基于小波分析和尖点突变模型的裂缝转异诊断

Abnormality diagnosis of cracks based on wavelet analysis and cusp catastrophe model

对于带缝运行的水工混凝土结构,用小波分析和突变理论相结合的方法,建立裂缝转异诊断模型.结合工程实例,利用小波分析方法提取裂缝的时效变形,在此基础上建立裂缝的灰色尖点突变模型,提出裂缝的转异判据,结果表明,该方法是可行的和有效的.

An abnormality diagnosis model was developed for hydraulic concrete structures operating with cracks occurring in their bodies by use of the wavelet analysis and cusp catastrophe theory. In combination with observation data of dam cracks, the wavelet analysis method was adopted for extracting time-dependent deformation of cracks. Based on that, a grey cusp catastrophe model was established, and an abnormality criterion for crack diagnosis was put forward. The results show that the method is feasible and effective.