结构时域识别的超单元法  

A super-element approach to structural identification in time domain

作　　者：李杰[1] 赵昕[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《振动工程学报》2005年第1期30-35,共6页Journal of Vibration Engineering

基　　金：国家杰出青年科学基金资助项目 (5 982 5 10 5 )

摘　　要：在实际应用中 ,传感器数目通常远远小于结构模型自由度的数目。而为了实现识别结果的唯一性 ,一般的时域识别方法要求测量信息是完备的。由于超单元法的分散识别能力 ,使得该方法可以在传感器数目有限的情况下实现大型结构的识别。首先建立了超单元模型 ,其次提出了对超单元模型进行参数化的方法 ,针对结构识别中的荷载未知问题对超单元的划分进行了讨论。最后用大型结构的识别算例对整体识别方法和超单元识别方法进行了比较。结果表明 :超单元法不但可以在传感器数目有限的情况下实现结构参数的完整识别 ,而且其识别效率远远高于一次完成型算法。Due to the limitation of the number of transducers available in practical application, the time domain identification methods can hardly be employed since measurement completeness condition should be satisfied for the uniqueness of th e identification results. A super-element approach is employed in this study to identify the structural parameters of large-scale structure in time domain . The most attracting feature of super-element approach is its dividing-and-c onquer ability and thus can be applied to identify large-scale structures using relatively small amount of transducers. The super-element model is firstly dis cussed in this study. Then a parameterization procedure based on the sensitivity of response forces is introduced to establish the identification equations of s uper-element. In order to decompose total structure into super-elements, some principles are proposed. Numerical examples show that the super-element approac h can not only identify all structural parameters, but also greatly improve the identification efficiency.

关 键 词：元模型 结构识别 传感器 算法 算例 参数化 自由度 大型结构 唯一性 有限 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程]