Decompositionandenergydistributionofblastingvibrationsignal basedonsecondgenerationwaveletpacket(SGWP)
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摘要: 针对传统小波包在小波基选取方面与实测爆破振动信号波形匹配欠佳的问题,提出了基于插值细 分的二代小波构造方法,并通过引入移频算法,较好地解决了小波包隔点采样导致的频率混叠现象。结合应 用实例,对实测信号进行多尺度的提升小波包分解后,得到了爆破振动各个频带的能量分布,总结了爆破振动 信号频带能量的分布特征。分析结果表明,提升小波包(SGWP)算法可以真实反映振动信号的能量分布情 况,为研究爆破震动效应下的结构安全提供有效的分析手段。Abstract: Aimedtothepoormatchofthetraditionalwaveletpackettransform withthemeasured blastingvibrationsignalinthechoiceofwaveletbase,amethodwasproposedfortheconstructionof secondgenerationwaveletsbasedoninterpolationsubdivision.Andthefrequencyaliasresultedbydot interlacedsamplingwasovercomebyusinganalgorithm withfrequencyshift.Throughmulti-resolutiondecompositionofmeasuredsignals, energydistributionineveryfrequencybandwasobtained,by whichthedistributionfeaturesoftheblastingseismicsignalswereanalyzed.Analysisresultsshow thatthealgorithmfortheSGWPtransformcanreflecttheenergydistributionoftheblastingseismic signalsanditisaneffectiveapproachtoestimatingthestructuresafetyunderblastingvibrationconditions
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