摘要
通过小波变换极大值点同信号突变点及其李氏指数之间的关系,采用小波变换极大值在多尺度上的变化规律来表征信号突变点的性质,从而确定信号有无奇异点并确定其位置,进而对桥梁进行损伤识别。将该理论应用到带裂缝悬臂梁有限元模型,通过模态、瞬态和静力试验采集信号,精确确定裂缝个数及位置。较之传统方法,该方法不仅可以达到经济方便的目的,而且检测结果更为精确可靠。
How to carry out the damage detection of the bridge by means of the characteristics of the discontinuity point denoted by the change rule of the maximal values of wavelet transform on multiscale,which are proven by the relations between the maximal value point of wavelet transform and the discontinuity point of the signal with its Lipschitz Exponent,is presented in this paper. And then the theory of the Lipschitz Exponent is applied to the FE model of cantilevers with clefts. The numbers of the clefts and the localities of those are positioned precisely with the signals acquired from the the modal test of numeric,and also the trasiant and the static ones. Not only the economical and the convenient aims can be achieved,but also the more precise and the more credible test results can be gained,comparing with the conventional methods.
出处
《公路交通科技》
CAS
CSCD
北大核心
2004年第11期30-34,共5页
Journal of Highway and Transportation Research and Development
