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首页> 外文会议>International Automotive Body Congress vol.1; 20050920-21; Ann Arbor,MI(US) >Structure Design and CAE Simulation for Vehicle Pitch anc Drop
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Structure Design and CAE Simulation for Vehicle Pitch anc Drop

机译：汽车跌落的结构设计与CAE仿真

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摘要

CAE has been used routinely for structure design in vehicle crash development. The CAE simulations are capable of quantifying the effect of design countermeasure and driving the vehicle design up-front. As is well known, the goal of front crash structure design is to absorb crash energy at an appropriate load level so that the vehicle decelerations and intrusions can be managed. To meet new FMVSS208 requirement with unbelted occupant injury metrics, vehicle pitch and drop play an important role for occupant neck and head injury at frontal impact. The excessive vehicle header drop induces aggressive interaction between occupant head and sun visor which can cause head and neck injuries. For most vehicles, the vertical bending deformations of front rails can pull the vehicle body downward and cause vehicle pitch and drop at high-speed front crash events. Therefore, the challenges of front rails design are not only to manage crash energy but also to guide rail deformation for minimizing vehicle pitch and drop. In this paper, the finite element method is used to analyze rail deformation at full frontal impact. The root cause of vehicle pitch and drop and design countermeasures for resolving this issue are discussed. CAE predictions and the test results are also compared for CAE-driven front structure design change.
机译：CAE已常规用于车辆碰撞开发中的结构设计。 CAE仿真能够量化设计对策的影响并提前推动车辆设计。众所周知，前碰撞结构设计的目的是在适当的负载水平下吸收碰撞能量，以便可以控制车辆的减速和闯入。为了满足新的FMVSS208要求，并采用无约束带的乘员伤害指标，车辆的俯仰和跌落对于在正面撞击时乘员的颈部和头部伤害起着重要的作用。过多的车辆头部下降会引起乘员头部与遮阳板之间的激进相互作用，从而导致头部和颈部受伤。对于大多数车辆，前导轨的垂直弯曲变形会拉低车身，并在高速前撞事件时导致车辆俯仰和掉落。因此，前围栏设计的挑战不仅在于管理碰撞能量，而且还在于引导围栏变形以最小化车辆的俯仰和跌落。在本文中，有限元方法被用来分析全正面冲击下的钢轨变形。讨论了车辆上下颠簸的根本原因以及解决该问题的设计对策。还比较了CAE驱动的前部结构设计变更的CAE预测和测试结果。

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