Bubble burst is the excitation mechanism of rain wind induced vibrations of stay cables
We experimentally investigate the mechanism of rain-wind induced vibrations(RWIVs)of a flexible stay cable model in the wind tunnel tests.The RWIVs are successfully excited by guiding water rivulets on the cable surface.An ultrahigh-speed camera is employed to monitor and record the images of instantaneous upper rivulet and a particle image velocimetry(PIV)technique is used to characterize the flow structures around the flexible cable suffering from RWIVs.The instaneous movement of the upper rivulet during the first,second and third mode RWIVs are recorded with the ultrahigh-speed camera.By employing a computer vision based recognition technique,the upper rivulet dynamics of different modes of RWIVs are recognized and analyzed.The wake flow structures around the dry cable,the static cable with water rivulet running and the cable suffering from RWIVs are measured by using the particle image velocimetry(PIV)system.Based on the rivulet evolution and wake flow structures,bubble burst is proposed as a mechanism for the excitation of RWIVs.
Flexible cable rain-wind induced vibrations upper rivulet dynamics flow structures bubble burst
Donglai Gao Wenli Chen Yewei Huang Wenhan Yang Hui Li
School of Civil Engineering,Harbin Institute of Technology,Harbin,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
3164-3169
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）