1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. College of Civil Engineering, Hunan City University, Yiyang 413000, China;
3. Hangzhou Transportation Investment Construction Management Group Co., Ltd., Hangzhou 310012, China
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.
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 Liang1,2, LING Tonghua1, CHEN Zenghui3,ZHANG Sheng2, YU Bin1. Identification of the real delay time of millisecond blasting based on an improved CEEMDAN method. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(20): 274-280.
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