首页|面向特定车头的人地碰撞损伤防护极简方法

面向特定车头的人地碰撞损伤防护极简方法

Simplified Method for Pedestrian Ground Contact Injury Protection in Specific Vehicle Front-end Shapes

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针对原制动控制方法对监测设备要求极高的问题,提出了一种具有较强实践潜力的人地碰撞损伤防护方法的提取流程.先建立特定车头的多刚体模型,再选择车辆制动控制方法并穷举、寻优,最后回归获得人体头部首次撞击车体时刻t1与车辆再次完全制动时刻t2的关系,以此提出面向特定车头的人地碰撞损伤防护极简方法(SMPG).以小型行人友好型轿车为例,检验此方法的可行性,分析2 400次仿真结果后,获得适用于小型行人友好型轿车的人地碰撞损伤防护极简方法,再经48次仿真发现,所得方法能显著降低人地碰撞损伤且不会增加人车碰撞损伤,添加车速扰动后的480次仿真显示,所得方法仍能很好地防护人地碰撞损伤且未增加人车碰撞损伤,表明能根据所提流程获得防护人地碰撞损伤的极简方法且方法效果佳.进一步分析发现,落地机制及躯干角度的改变是制动控制能降低人地碰撞损伤的主要原因,且通过流程所得的极简方法中的制动系统协调时间已达最优,无需进一步优化.研究结果将为通过制动控制以防护人地碰撞损伤的相关研究提供支持,推动其实用化.
To address the extremely stringent requirements of the original braking control method for monitoring equipment,an extraction process for a pedestrian ground contact injury protection method is proposed with strong practical potential.First,a multi-rigid body model of a specific vehicle front-end shape was constructed.Subsequently,an appropriate controlled vehicle braking method was selected.Through exhaustive and optimization techniques,a regression relationship between the time of pedestrian head first contact the vehicle and the vehicle's re-full braking time was established.Finally,the simplified method for pedestrian ground contact injury protection(SMPG)tailored for specific vehicle front-end shapes was employed.The min pedestrian-friendly sedan car(Mcar)was used as a case study.SMPG for this Mcar was obtained from 2 400 simulations,and 48 additional simulations showed that SMPG significantly reduces the pedestrian ground contact injury without increasing vehicle injury.The effectiveness of SMPG under various service conditions was demonstrated through an additional 480 simulations.These findings confirm that the proposed extraction process enables the acquisition of SMPG for specific vehicle front-end shapes,which proves to be practically effective.Further investigations revealed that the modification in landing mechanisms and torso angles plays a vital role in reducing pedestrian ground contact through controlled vehicle braking.Additionally,it was found that the lag time obtained through the proposed contraction process in SMPG is optimal.This study supports the practical application of controlling vehicle braking to protect against pedestrian ground contact in-j urie s.

automobile engineeringpedestrian ground contact injurycontrolled vehicle brakingvehicle front end shapecomparative study of injury

邹铁方、曾冲、王丹琦、胡林

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长沙理工大学汽车与机械工程学院,湖南长沙 410114

汽车工程 人地碰撞损伤 车辆制动控制 车头形状 损伤对比研究

国家自然科学基金项目长沙市自然科学基金项目湖南省教育厅重点项目上海市科委科技行动计划标准项目

51775056kq220822522A023620DZ2205200

2024

10.19721/j.cnki.1001-7372.2024.01.020

中国公路学报
中国公路学会

中国公路学报

CSTPCD北大核心
影响因子：1.607
ISSN：1001-7372
年,卷(期)：2024.37(1)
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