摘要
提出了小波变换用于早期损伤的识别的方法.对小波理论做了简介,并通过仿真实验验证小波变换对损伤识别的能力.通过观察连续小波变换(CWT)的小波系数的模极大值或者离散小波变换(DWT)中的细节信号,识别动(静)态信号中的奇异值,从而判别出损伤的位置.此方法仅需要有损伤的结构的响应信号,不需要未损伤结构的响应信号及其结构信息,所需的信号可以是静态的,也可以是动态的.将该方法应用到带裂纹的悬臂梁有限元模型,通过瞬态、静力分析采集信号,精确定位裂纹的位置和数量.与传统方法相比,该方法不仅可行性强,经济方便,而且检测结果更为精确可靠.仿真实验表明,小波变换的方法是有力可靠的结构早期损伤识别方法.
In this paper,the wavelet transform technique is employed for early-stage damage detection.Accordingly, the wavelet theory is first summarized,and the wavelet transform is then validated to detect structural damage via simulation testing.Subsequently,the damage can be positioned based on the maximal modulus regarding continuous wavelet transform （CWT） coefficient or detailed signal regarding discrete wavelet transform （DWT）,i.e.the static or dynamic singularity.In this method,either static or dynamic response signal from damaged structure,rather than undamaged structure,is required for this purpose.Through instantaneous and dynamic signal sampling,this method is used for the finite element （FE） modeling of cracked cantilever to accurately detect the cracking position and quantity.Compared with the traditional methods,this approach possesses feasible,economic and precise strengths.Consequently,the proposed wavelet transform method is proven effective for early-stage structural damage detection.
出处
《中国工程机械学报》
2007年第4期447-452,共6页
Chinese Journal of Construction Machinery
关键词
小波
悬臂梁
损伤识别
wavelet
cantilever
damage detection
