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.
出处
《震灾防御技术》
2009年第3期321-327,共7页
Technology for Earthquake Disaster Prevention
基金
国家自然科学基金重点项目(50838001)
北京市教委科技创新平台(4700001401509)
