基于HGWOP的自由振动响应下桥梁断面颤振导数识别  

IDENTIFICATION OF FLUTTER DERIVATIVES OF BRIDGE DECKS UNDER FREE VIBRATION RESPONSE BASED ON HGWOP

作　　者：何旭辉[1,2,3] 段泉成 严磊 卢同庆 HE Xu-hui;DUAN Quan-cheng;YAN Lei;LU Tong-qing(School of Civil Engineering,Central South University,Changsha,Hu’nan 410075,China;National Engineering Laboratory for High-speed Railway Construction,Changsha,Hu’nan 410075,China;Hu’nan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structure,Changsha,Hu’nan 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075 [3]轨道交通工程结构防灾减灾湖南省重点实验室,湖南长沙410075

出　　处：《工程力学》2024年第10期33-42,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51925808,51808563);湖南省自然科学基金项目(2020JJ5754)。

摘　　要：基于节段模型弯扭耦合自由振动风洞试验,在现有的最小二乘原理的基础上引入了一种新的基于粒子群算法(Particle Swarm Optimization,PSO)和灰狼算法(Grey Wolf Optimizer,GWO)的混合算法(hybrid GWO with PSO,HGWOP)以搜索相关参数,从而更加准确地识别桥梁断面的颤振导数。通过对理想平板和某大桥在三种加权矩阵下基于传统迭代法和HGWOP的颤振导数识别结果进行对比分析,发现HGWOP不仅能够避免初值敏感性问题,在某一阶模态信号衰减迅速时进行准确地参数搜索,还能在相对复杂的加权矩阵下进行更加稳定和准确地识别。该文提出了一种新的颤振导数识别方法,并为更加科学且复杂的加权矩阵的应用提供了可能。Based on the section model of two-dimensional bending-torsional coupling free vibration of wind tunnel,a new hybrid algorithm based on Particle Swarm Optimization(PSO)and Grey Wolf Optimizer(GWO)is introduced on the basis of the existing least square principle to search relevant parameters,in order to accurately identify the flutter derivatives of bridge section.By comparing the flutter derivative identification results of the traditional iterative method and HGWOP under three kinds of weighted matrices for the ideal plane plate and a bridge,it shows that HGWOP can not only avoid the problem of initial value sensitivity and carry out accurate parameter search when a certain mode signal decays rapidly,but also have more stable and accurate identification under relatively complex weighted matrices.A new flutter derivative identification method is proposed,which makes it possible to apply a more scientific and complex weighted matrix.

关 键 词：桥梁工程 颤振导数 混合算法 参数识别 最小二乘法 

分 类 号：U441+.3[建筑科学—桥梁与隧道工程]