基于HHT方法的微差爆破延时识别

摘要

This paper proposes amplitude envelope recognition and instantaneous energy recognition for mil-lisecond blasting delay time by applying the self-adaptive EMD decomposition and energy density of meaning of Hilbert spectrum square based on HHT. Mainshock component signal amplitude envelope and instantaneous energy are obtained by EMD decomposing blasting vibration signal , identifying the main shock component and Hilber transformation. Millisecond blasting delay time is worked out by determining the mainshock component amplitude envelope and instantaneous energy spurt point based on explosive release of energy caused by blasting vibration signal speed measuring point or sudden increase energy principle. Study on project case shows that the delay time identified by the amplitude envelope and instantaneous energy is within the range of theoretical values, indicating that both methods are feasible to identify millisecond delay blasting.%基于HHT方法，利用EMD分解的自适应性和Hilbert谱平方的能量密度意义，提出微差爆破延时时间的幅值包络线识别法和瞬时能量识别法。先对爆破振动信号进行EMD分解并识别主震分量，然后作Hilbert变换，获取主震分量幅值包络线和信号瞬时能量，依据炸药能量的释放引发测点爆破振动信号速度或者能量突增原理，寻找主震分量幅值包络线和瞬时能量突峰点，便可计算微差爆破延时时间。工程实例分析表明：由幅值包络线和瞬时能量识别的延时时间都在理论值范围内，说明这2种方法识别微差爆破延时时间可行。