复线隧道爆破振动信号的HHT分析

HHT ANALYSIS ON THE BLASTING VIBRATION SIGNALS OF DOUBLE LINE TUNNEL

结合现场采集到的爆破信号,从实践验证HHT(Hilbert-Huang Transform)理论在爆破振动信号处理中的可行性。首先采用经验模态分解(EMD)提取爆破振动信号的固有模态函数(IMF)分量,对主成分分量作Hilbert变换,提取其包络曲线,得到实际延时爆破中的延时时间。再对原始信号经EMD得到的IMF分量进行Hilbert变换,得到信号的Hilbert能量谱,并从瞬时能量的角度研究了爆破振动不同频率的能量作用机理。从而验证了HHT方法的自适应强和高效性在爆破振动信号分析中的优良特性。

Combined with the original signals from engineering field, the feasibility of HHT theory trea- ting blasting vibration signal was demonstrated. First, the intrinsic mode function （IMF）was extracted by using the method of empirical mode decomposition（EMD）, Hilbert transform was conducted to the main component, and the envelope curve of it was obtained, then the actual delay time was got during delay blasting process. Moreover, the Hilbert transformation was conducted to IMF components after original signal was carried out by EMD, then the Hilbert energy spectrum was obtained, the energy function mech- anism in different frequency series was studied from the aspeet of the instantaneous energy. Strong adap- tivity and high efficiency of HHT theory in analyzing the blasting vibration signal were verified.