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首页> 外文期刊>International journal of crashworthiness >A study of the pedestrian impact kinematics using finite element dummy models: the corridors and dimensional analysis scaling of upper-body trajectories
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A study of the pedestrian impact kinematics using finite element dummy models: the corridors and dimensional analysis scaling of upper-body trajectories

机译：使用有限元虚拟模型的行人碰撞运动学研究：上身轨迹的走道和尺寸分析比例

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Pedestrian-vehicle impact experiments using cadavers have shown that factors such as vehicle shape and pedestrian anthropometry can influence pedestrian kinematics and injury mechanisms. Although a parametric study examining these factors could elucidate the complex relationships that govern pedestrian kinematics, it would be impractical with cadaver tests because of the relative expense involved in performing numerous experiments on subjects with varying anthropometry. On the other hand, finite element modelling represents a more feasible approach because numerous experiments can be conducted for a fraction of the expense. The current study examined the relationship between pedestrian anthropometry and front shape of a mid-size sedan using a PAM-CRASH model of the 50th-percentile male (50th M) Polar-II pedestrian dummy extensively validated against experimental data. To evaluate the influence of pedestrian anthropometry on response kinematics, scaled dummy models were developed on the basis of the weight and height of the 5th-percentile female (5th F), 50th-percentile female (50th F) and 95th-percentile male (95th M). Simulations of the 5th F, 50th F, 50th M, and 95th M Polar-II finite element models struck at 40 km/h by a mid-size sedan were used to generate trajectories of the head, upper thorax, mid-thorax and pelvis. In an effort to assess the validity of scaling techniques when interpreting trajectory data from vehicle-pedestrian crashes, the trajectories of the 5th F, 50th F and 95th M model were scaled to the 50th M and compared with those generated by the 50th M model. The results demonstrated non-linear behaviour of dummy kinematics that could not be accounted for with traditional dimensional analysis scaling techniques.
机译：使用尸体的行人车辆碰撞实验表明，车辆形状和行人人体测量学等因素会影响行人运动学和伤害机制。尽管检查这些因素的参数研究可以阐明支配行人运动学的复杂关系，但是对于尸体测试来说这是不切实际的，因为在涉及不同人体测量学的受试者上进行大量实验涉及相对费用。另一方面，有限元建模代表了一种更可行的方法，因为可以进行许多实验，而费用却很少。当前的研究使用第50个百分位男性（第50M）Polar-II行人假人的PAM-CRASH模型检查了行人人体测量学与中型轿车前部形状之间的关系，该模型已针对实验数据进行了广泛验证。为了评估行人人体测量学对反应运动学的影响，根据5％的女性（5th F），50％的女性（50th F）和95％的男性（95th）的体重和身高建立了比例模型M）。使用中型轿车以40 km / h的速度对5th F，50th F，50th M和95th M Polar-II有限元模型进行仿真，以生成头部，上胸部，中胸部和骨盆的轨迹。为了评估解释行人碰撞事故的轨迹数据时缩放技术的有效性，将第5 F，第50 F和第95 M模型的轨迹缩放为50 M，并与由50 M模型生成的轨迹进行比较。结果表明，虚拟运动学的非线性行为无法用传统的尺寸分析缩放技术解决。

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