基于WTMM的爆破振动信号奇异性分析
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摘要
为更细致的研究爆破振动信号中携带的能反映场地特征和爆破特征的重要信息,首先进行了完整场地、减震沟和预裂缝条件下的爆破振动试验,在获得的试验数据的基础上,运用小波变换模极大值(WTMM)方法对试验数据进行分析处理,得到了如下结论。小波变换模极大值线能够延伸至最小细节尺度处,模极大值的变化反映了此尺度时信号能量的变化趋势;由小波变换模极大值曲线图可以看出,该爆破试验场地上的爆破振动信号在lba(a为小波变换尺度)为4.5~6.0的范围内具有稳定的李氏指数,并且该指数能够很好地刻画爆破地震波携带的场地特征等奇异性信息;L ips-ch itz指数曲线图较为直观地反映了爆破场地的差异,同时得到了三种条件下的李氏指数分别为-3.69~-1.88、-3.54~-1.71、-4.14~-1.58,验证了减震沟比预裂缝有更好的减震效果。
Blasting vibration signals contain important information of field and blasting charateristics.In order to study them,some experiments are done in rude fields and ones with damped ditch or split.The method of wavelet transformation mode maximum(WTMM) are used to process experiment data and some conclusions are gained.First,WTMM line can be extended to the places with the smallest scale.The change of MM reflects changing trend of signal energy.Second,blasting vibration signal has steady Lipschitz exponent when its 1ba(a is the scale of WT) is between 4.5 and 6.0.What's more,the Lipschitz exponent can describe the charateristics of blasting vibration field and other singularity information.Third,the curve of Lipschitz exponent reflects differences among blasting fields.In three conditions,the Lipschita exponent are-3.69~-1.88、3.54~-1.71、-4.14~-1.58 in turn and damping effect of damped ditch is better than that of split.
Blasting vibration signals contain important information of field and blasting charateristics.In order to study them,some experiments are done in rude fields and ones with damped ditch or split.The method of wavelet transformation mode maximum(WTMM) are used to process experiment data and some conclusions are gained.First,WTMM line can be extended to the places with the smallest scale.The change of MM reflects changing trend of signal energy.Second,blasting vibration signal has steady Lipschitz exponent when its 1ba(a is the scale of WT) is between 4.5 and 6.0.What's more,the Lipschitz exponent can describe the charateristics of blasting vibration field and other singularity information.Third,the curve of Lipschitz exponent reflects differences among blasting fields.In three conditions,the Lipschita exponent are-3.69~-1.88、3.54~-1.71、-4.14~-1.58 in turn and damping effect of damped ditch is better than that of split.
引文
[1]娄建武.小波和分形理论在爆破振动效应分析中的应用研究[D].南京:解放军理工大学工程兵工程学院.2004.
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[2]娄建武等.岩石介质中爆破地震波的沟槽效应及作用范围研究[J].矿冶工程,2004,24(1):11—15.
[3]娄建武等.爆破震动信号的特征提取与识别技术研究[J].振动与冲击,2003,22(3):80—83.
[4]Law N F,S iu W C.Issues of F ilter for B inaryW avelet Trans-form,Center for Mu ltim ed ia S ignal Processing,HongKong,2002.
[5]娄建武等.基于小波包技术的爆破地震波特征提取及预报[J].振动与冲击,2004,24(3):261—267.
[6]李会方等.基于WTMM的多重分形图像去噪算法[J].计算机工程与应用,2003,25(4)54—56.
[7]Swanson M D,Twefik A H.A b inary W avelet Decompositionof B inary Im ages.IEEE Transaction Im age Processing for Pub-lication,5:1637:1650,1996.
[8]Jaber Borran M,Robert D.Nowak,W avelet-Based DenoisingUsing H idden M arkovModels.R ice Un iversity,Houston.
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