模式自适应小波构造与添加及其在爆破振动信号分析中的应用

Pattern adapted wavelet construction and addition and its application in blast vibration signal analysis

小波分析中所用到的小波基既不是任意的也不是唯一的,同一信号使用不同的小波基进行分析时会产生不同的结果,如何解决适合爆破振动信号特征的小波基构造、添加及其实现等问题,始终是困扰广大研究者的难题。针对爆破振动信号具有持时短、突变快等特点,通过对从实测微差爆破振动信号中分离出的子信号进行模式自适应匹配,构造与实测爆破振动信号波形相似度高的小波基函数,然后将该爆破振动信号小波基添加到MATLAB小波分析工具箱中,并用于对微差起爆延时间隔的精确定位,结果表明所构造的模式自适应连续小波具有良好的应用效果,从而为爆破振动信号分析在实际工程中的应用提供了参考。

In wavelet analysis,wavelet basis used is neither arbitrary nor unique.Even for the same signal,using different wavelet basis may cause different results.How to solve problems of wavelet basis construction,addition and its application in blast vibration signal analysis is always a problem to puzzle researchers.Based on the characteristics of short-duration and abrupt variation for blast vibration signal,through the pattern adapted matching of sub-signal separated from a measured millisecond blast vibration signal,the wavelet basis with a high similarity to the shape of the measured blast vibration signal was constructed.Then the blast vibration signal wavelet basis was added to the Wavelet Toolbox in MATLAB and used to position accurately the millisecond delayed time interval for starting blast with micro-difference.The results showed that the pattern adapted continuous wavelet basis of a blast vibration signal has a good application effect,and the results provide an important reference for blast vibration signal analysis＇ application in engineering.