摘要
该文通过节段模型风洞试验,以7个不同截面参数的H型吊杆为对象,系统研究了翼板开孔和截面高宽比两参数分别对H型吊杆的颤振、驰振和涡振性能的影响。试验结果表明:高宽比H/B=0.417时,增大翼板开孔可明显提高H型吊杆弱轴向驰振临界风速,同时也会改善吊杆的涡振稳定性,但对扭转颤振和强轴向驰振性能无明显作用;增大高宽比可同时提高H型吊杆弱轴向和强轴向的驰振临界风速,也可显著的影响颤振和涡振特性。总的看来,增大高宽比较翼板开孔能更好的提升H型吊杆风振稳定性。
An in-depth investigation on the H-section hangers＇ aerodynamic performances in forms of flutter, galloping and vortex shedding has been conducted through a series of wind tunnel tests. A total of 7 H-section models with different flange perforation ratios and depth-to-width ratio are tested to investigate their effects on aerodynamic behaviors of hangers, respectively. It is found that the flange perforation may enhance the aerodynamic capability against galloping at a weak axis as well as the vortex resonance, but have no obvious effects on flutter instability and galloping instability for a strong axis, at least for the shallow H-section with H/B=0.417. Increasing the depth-to-width ratios notably improves the galloping performances in both weak axis and strong axis, and the aerodynamic performances in forms of flutter and vortex shedding could also be significantly influenced by the increase of depth-to-width ratios. The results indicate the increase of depth-to-width is better than the flange perforation in resisting wind-induced vibrations of H-section hangers.
出处
《工程力学》
EI
CSCD
北大核心
2013年第5期221-226,共6页
Engineering Mechanics
基金
国家自然科学基金项目(51208213)
华南理工大学中央高校基本科研业务费项目(2009ZM0110)
华南理工大学自然科学青年基金项目(E5090740)
湖南大学风工程与桥梁工程湖南省重点实验室开放基金项目
关键词
风洞试验
H型吊杆
风致振动
颤振
驰振
涡振
wind tunnel test
H-section hangers
wind-induced vibration
flutter
galloping
vortex-inducedvibration
