Citation

Fu X, Yu J. China Saf. Sci. J. 2021; 31(12): 53-61.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.12.008

PMID

unavailable

Abstract

In order to solve the difficulty in eliminating cross terms in time-frequency domain of tunnel blasting vibration signals as they tend to be influenced by test environment, MP-SPWVD combination algorithm was adopted to effectively suppress cross terms in time-frequency spectrum of micro-delay blasting vibration signals. At the same time, time-energy density method was adopted to accurately determine actual delay time of each section of detonators in tunnel initiation networks. The results show that MP-SPWVD algorithm can effectively reduce adverse effects of cross terms on signal energy amplitude and local region characteristics. Actual delay time between detonator segments can be adaptively judged by time-energy density distribution of MP reconstructed signal, which has a good application prospect. Moreover, delay discrimination accuracy of detonators is closely related to delay time. © 2020 China Safety Science Journal. All rights reserved.

Language: zh