基于振动传递率函数和奇异值熵的结构损伤检测方法  

Damage Detection Based on Transmissibility and Singular Value Entropy

作　　者：杨斌[1] 程军圣[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《中国机械工程》2013年第17期2382-2385,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51075131;51175158);湖南省自然科学基金资助项目(11jj2026);中央高校基本科研业务费专项基金资助项目(531107040301);湖南大学汽车车身先进设计制造国家重点实验室自主课题资助项目(61075002)

摘　　要：为了直接通过结构振动响应提取损伤特征,对激励未知情况下的结构损伤进行检测,提出了基于振动传递率函数和奇异值熵的损伤检测方法。该方法首先通过振动响应获得振动传递率函数,然后对振动传递率函数序列进行相空间重构,求取其奇异值熵,通过奇异值熵的大小来识别损伤模式。实验结果表明,该方法能有效地识别结构的损伤模式。A damage detection method based on transmissibility and singular value entropy was proposed to detect damage in structures without acquiring the exciting force and the damage features were extracted directly from the vibration response. Transmissibility was obtained by taking the ratio of two response spectra, and then the singular spectrum value was acquired by singular value decompo- sition of the transmissibility matrix after phase space reconstruction, which can be used as an indicator {or damage detection. Experimental tests undertaken on a three story structure validate the proposed method.

关 键 词：结构损伤 振动传递率函数 相空间 奇异值熵 

分 类 号：O329[理学—一般力学与力学基础]