基于传递熵的梁结构损伤动力识别  

Dynamic damage identification for beam structures based on transfer entropy

作　　者：谢中凯[1] 刘国华[1] 吴志根[1] 

机构地区：[1]浙江大学水工结构与水环境研究所,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2012年第10期1880-1886,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50579081)

摘　　要：引入传递熵理论,利用梁上多点的加速度信号进行动力损伤识别研究.利用Abaqus软件分析只在主平面内弯曲振动的混凝土简支梁,通过折减指定单元弹性模量的方法模拟梁的弹性损伤.数值分析采用高斯白噪声激励,为了保证传递熵结果的可靠性,在每个损伤工况下均进行多次数据采样,利用各时间尺度上传递熵的均值进行损伤识别.基于梁上多点的加速度信号,利用核密度估计方法验证了直接使用线性化传递熵理论的合理性.通过定义损伤指标,表明传递熵在对混凝土结构进行损伤定量及定位方面均有良好的表现.Transfer entropy was introduced to detect the damage in a beam structure by acceleration signals. A simply supported concrete beam was analyzed by using Abaqus, and the bending vibration of the beam only exits in its principal plane was assumed during the analysis. Elastic damage in the concrete beam was simulated via reducing the elastic modulus in a specified element. Gaussian excitation was applied in numerical analysis. Signal data were sampled several times at each damage level to ensure the result of transfer entropy, and the mean value of transfer entropy at all time scales was used to identify the damage. The linearized transfer entropy method was validated by kernel density estimation method based on the acceleration signals of the beam. Transfer entropy was proved to be an effective tool to accurately identify the damage degree and locate the damage in concrete structures by defining two different damage indexes.

关 键 词：损伤识别 传递熵 核密度估计 损伤指标 

分 类 号：TU317[建筑科学—结构工程] TU528