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Effects of the presence of the body in helmet oblique impacts

机译：头盔倾斜撞击中人体的影响

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摘要

The oblique impact methods of motorcycle helmet standards prescribe using an isolated headform. However, in accidents the presence of the body may influence impact responses of the head and helmet. In this study, the effects of the presence of the body, in helmet oblique impacts, are investigated. Using the Finite Element method, oblique impacts of a commercially available helmet, coupled with a model of the human body, are simulated. A comparison between full-body impacts and those performed with an isolated headform show that the presence of the body modifies the peak head rotational acceleration by up to 40%. In addition, it has a significant effect on head linear acceleration and the crushing distance of the helmet's liner. To include the effect of the body on head rotational acceleration in headform impacts, modifying inertial properties of the headform is proposed. The modified inertial properties are determined for a severe and frequent impact configuration. The results of helmet impacts obtained by using the modified headform are in very good agreement with those of full-body impacts; this verifies the accuracy of the proposed method.
机译：摩托车头盔标准件的倾斜撞击方法规定使用隔离的头盔。但是，在事故中，身体的存在可能会影响头部和头盔的撞击响应。在这项研究中，研究了头盔倾斜撞击时人体存在的影响。使用有限元方法，模拟了市售头盔的倾斜冲击以及人体模型。全身撞击与孤立头枕撞击之间的比较表明，人体的存在可将头部的峰值旋转加速度提高多达40％。此外，它对头部的线性加速度和头盔衬里的压紧距离也有重要影响。为了将主体对头部旋转加速度中头部旋转加速度的影响包括在内，提出了修改头部形状的惯性特性的建议。对于严重和频繁的冲击构型，将确定修改后的惯性属性。使用改进的头饰获得的头盔碰撞结果与全身碰撞结果非常吻合。这验证了所提出方法的准确性。

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