基于主成分分析的温度敏感性结构损伤识别  

Damage identification of temperature-sensitive structure based on principal component analysis

作　　者：常鹏[1,2] 王英剑 吴云峰 杨娜 CHANG Peng;WANG Ying-jian;WU Yun-feng;YANG Na(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;Beijing′s Key Laboratory of Structural Wind Engineering and Urban Wind Environment, Beijing 100044, China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]结构风工程与城市风环境北京市重点实验室,北京100044

出　　处：《振动工程学报》2019年第2期234-240,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51878034;51778045);高等学校学科创新引智计划(B13002)

摘　　要：为了避免由于温度变化使损伤识别发生误判,通过小波包变换和多元统计分析中的主成分分析方法构造损伤指标DIT,剔除或减少温度对损伤特征参数的影响。以简支梁模型为例,考虑温度影响,通过上述方法构造损伤指标DIT和损伤上限值UL,再对不同损伤位置、不同损伤程度对损伤指标的影响进行分析,结果表明,使用该损伤指标可以有效提高温度敏感性结构损伤识别的可靠性。基于某藏式古建的长期动态监测系统,分析了传感器两年的数据,损伤指标DIT未超过损伤上限值,表明结构没有明显的损伤发展。In order to avoid misjudgment of damage identification due to temperature changes, the wavelet packet transform and principal component analysis are used to construct damage indicator DIT for the purpose of eliminating or reducing the effect of temperature on the damage characteristics in the process of damage identification. A simple-supported beam is taken as research object, considering the temperature effect. Based on the methods mentioned above, the damage indicator DIT and damage upper limit UL are constructed. Then, the impact of damage locations and degrees of damage on the damage indicator is analyzed. It shows that using the damage indicator proposed in this paper is able to improve the reliability of the damage identification of the temperature sensitivity structure effectively. Based on the analysis of two years′ dynamic monitoring data of a Tibetan ancient building, it proves that the damage indicator DIT does not exceed the damage upper limit and there is no obvious damage to the structure.

关 键 词：损伤识别 温度敏感性 主成分分析 小波包变换 小波包能量谱 

分 类 号：O327[理学—一般力学与力学基础] TU311.3[理学—力学]