In millisecond blast engineering

the key to achieving millisecond blast is to ascertain reasonable delay time interval.Firstly

the authors make use of time-energy density analysis based on wavelet transform

and get the real delay time by identifying the blast moment of short-delay detonators.Secondly

every sub-signal is separated from measured millisecond blast vibration signal by time-frequency domain transform techniques.Lastly

the Optimized delay time interval is obtained by comparing the superposition effect of sub-signal in different delay time interval.The effectiveness of the proposed method is verified with time-energy density analysis of millisecond blasting vibration signals in an underground project.It shows a high theoretical and practical value

and establishes a theoretical and technical foundation for the study of controlling and forecasting blast vibration damage.