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STUDY ON THE DAMAGE DETECTION OF SPACE STRUCTURE SYSTEMS BY SYSTEM IDENTIFICATION APPROACH

系统辨识法空间结构系统损伤检测研究

基本信息

批准号：
10650576
负责人：
HAMAMOTO Takuji
金额：
$ 2.18万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650576/
关键词：
Damage detection Shaking table test Space structure System identification

项目摘要

This study is concerned with the damage detection of space truss and frame structures by using small-scaled experimental models. These structures are composed of a large number of members. To carry out the damage detection of space structures effectively and efficiently, a system identification approach is promising. However, it is widely believed that the system identification is good for global damage detection but not so useful for local damage detection. To overcome this problem, in this study, the intermediate damage detection is incorporated between global and local damage detection. In the case of the damage detection of space trusses, the damaged region is inferred by using the change in the kinetic energy distribution before the pinpoint of damaged members. In the case of the damage detection of space frames, the damaged story is located and evaluated before the pinpoint of damaged portions within the damaged story. To enhance the accuracy and robustness of the damage detection scheme, moreover, local and higher-mode vibrations are excited in addition to global and lower-mode vibrations. In the case of space trusses, a series of impact hammer tests have been performed in order to excite local vibrations after a series of shaking table tests. In the case of space frames, a small vibration generator is installed in the experimental model in order to excite higher-mode vibrations after a series of shaking table tests. It is shown that the system identification approach is still very useful for the local damage detection of space structures by using a multi-level damage detection scheme.

本文采用小尺度试验模型对空间桁架和框架结构进行损伤识别研究。这些结构由大量的构件组成。为了有效、高效地进行空间结构的损伤识别，系统识别方法是一种很有前途的方法。然而，人们普遍认为，系统识别对于全局损伤检测是很好的，但对于局部损伤检测却不是很有用。为了克服这一问题，在本研究中，中间损伤检测被结合在全局损伤检测和局部损伤检测之间。在网架结构损伤检测中，利用杆件损伤前动能分布的变化来推断损伤区域。在对空间框架进行损伤检测的情况下，在确定受损楼层内受损部分的准确位置之前对受损楼层进行定位和评估。此外，为了提高损伤检测方案的准确性和稳健性，除了全局和低模振动外，还激励了局部和高阶振动。对于空间桁架，在进行了一系列振动台试验后，进行了一系列冲击锤试验，以激发局部振动。对于空间刚架，通过一系列的振动台试验，在试验模型中安装了小型振动发生器，以激发高阶振型。结果表明，该系统识别方法对于采用多层次损伤识别方案的空间结构局部损伤识别仍具有很大的实用价值。