THE OVERSHOOT OF AERODYNAMIC FORCES ON A RAILCAR-LIKE BODY UNDER STEP-FUNCTION-LIKE GUSTY WINDS
THE OVERSHOOT OF AERODYNAMIC FORCES ON A RAILCAR-LIKE BODY UNDER STEP-FUNCTION-LIKE GUSTY WINDS
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类似阶跃函数的阵风作用下类轨道车体上的空气动力的超调
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Hiromasa Kawashita
中科院分区：
文献类型：
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作者：
T. Takeuchi;Junji Maeda;Hiromasa Kawashita
在日本，轨道车辆经常被龙卷风等阵风掀翻，由于阵风在很短的时间内上升而产生的非定常空气动力受到了很多关注。对于抗风设计，风荷载基于准静态气动力。一般情况下，风系数C由定常或湍流风洞试验的经验数据提供。湍流强度最大为10%左右，属于准定常流动。虽然早期的研究(参考文献[1]-[5])指出在很短的时间内增加风速会增加风力，很少有研究集中在风速上升时间上。本文利用专用风洞和CFD方法，研究了阶跃函数型阵风上升时间对地面上箱形截面车体上风力的影响。
In Japan, railcar vehicles are often overturned by wind gusts, such as from tornadoes, and unsteady aerodynamic forces due to gusts rising in very short times have received a lot of attention. For wind resistant designs, the wind load is based on a quasi-static aerodynamic force. Generally, the coefficient of wind force, C, is supplied by empirical data from wind tunnel tests under a stationary or turbulent flow. The intensity of turbulence is, at most, about 10%, and the flow is classified as a quasi-steady flow. Although early studies (Ref. [1]-[5]) have pointed out that increasing wind velocity in a very short time increases wind force, there are few examinations focusing on the rise time of wind velocity. In this study the effects of the rise time of a step-function-like gust on wind forces on a 2-D body of a box-section like a railcar, which is on the ground, are investigated and discussed using a specially equipped wind tunnel and a CFD approach.
1999年强台风Brt袭击日本列岛的气压型式分析及梯度风与地面观测风的比较
DOI：
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发表时间：
2002
期刊：
J. Wind Eng. Ind., Aero 90
影响因子：
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作者：
Fujii;T.;J.Maeda;N.Ishida;T.Hayashi
通讯作者：
T.Hayashi