刚度突变MDOF体系动力损伤识别
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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。
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.
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.
引文
杜修力,韩玲,姜丽萍,2006.一种高效的全局优化方法:经验遗传算法.北京工业大学学报,32(11):992—995.
何立志,2006.希尔伯特-黄变换(HHT)及其在结构损伤识别中的应用.北京工业大学,硕士学位论文.
姜丽萍,杜修力,2007.基于经验遗传-单纯形算法和结构模态参数识别结构物理参数的方法.地震工程与工程振动,27(4):116—121.
姜丽萍,2006.经验遗传-单纯形算法及其在结构损伤识别中的应用.北京工业大学,硕士学位论文.
李明,郝健,周桃玉,2008.土木工程健康监测研究进展.交通科技,6期:26—29.
张郁山,2003.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱.中国地震局地球物理研究所,博士学位论文.
Huang N.E.,Shen Z.,Long S.R.et al.,1998.The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis.Proc.R.Soc.Lond,454:903—995.
Yang J.N.,Lin S.L,Pan S.W.,2002.Damage identification of structures using Hilbert-Huang spectral analysis.15th ASCE Engineering Mechanics Conference,2(5):1—8.
何立志,2006.希尔伯特-黄变换(HHT)及其在结构损伤识别中的应用.北京工业大学,硕士学位论文.
姜丽萍,杜修力,2007.基于经验遗传-单纯形算法和结构模态参数识别结构物理参数的方法.地震工程与工程振动,27(4):116—121.
姜丽萍,2006.经验遗传-单纯形算法及其在结构损伤识别中的应用.北京工业大学,硕士学位论文.
李明,郝健,周桃玉,2008.土木工程健康监测研究进展.交通科技,6期:26—29.
张郁山,2003.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱.中国地震局地球物理研究所,博士学位论文.
Huang N.E.,Shen Z.,Long S.R.et al.,1998.The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis.Proc.R.Soc.Lond,454:903—995.
Yang J.N.,Lin S.L,Pan S.W.,2002.Damage identification of structures using Hilbert-Huang spectral analysis.15th ASCE Engineering Mechanics Conference,2(5):1—8.
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