摘要
为解决传统的桥梁断面气动措施优化方法优化效率低下且搜索范围有限等缺点,提出了一种由风洞试验驱动,将Kriging代理模型和多点搜索策略相结合的主梁断面气动外形优化方法,对2000 m级悬索桥新型箱梁断面在倒L型导流板的水平板宽度L、下中央稳定板高度H和检修车轨道位置J构成的多参数设计空间内的气动外形进行优化。首先使用改进拉丁超立方试验设计方法获取设计空间内的初始样本点,通过风洞试验获得初始样本的颤振临界风速;然后建立设计参数和颤振临界风速的初始Kriging代理模型;接着使用新提出的并行加点准则添加更新点更新代理模型。最终优化获得了颤振性能最佳断面匹配的设计参数,通过风洞试验验证了优化结果的正确性。结果表明:Kriging代理模型结合多点搜索策略对桥梁断面气动外形进行优化,显著提高了优化效率;最优断面的颤振临界风速比原断面提高了51%,比单独设置倒L型导流板时提高了13%;倒L型导流板的水平板宽度L对颤振性能影响程度最为显著。
In order to solve the shortcomings of low optimization efficiency and limited search range of traditional aerodynamic measures optimization methods for designing bridge sections,a wind tunnel test-driven aerodynamic shape optimization method for main girder sections was proposed,which combines the Kriging surrogate model and multi-point search strategy.The aerodynamic shape of the new box girder section of a 2000 m suspension bridge was optimized in the multi-parameter design space composed of the horizontal plate width L of the inverted L-shaped deflector,the height H of the lower central stabilizer and the track position J of the maintenance vehicle.Firstly,the improved Latin hypercube experimental design method was used to obtain the initial sample points in the design space,and the flutter critical wind speed of the initial sample was obtained by wind tunnel test.Then,the initial Kriging surrogate model of design parameters and flutter critical wind speed was established.The update point was added to update the proxy model using the newly proposed parallel add-point criterion.Finally,the design parameters of the best section matching for the flutter performance were obtained by optimization,and the correctness of the optimization results was verified by wind tunnel test.The results show that the Kriging surrogate model combined with the multi-point search strategy optimizes the aerodynamic shape of the bridge section,which significantly improves the optimization efficiency.The flutter critical wind speed of the optimal section is 51%higher than that of the original section,and 13%higher than that of the inverted L-shaped baffle alone.The horizontal plate width L of the inverted L-shaped deflector has the most significant influence on the flutter performance.
作者
白桦
叶茂
杨光
高广中
BAI Hua;YE Mao;YANG Guang;GAO Guangzhong(School of Highway,Chang’an University,Xi’an 710064,China;China Communications Construction Co.,Ltd.,Rail Transit Branch,Beijing 101300,China)
出处
《振动与冲击》
北大核心
2025年第10期58-65,139,共9页
Journal of Vibration and Shock
基金
国家自然科学基金面上项目(52278478)
陕西省自然科学基础研究计划面上项目(2023-JC-YB-408,2022JM-198)
广西科技重点研发计划(桂科AB23026125)。
关键词
桥梁工程
气动外形优化
Kriging代理模型
风洞试验
箱梁
颤振性能
bridge engineering
aerodynamic shape optimization
Kriging surrogate model
wind-tunnel test
box girder
flutter characteristics
作者简介
第一作者:白桦,男,工学博士,正高级工程师,1979年生,E-mail:baihua15@chd.edu.cn。
