摘要
针对环境激励下的塔式结构动力响应信息,采用小波变换实现结构损伤位置识别.受塔式结构多损伤影响,各损伤位置对应的小波细节信息的吉布斯振荡将会相互干扰.为消除获得信息之间的耦合影响,实现多损伤位置的识别.本文通过对损伤位置处结构动力响应信息的截断,将结构中各损伤置于不同信息区间,并将截断后的动力响应信息区间进行有效延拓,消除初始动力响应信息区间边界处吉布斯现象的影响,从而实现了结构多处损伤的识别.算例的分析结果表明:这种方法对于塔式结构多处损伤识别具有有效性和可靠性.
On the basis of obtaining the dynamic response information of tower structure under environment excitation, the wavelet transform is applied to detecting the structure damage position. But, the Gibbs fluctuation of wavelet detail information responding to every damage position of tower structure with multi-damage influences each other, which results in the difficulty to identify multi- damage position. To eliminate this coupling influence, the truncation of the dynamic response information of the damage position is developed to make different damage positions in different information range. Moreover, the truncated dynamic information is extended, and then every damage position of tower structure is identified. To verify the effects of the method, the examples were conducted and the results indicate that the proposed method has the validity and the reliability to detect the multi-position damages.
出处
《中北大学学报（自然科学版）》
CAS
北大核心
2009年第2期179-183,共5页
Journal of North University of China(Natural Science Edition)
基金
国家自然科学基金项目资助(10802073)
住房和城乡建设部2008年科技项目资助(2008-k4-28)
公安部应用创新计划项目资助(2008YYCXWJXY119)
关键词
信息截断
信息拓展
多损伤识别
小波变换
塔式结构
information truncation
information extension
multi-damage identification
wavelet transform
tower structure
