基于模式自适应连续小波能量谱的爆破振动信号特征分析Characteristics Analysis of Blast Vibration Signals based on Pattern Adapted Continuous Wavelet Energy Spectrum
张胜,王智德,黎永索,付贵海,刘志斌
摘要(Abstract):
爆破振动信号是一种典型的非平稳随机信号,采用傅里叶分析法求得的谱分布往往呈现锯齿状,不仅主振频率的具体位置难以确定,而且对于主振频率周边的频率成分以及各频率区间内的能量分布,亦难以直观显现。结合爆破工程实测资料,利用模式自适应连续小波变换具有良好的时频局部化性质,提出了模式自适应连续小波能量谱分析方法,从时间-尺度能量谱、尺度能量谱和时间能量谱3个方面对单段与多段爆破振动信号进行能量细化特征分析。研究结果表明:爆破振动信号小波能量谱直观定位了爆破地震波所发生的时间、频率以及能量的大小;单段爆破振动信号的能量在频域上主要分布在中高频部分,在时域上具有瞬发性和能量相对集中的特点;多段爆破振动信号的能量在频域上主要分布在低中频部分,在时域上具有多个峰值能量。
关键词(KeyWords): 爆破振动;能量谱分析;模式自适应连续小波;小波变换
基金项目(Foundation): 国家自然科学基金资助项目(51608183、51678226);; 湖南省自然科学基金项目(2018JJ3022)
作者(Author): 张胜,王智德,黎永索,付贵海,刘志斌
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