基于改进CEEMDAN方法确定微差爆破实际延期时间

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (20) : 274-280.

论文

张亮1,2，凌同华1，陈增辉3，张胜2，余彬1

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Identification of the real delay time of millisecond blasting based on an improved CEEMDAN method

ZHANG Liang1,2, LING Tonghua1, CHEN Zenghui3,ZHANG Sheng2, YU Bin1

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文章历史 +

摘要

针对微差爆破实际延期间隔识别中容易出现的模态混叠和伪分量问题，提出了一种CEEMDAN算法结合排列熵和奇异值分解理论联合识别微差爆破延期时间的方法。以某微风化花岗岩场地实测爆破振动信号为例，首先分别采用EMD算法与CEEMDAN算法对仿真微差爆破信号和实测微差爆破信号实际延期间隔进行识别，其次在CEEMDAN算法识别的基础上，用排列熵定量检测保留爆破震动特征的有效IMF分量，对熵值大于0.5的IMF分量利用奇异值分解作处理，并采用Hilbert变换绘制相应IMF分量的包络谱。结果表明：CEEMDAN方法能识别微差爆破延期时间，且能有效克服模态混叠现象。经CEEMDAN法处理的数据依旧存在虚假分量的问题，通过排列熵检测和奇异值分解降噪处理有效地压制了噪声，使有效IMF分量的包络谱变得更光滑，从而进一步降低干扰，实现微差爆破延期时间的准确识别。

Abstract

In view of the problems of modal aliasing and pseudo-component which are easy to occur in the real delay interval identification of millisecond blasting, a method that combined the CEEMDAN algorithm with permutation entropy and singular value decomposition theory was proposed. Taking the measured blasting vibration signal of a slightly weathered granite site as an example, the EMD and the CEMDAN algorithms were applied in the identification of real delay interval in the simulated millisecond blasting signal and the measured millisecond blasting signal, respectively. Then on the basis of CEEMDAN algorithm recognition, the effective IMF component retaining the blasting feature was quantitatively detected by the permutation entropy, the IMF component with entropy greater than 0.5 was processed by singular value decomposition, and the envelope spectrum of the corresponding IMF component was drawn by the Hilbert transform. The results show that the CEEMDAN method can identify the real time of millisecond blasting and can effectively overcome the phenomenon of mode aliasing. The data processed by CEEMDAN still has the problem of false components, the entropy detection and singular value decomposition were used to suppress the noise and pseudo components, making the envelope spectrum of the effective IMF component smoother, thereby further reducing the interference and realizing accurate identification of the real delay time of millisecond blasting.

导出引用

张亮1,2，凌同华1，陈增辉3，张胜2，余彬1. 基于改进CEEMDAN方法确定微差爆破实际延期时间[J]. 振动与冲击, 2020, 39(20): 274-280

ZHANG Liang1,2, LING Tonghua1, CHEN Zenghui3,ZHANG Sheng2, YU Bin1. Identification of the real delay time of millisecond blasting based on an improved CEEMDAN method[J]. Journal of Vibration and Shock, 2020, 39(20): 274-280

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