爆破振动与车辆振动信号时频特性对比分析
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摘要
工程爆破以及过桥车辆都会引起桥梁的振动效应。根据现场实测数据,基于MATLAB软件信号分析处理平台,利用RSPWVD与小波分析相结合的方法对2种振动信号的时频特性进行对比分析,结果表明:车辆振动较爆破振动主频低且持续时间长,能量主要集中在10 Hz以内的低频部分且持续时间长并随着能量的降低其能量持续时间趋于稳定;爆破振动信号的能量主要集中在10~50 Hz之间,能量持续时间随频率的增大而有所延长。分析结果可为2种振动信号作用下桥梁动态响应的研究提供基础,也可为公路桥梁的振动控制提供依据,或可为类似的工程提供借鉴。
The engineering blasting as well as passing vihicle will cause the vibration of bridge.According to the monitored data and MATLAB software signal processing platform,the time-frequency of two vibration signals was analyzed comparatively using the combination of methods of RSPWVD and wavelet analysis.The results show that the dominant frequency of vehicle vibration is lower than that of blasting vibration but the duration is longer;the signal energy of vehicle vibration mainly concentrates within the low frequency 10 Hz and long duration,and with the decrease of energy,the duration time tendes to stability;and the signal energy of blasting vibration mainly focuses on between 10 and 50 Hz and the duration of energy amplifys with the increase of frequency.The results provide foundation to the study of bridge dynamic response under the action of the two vibration signals.It also can provide bases to the vibration control of highway bridge or the similar objections.
The engineering blasting as well as passing vihicle will cause the vibration of bridge.According to the monitored data and MATLAB software signal processing platform,the time-frequency of two vibration signals was analyzed comparatively using the combination of methods of RSPWVD and wavelet analysis.The results show that the dominant frequency of vehicle vibration is lower than that of blasting vibration but the duration is longer;the signal energy of vehicle vibration mainly concentrates within the low frequency 10 Hz and long duration,and with the decrease of energy,the duration time tendes to stability;and the signal energy of blasting vibration mainly focuses on between 10 and 50 Hz and the duration of energy amplifys with the increase of frequency.The results provide foundation to the study of bridge dynamic response under the action of the two vibration signals.It also can provide bases to the vibration control of highway bridge or the similar objections.
引文
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[2]李小珍,张黎明,张洁.公路桥梁与车辆耦合振动研究现状与发展趋势[J].工程力学,2008,25(3):230-240.
[3]王浩,柳墩利,程建军.爆破振动及列车振动荷载作用下隧道动力响应实测对比研究[J].铁道建筑,2009(12):69-73.
[4]赵国辉,刘健新.汶川地震桥梁震害分析及抗震设计启示1[J].震灾防御技术,2008,3(4):363-369.
[5]曹跃,赵明生,唐飞勇,等.近区爆破对大桥振动影响的监测分析[J].爆破,2008,25(2):82-84.
[6]池恩安,梁开水,赵明生,等.小波分解下单段爆破振动信号RSPWVD时频分析[J].武汉理工大学学报,2010,32(13):106-109.
[7]葛哲学,陈仲生.MATLAB时频分析技术及其应用[M].北京:人民邮电出版社,2006.
[8]飞思科技产品研发中心.MATLAB辅助信号处理技术与应用[M].北京:电子工业出版社,2005.
[9]赵明生,张建华,易长平.基于单段波形叠加的爆破振动信号时频分析[J].煤炭学报,2010,35(8):1279-1282.
[10]毕明芽,李名山,刘朝红,等.爆破振动预测误差的因素分析[J].爆破,2009,26(2):96-98.
[11]林世雄.爆破测试技术有关问题的探讨[J].爆破,2009,26(2):105-107.
[12]赵明生,梁开水,曹跃,等.爆破地震作用下建(构)筑物安全标准探讨[J].爆破,2008,25(4):24-27.
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