Comparative multibody dynamics analysis of falls from playground climbing frames
Comparative multibody dynamics analysis of falls from playground climbing frames
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DOI：
10.1016/j.forsciint.2009.06.007
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发表时间：
2009-10-30
影响因子：
2.2
通讯作者：
Gilchrist, M. D.
中科院分区：
文献类型：
--
作者：
Rueda, M. A. Forero;Gilchrist, M. D.
本文介绍了多体动力学在评价儿童从操场攀爬架上福尔斯跌落后头部和下肢损伤相关参数变化中的应用。一个特定的下降情况下，被用来作为一个出发点，分析表面特性的影响，身体的姿势在影响，中间碰撞对攀登框架之前，影响地面。模拟使用6岁的行人MADYMO刚体模型和缩放的头部接触特性。能量吸收表面被证明可以将伤害严重度参数降低到刚性表面的30-80%，这取决于撞击姿势和表面。坠落过程中与攀爬架部件的碰撞可能会使头部与地面最终撞击的伤害严重程度增加90%以上。当使用不同的表面材料时，可以忽略的变化与下肢受伤风险有关。计算机重建的实际福尔斯，旨在量化身体伤害的严重程度依赖于准确的知识，初始条件之前，失败，中间运动学的下降和方向的身体时，它对地面的影响。多体建模被证明是一个有价值的工具，分析目击者信息的质量和分析相关的伤害风险与组件的变化影响从操场攀登框架坠落受伤。这种模拟还可以通过评估导致已知伤害的福尔斯的运动学运动序列的替代假设来支持法医调查。(C)2009爱思唯尔爱尔兰有限公司保留所有权利。
This paper shows the utility of multibody dynamics in evaluating changes in injury related parameters of the head and lower limbs of children following falls from playground climbing frames. A particular fall case was used as a starting point to analyze the influence of surface properties, posture of the body at impact, and intermediate collisions against the climbing frame before impacting the ground. Simulations were made using the 6-year-old pedestrian MADYMO rigid body model and scaled head contact characteristics. Energy absorbing surfaces were shown to reduce injury severity parameters by up to 30-80% of those of rigid surfaces, depending on impact posture and surface. Collisions against components of a climbing frame during a fall can increase injury severity of the final impact of the head with the ground by more than 90%. Negligible changes are associated with lower limb injury risks when different surfacing materials are used. Computer reconstructions of actual falls that are intended to quantify the severity of physical injuries rely on accurate knowledge of initial conditions prior to failing, intermediate kinematics of the fall and the orientation of the body when it impacts against the ground. Multibody modelling proved to be a valuable tool to analyze the quality of eyewitness information and analyze the relative injury risk associated with changes in components influencing fall injuries from playground climbing frames. Such simulations can also support forensic investigations by evaluating alternative hypotheses for the sequence of kinematic motion of falls which result in known injuries. (C) 2009 Elsevier Ireland Ltd. All rights reserved.