识别桥梁断面颤振导数的快速相关特征系统实现算法  

IMPLEMENTATION OF EIGENSYSTEM REALIZATION ALGORITHM WITH DATA CORRELATION TO IDENTIFY FLUTTER DERIVATIVES OF BRIDGES

作　　者：李友祥[1] 祝志文[1] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,长沙410082

出　　处：《振动与冲击》2008年第8期117-120,共4页Journal of Vibration and Shock

基　　金：国家自然科技基金(50678067)资助

摘　　要：风洞试验是获取桥梁断面颤振导数最直接和有效的方法。由于高风速下各种噪声对振动信号的污染,造成高风速下颤振导数识别的难度加大,因此合理的算法选择显得特别重要。介绍了一种基于响应数据相关的特征系统实现算法(快速相关ERA),并提出了将该算法在桥梁断面颤振导数识别上的实现。然后以具有理论解的Theodorsen理想平板为例,通过数值仿真和系统识别得到了一定折算风速范围不同噪声水平下的颤振导数。识别的理想平板颤振导数与Theodorsen理论解的合理一致性,验证了算法的可靠性和鲁棒性。The paper presents the method of eigensystem realization algorithm with data correlation(ERA/DC), and describes its implementation in identifying flutter derivatives of bridges. Based on numerical simulation and system identification, the Theodorsen thin plate with theoretic solutions is employed to validate the suggested method under different noise levels. The reasonable agreement between the identified flutter derivatives and the theoretic solutions confirms the effectiveness and robustness of present method.

关 键 词：颤振 理想平板 相关ERA 数值仿真 鲁棒性 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]