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Passenger car-induced lateral aerodynamic loads on cyclists during overtaking
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2020-12-22 , DOI: 10.1016/j.jweia.2020.104489
Christof Gromke , Bodo Ruck

Lateral loads on cyclist dummies exerted by an overtaking station wagon were acquired in a field measurement campaign. The cyclists were represented by full-size person dummies of an adult and a child on various bike types. Overtaking maneuvers with different vehicle speeds (40–100 ​km/h) and overtaking distances (0.5–2.0 ​m) were performed. Overall, the load time series reveal distinct phases with the lateral load acting to push a cyclist away in a pressure phase, followed by the lateral load acting to pull a cyclist towards the vehicle in a suction phase. The two phases are demarcated by a short transition period in which the load quickly flips over from a pressure peak to a suction peak. The peak-to-peak magnitude (flip over load) was found to increase with increasing cyclist lateral area, vehicle speed, and decreasing overtaking distance. The duration of the transition period (flip over duration) was found to decrease with increasing vehicle speed and decreasing overtaking distance. For the flip over load and duration, functional relationships based on the three aforementioned variables/parameters could be derived. Furthermore, the flip over load rate (ratio of flip over load and duration) is introduced and suggested as an informative measure for cyclist safety.



中文翻译:

超车过程中乘用车引起的侧向空气动力学负荷

在田野测量运动中,超车车辆对骑行者假人施加了侧向载荷。骑自行车的人以各种自行车类型的成人和儿童的全尺寸假人为代表。进行了不同车速(40-100 km / h)和超车距离(0.5-2.0 m)的超车操作。总的来说,负载时间序列显示出不同的阶段,其中侧向负载用于在压力阶段将骑车人推开,然后是侧向负载,用于在吸气阶段将骑车人拉向车辆。这两个阶段之间的过渡期很短,在此期间,负载迅速从压力峰值转换为吸力峰值。人们发现,随着骑自行车者的侧向面积,车速和超车距离的减小,峰峰值幅度(翻转负荷)也会增加。发现过渡期的持续时间(翻转持续时间)随着车速的增加和超车距离的减少而减小。对于翻转负​​荷和持续时间,可以得出基于上述三个变量/参数的功能关系。此外,介绍了翻车负荷率(翻车负荷与持续时间之比),并作为骑自行车者安全性的有益措施。

更新日期:2020-12-23
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