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Main frequency band of blast vibration signal based on wavelet packet transform

机译：基于小波包变换的爆破振动信号主频带

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摘要

As a key parameter in blasting safety criteria, accurately describing the frequency's characteristics is of practical significance. Due to the deficiency of Fourier transform in the analysis of non-periodic and non-stationary signals, this study defined a wavelet frequency domain parameter, referred to as a main frequency band. A computational method associated with the wavelet packet transform is also proposed. To verify the feasibility of main frequency band and the proposed computational method in describing blasting frequency characteristics, an application is exemplified with field blasting vibration signals monitored in a mine. The effects of explosive charge and distance on main frequency band distribution characteristics are also studied. Results show that the main frequency band based on the computational method is a sensitive, accurate and efficient frequency parameter; it can accurately describe the frequency characteristics of blasting signals and effectively overcome the drawbacks in Fourier transform. When the explosive charge is constant, the span of main frequency reduces as a whole as the distance increases, and the frequency domain energy of blast vibration signals are concentrated mainly in the low-frequency range. When the distance is constant, the peak energy of blast vibration signals increase with the increase of explosive charge, without obvious change in main frequency band. To avoid the effects of interferences on frequency characteristics, the least square method is employed to eliminate signal trend components, and the wavelet threshold method with a hard thresholding function and the Birge-Massart strategy is applied in denoising. (C) 2019 Elsevier Inc. All rights reserved.
机译：作为爆破安全标准的关键参数，准确地描述频率的特性是实际意义。由于傅里叶变换在非周期性和非静止信号的分析中，该研究定义了一个小波频域参数，称为主频带。还提出了一种与小波分组变换相关联的计算方法。为了验证主频带和所提出的计算方法在描述爆破频率特性时的可行性，举例说明了在矿井中监视的现场爆破振动信号。还研究了爆炸性电荷和距离对主频带分布特性的影响。结果表明，基于计算方法的主频带是敏感，准确，有效的频率参数;它可以准确地描述爆破信号的频率特性，并有效地克服傅里叶变换中的缺点。当爆炸电荷恒定时，随着距离的增加，主频率的跨度随整体减小，并且喷射振动信号的频域能量主要集中在低频范围内。当距离是恒定的时，爆炸振动信号的峰值能量随着爆炸性电荷的增加而增加，没有明显的主频带变化。为了避免干扰对频率特性的影响，采用最小二乘法来消除信号趋势分量，并且具有硬阈值函数和Birge-Massart策略的小波阈值方法被应用于去噪。 （c）2019 Elsevier Inc.保留所有权利。

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  • 来源
    《Applied Mathematical Modelling》 |2019年第10期|569-585|共17页
  • 作者

    Chen Guan; Li Qi-Yue; Li Dian-Qing; Wu Zheng-Yu; Liu Yong;

  • 作者单位

    Wuhan Univ Inst Engn Risk & Disaster Prevent State Key Lab Water Resources & Hydropower Engn S 299 Bayi Rd Wuhan 430072 Hubei Peoples R China;

    Cent S Univ Sch Resource & Safety Engn 932 South Lushan Rd Changsha 410083 Hunan Peoples R China;

    Wuhan Univ Inst Engn Risk & Disaster Prevent State Key Lab Water Resources & Hydropower Engn S 299 Bayi Rd Wuhan 430072 Hubei Peoples R China;

    Fujian Jiangxia Univ Sch Engn 2 Xiyuangong Rd Fuzhou 350108 Fujian Peoples R China;

    Wuhan Univ Inst Engn Risk & Disaster Prevent State Key Lab Water Resources & Hydropower Engn S 299 Bayi Rd Wuhan 430072 Hubei Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Blast vibration; Main frequency band; Wavelet packet analysis; Time-frequency conversion; Signal denoising;

    机译：爆炸振动;主频带;小波包分析;时变转换;信号去噪;

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