Aeroelastic response of an inclined circular cylinder in smooth and turbulent flow
Aeroelastic response of an inclined circular cylinder in smooth and turbulent flow
复制标题
倾斜圆柱体在平滑流和湍流中的气动弹性响应
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Y. Kubo
中科院分区：
文献类型：
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作者：
K. Kimura;Kusuo Kato;Y. Kubo
摘要：为了研究斜拉桥拉索的大振幅风振响应特性，在光滑流场和网格化湍流场中进行了一系列的风洞试验。测试在高达约50 m/s的速度下进行，使用倾斜角度为30°、40°和45°的圆柱模型。模型的Sc比原型略小。观察到振幅大于2D的大响应。在湍流度较大的情况下，响应的负气动阻尼较弱，但在结构阻尼对数衰减率为0.027-0.034（λ = 30°，Iu = 4.6% λ）的情况下，仍观察到较大的无量纲响应λ/D，约为1.3。对于雷诺数为30°的情况，不同湍流强度下的起振风速顺序与临界雷诺数顺序相对应。然而，对于其他两种情况，顺序相反。因此，强烈反应的原因仍需研究清楚。在有限的情况下，模型的质量或固有频率的影响也进行了研究。
ABSTRACT: In order to clarify the characteristics of large amplitude wind-induced response of cables in cable-stayed bridges, a series of wind tunnel tests was conducted in smooth and gridgenerated turbulent flow. Tests were conducted at up to around 50 m/s, using circular cylinder models with inclined angle of 30°, 40° and 45°. Sc of the models was somewhat smaller than the prototype. Large responses with amplitude more than 2D were observed. The response in more turbulent flow had less intense negative aerodynamic damping, but large nondimensional response, /D, around 1.3 was still observed with structural damping in logarithmic decrement = 0.027-0.034 for = 30° and Iu = 4.6%case. For = 30° case, the order of onset wind speeds in different turbulence intensities seemed to correspond to that of the critical Re numbers. However, for the other two cases, the order was opposite. Therefore, the cause of the intense response still needs to be studied for clear understanding. In limited cases, effects of model mass or natural frequency were also studied.