段数对爆破振动信号的时频特性影响分析

为了研究段数对爆破振动信号时频特性的影响，首先将实测的单段信号利用Matlab7.0编制程序，分别选取10，20，30，40 ms为微差间隔进行叠加，获取了4种微差间隔下不同段数的爆破振动信号，然后利用AOK时频分布与小波分析相结合的方法，从质点振动速度峰值、总能量、主频、频带能量的角度进行了研究。结果表明：随着段数的增加爆破振动信号质点振动速度峰值与主频存在收敛性；总能量和主频的持续时间几乎呈线性增加；频带能量比向高频发展，频带能量的持续时间延长。研究成果可全面揭示段数对爆破振动信号时频特性的影响，并为从能量的角度进行抗振、降振的研究提供参考。

Effect of segments on time frequency characteristics of blasting vibration signals

In order to study the influence of segments on time-frequency characteristics of blasting vibration signals,firstly,composed the millisecond intervals of 10,20,30,40 ms,using Matlab7.0 composite program,to obtain the blasting vibration signal with different segments in the 4 millisecond intervals;secondly,applied a combination of AOK distribution and wavelet analysis,studied from the view of particle vibration peak velocity,total energy,principal frequency and band energy.The results show that,along with the segments added,astringency is existed in particle vibration peak velocity and principal frequency of blasting vibration signal;the duration of total energy and principal frequency almost increase linearly;band energy ratio develops to high frequency;the duration of band energy is extension.The research results can overall reveal the influence of segments on time-frequency characteristics of blasting vibration signals.And provide analysis foundation to shakeproof and decreasing vibration study from the view of energy.