基于单段波形叠加的爆破振动信号时频分析

基于实测的单段爆破振动信号，利用Matlab7.0编制程序在0~120 ms内每隔单位毫秒进行两段波形叠加，研究不同微差间隔下的叠加信号振速峰值和主频的特征；并根据RSPWVD可以看作信号能量在时域和频域分布的明确的物理意义，从能量的角度探讨不同微差间隔下叠加信号的能量分布规律。结果表明：叠加信号降振率的最大值并非出现在单段爆破振动信号1/2周期的微差间隔处；叠加信号的主频不是连续变化的，具有一定的阶跃性，其持续时间随间隔时间的延长而增加；叠加信号的能量随着微差间隔延长具有明显的规律性，可尝试从能量的角度并考虑建(构)筑物对不同频率的选择放大作用对干扰降振进行研究。

Time－frequency analysis based on single－stage addition of waveforms of blasting vibration signals

Based on the measured single stage blasting vibration signals,using Matlab70 programming,two stages addition of waveforms was made in the 0~120 ms to study the vibration velocity peak value and the basic frequency characteristics of superposed in different millisecond intervals.Studied the energy distribution of blasting vibration signals in different millisecond intervals from the angle of energy,on the basis of that RSPWVD can be seen as energy of signals which distribution clear in time domain and frequency domain.The results show that the maximum value of the decreasing vibration rate of addition of waveforms really not present to millisecond intervals of single stage blasting vibration signals 1/2 cycle,the basic frequency has a certain stepped quality but not continuous changes,the duration is increased along with the interval time,addition of waveforms energy has obviously regularity along with the millisecond intervals extend.It can try studying the waveform resulting in vibration reduction that from angle of energy considering chooses versterking of constructions to different frequency.