Effects of oscillation amplitude on aerodynamic derivatives

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• 作者：Noda ; M. ; Utsunomiya ; H. ; Nagao ; F. ; Kanda ; M. ; Shiraishi ; N.
• 关键词：Aerodynamic derivatives ; Torsional flutter ; Effects of oscillating amplitude ; Experimental condition
• 刊名：Journal of Wind Engineering and Industrial Aerodynamics
• 出版年：2003
• 期刊代码：55_01676105
• 类别：ms
• 出版时间：January, 2003
• 卷：91
• 期：1-2
• 页码：101-111
• 文件大小：296 K

摘要

In this paper, the effects of oscillation amplitude on the aerodynamic derivatives of the thin rectangular cylinder with B/D=13 and 150 were investigated. It was clear that the torsional amplitude affected strongly the aerodynamic derivatives H₂^* and A₂^*. This effect reduced the critical velocity of flutter by about 10%. The cause of this effect was investigated by the measurement of the unsteady surface pressure. This investigation made it clear that the variation of A₂^* is caused by the movement of the acting point of the resultant lift force. These results indicate that these effects cannot be disregarded for such a simple thin plate but for a real bridge girder with a more complex cross-section and with delicate aerodynamic control devices.