不同风攻角下薄平板的颤振导数  

FLUTTER DERIVATIVES OF A THIN PLATE MODEL UNDER DIFFERENT ATTACK ANGLES

作　　者：王骑 李郁林 李志国 廖海黎[1,2] WANG Qi;LI Yu-lin;LI Zhi-guo;LIAO Hai-li(Department of Bridge Engineering,Southwest Jiaotong University,Sichuan,Chengdu 610031,China;Key Laboratory for Wind Engineering of Sichuan Province,Sichuan,Chengdu 610031,China)

机构地区：[1]西南交通大学桥梁系,四川成都610031 [2]风工程四川省重点实验室,四川成都610031

出　　处：《工程力学》2018年第10期10-16,共7页Engineering Mechanics

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB036301);国家自然科学基金项目(51678508;51378442;51308478);国家自然科学基金高铁联合基金项目(U1434205)

摘　　要：薄平板在不同风攻角下的颤振导数鲜有研究。该文以宽厚比40的薄平板为研究对象,首先采用强迫振动风洞试验测试技术,在0°、3°、5°和7°攻角条件下对其颤振导数进行了测试。结果表明,0°攻角下薄平板模型和理想平板的4个关键颤振导数保持一致。颤振导数A_2~*在0°、3°和5°下为负值,且随着攻角增加绝对值减小,在7°攻角下当折算风速小于15时,A_2~*虽然仍为负值但接近于0,当折算风速大于15时转为正值并迅速增大;其他颤振导数在0°、3°和5°下的改变不如A_2~*显著,但在7°攻角下有显著变化。分别采用耦合颤振计算和自由振动风洞试验获得了薄平板模型在不同攻角下的颤振临界风速,两者误差小于4.5%,验证了颤振导数的准确性。研究成果也为大跨度桥梁考虑风攻角影响的颤振计算提供了参数。Flutter derivatives of a thin plate under different attack angles are scarcely studied.The flutter derivatives of a thin plate model with a side ratio of 40 are tested under 0,3,5 and 7 by forced vibration test in a wind tunnel.The results show that the four key flutter derivatives of the model are consistent with the ones of an ideal plate.The flutter derivatives A^*2 are negative under 0,3,5,and the absolute values decrease with the increasing attack angles.They are positive and increase rapidly under 7 wind attack angle when the reduced wind speed is greater than 15.The changes of other flutter derivatives are not obviously under 0,3 and 5,but are significant under 7 attack angle.The critical flutter speeds are obtained by calculations using flutter derivatives and tested by free vibration wind tunnel tests.The errors between the two results were less than 4.5%,which proved the validity of the flutter derivatives.The research achievements also offer parameters for flutter calculation of long span bridges with the consideration of attack angles.

关 键 词：薄平板 风攻角 颤振导数 强迫振动 风洞试验 

分 类 号：TU312.1[建筑科学—结构工程]