| 刚度突变MDOF体系动力损伤识别 |
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| 引用本文： | 高军,杜修力,李立云.刚度突变MDOF体系动力损伤识别[J].震灾防御技术,2009,4(3):321-327. |
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| 作者姓名： | 高军 杜修力 李立云 |
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| 作者单位： | 北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京,100124 |
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| 基金项目： | 国家自然科学基金重点项目(50838001):北京市教委科技创新平台 |
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| 摘 要： | 在结构损伤识别中,损伤发生的时间、损伤定位及损伤程度是三个核心问题。本文利用HHT方法结合经验遗传-单纯形算法分析刚度突变MDOF体系在地震波输入下结构的动力损伤识别问题,并以刚度突变4DOF结构体系在ELCentro地震波输入下结构动力特性识别为例进行了讨论。通过Fourier变换得到了结构损伤后的自振频率,利用HHT方法识别出结构损伤发生的时间,在此基础上运用经验遗传-单纯形算法识别出结构损伤后的刚度,从而确定了损伤的程度。
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| 关 键 词： | Fourier变换 HHT方法 经验遗传-单纯形算法 刚度突变MDOF体系 损伤识别 |
| 收稿时间： | 2009/4/30 0:00:00 |
The Dynamic Damage Identification of Stiffness Mutation Mdof System |
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| Gao Jun,Du Xiuli and Li Liyun.The Dynamic Damage Identification of Stiffness Mutation Mdof System[J].Technology for Earthquake Disaster Prevention,2009,4(3):321-327. |
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| Authors: | Gao Jun Du Xiuli and Li Liyun |
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| Institution: | The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China;The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China;The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The time of injury, damage location, and damage degree are the core factors of damage identification. In this paper, we conduct the comprehensive analysis of the Hilbert-Huang transform and Genetic-Simplex Algorithm in the dynamic damage identification of stiffness mutation MDOF system under the seismic loading, by taking a 4DOF system under the EL Centro seismic loading as an example. With the Fourier transform of the particle’s absolute acceleration time-history curves, the system’s inherent frequencies can be identified. The moment of stiffness mutation can be identified with Hilbert-Huang transform, and the particle’s stiffness can be recognized with empirical Genetic-Simplex algorithm. |
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| Keywords: | Fourier transform HHT Empirical genetic-simplex algorithm Stiffness mutation MDOF system Damage identification |
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