摘要
以工程实测爆破震动信号为分析对象,使用EEMD信号分析方法将爆破震动信号分解得到多个固有模态（IMF）分量,在时域、频域进行Hilbert变换求出IMF分量的Hilbert能量,对比分析各IMF分量能量在总能量中所占百分比,研究爆破震动能量在频域、时域的分布规律。在频域能量主要集中在5-40 Hz内,该频带内的能量占总能量的97.55%,在高频和低频能量分布较少,其中大于40 Hz部分能量占总能量的2.2%,小于5 Hz部分能量占总能量的0.25%,表明爆破震动能量是集中分布在某个较窄频带范围内。在时域能量主要集中在0.1-1.0 s范围内,其中,时域的高频能量震动作用时间短、低频能量震动作用时间长,从而揭示了爆破震动强度相同条件下频率越低危害性越大。
The monitoring of blasting vibration signals in rock masses is decomposed into several IMF components by analyzieal method of EEMD. In the time and frequency domain,the Hilbert energy of IMF components is obtained by Hilbert transformation. Through comparative analysis of various proportions of IMF component energy in total energy of the original signal, the distribution regularities of blasting vibration signal energy in frequency and time domain can be studied. Energy in the frequency domain is mainly concentrated in the range of 5 -40 Hz （95.55%） with small amount of distribution in high frequency （2.2%） and low frequency （0.25%）. For time domain, energy is mainly concentrated in the range of 0.1 - 1.0 s. The time of high frequency vibration energy is short, while the one of low frequency energy is long, which indicates that in the same blasting vibration energy, the lower the frequency is, the greater damage of blasting will be.
出处
《爆破》
CSCD
北大核心
2016年第4期22-26,83,共6页
Blasting
基金
国家重点基础研究发展计划(973)项目(2015CB057904)
