差单段波形的叠加增加了主振频带个数 (优势频率个数 )并使各频带内的优势频率值有微弱增大的趋势
Wavelet packets analysis method for non stationary signals is a development of wavelet transform and it can decompose higher frequency band which wavelet analysis lays aside So,it is an easy way for gaining further detailed localized information about non stationary signal Blasting condition is one of main influencing factors for the time frequency characteristics of blasting vibration In this study,the authors uses wavelet packets analysis for analyzing the time frequency characteristics of blasting vibration signals produced under the conditions of different explosive charges,different millisecond delay intervals and approximately same other conditions,and makes an approach to the law of which explosive charges and millisecond delay intervals influence the time frequency distribution of blasting vibration The influence of explosive charges on time frequency characteristics is mainly embodied in the peak particle velocities of the detailed signals with the wavelet packets analysis,and the peak particle velocities of the detailed signals increase with the increase of explosive charge per interval However,the distributions of dominant frequency bands show no difference basically,and the structural damping ratio coefficients of the detailed signals under the same dominant frequency band go unvarying The influence of delay intervals on the time frequency characteristics includes that they extend the vibration duration of the detailed signals under each dominant frequency band,add the number of dominant frequency band or dominant frequency peak through the superposition of the delay varied waveforms,and make the dominant frequency peak have a increasing trend

关键词(KeyWords): 爆破条件;小波包分析;时频特征;爆破震动
Blasting condition;Wavelet packets analysis;Time frequency characteristics;Blasting vibration

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基金项目(Foundation): 国家自然科学基金 (4 0 0 740 2 5 /D0 40 9)

作者(Author): 宋光明,曾新吾,陈寿如,吴从师
SONG Guang ming 1, ZENG Xin wu 1, CHEN Shou ru 2, WU Cong shi 3 (1 College of Science,National University of Defense Technology,Changsha 410073,China; 2 College of Resource and Safety Engineering,Central South University,Chan

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