核电站扩建工程爆破开挖振动信号的HHT分析

HHT Analysis on Vibration Signal of Blasting Excavation in Expansion of Nuclear Power Station

通过对田湾核电站二期扩建工程爆破施工的振动监测,得到了大量的试验数据,经由Hilbert-Huang变换(HHT)方法处理,分析论证了此方法运用于爆破地震波处理的科学性和可行性。第一步,用经验模态分解信号,得到了振动信号的固有模态分量,考虑到噪声信号的干扰,又对信号进行了改进算法的滤波处理;之后,对各个分量进行Hilbert变换,得到了信号的时频能量谱;针对时频能量谱分析,得到了信号的时频特性;从得到的瞬时能量谱中得到了3段微差起爆的间隔时间,为检测雷管的质量提供了新方法;而边际谱分析提供了一个频域分析的新角度。

Based on the blasting vibration monitoring in second-phase expansion project of Tianwan Nuclear Power Station,a lot of experimental data were obtained. Through the Hilbert-Huang Transform （HHT） method,the scientific and technical feasibility of this method using on treatment of blasting seismic wave were verified. At first, the EMD method was used to decompose the signal to get the IMF, and the interference of the noise signal was considered and filtered. From Hilbert transform for each component, the time-frequency energy spectrum of the signal was derived. According to the time- frequency energy spectrum analysis, time-frequency characteristic of the signal was represented. Intervals of differential initiation were obtained from instantaneous energy spectrum, which provides a new method to test the quality of detonator. Furthermore, marginal spectrum provides a new perspective in frequency-domain analysis.