摘要
为了解首次松开制动时刻(t1)扰动下基于制动控制的人地碰撞损伤防护方法的使用风险,基于一个包括3种速度、4种行人尺寸和2个行人步态的虚拟仿真系统,设计并用MADYMO开展1920次仿真。对比分析后发现:车辆制动控制方法在无参数扰动时能有效降低人地碰撞损伤且不增大车辆所致损伤;t1扰动下,WIC降低、车辆所致HIC15不变、地面所致HIC15降低、落地姿态不变的案例占比分别为86.1%、98.61%、90.16%和90.97%,表明车辆制动控制方法具有很强的抗扰能力;t1越早越可能增大车辆所致损伤,而t1越晚越可能降低头地碰撞损伤防护效果。进一步分析发现,t1扰动下人地碰撞损伤增加的主要原因有人车长时间不分离、人体从车体边缘掉落、落地姿态改变、完全制动组中伤害已经极低等;而保险杠长度、发动机罩盖倾斜角等参数显著影响制动控制方法的抗扰能力,其中保险杠长度越小、发动机罩盖倾斜角越大,制动控制方法的抗扰动能力越强。
In order to understand the application risk of the pedestrian ground collision injury protection method based on braking control under the disturbance of the first time for releasing the braking(t1),1920 simulation tests are designed and conducted by MADYMO based on a virtual simulation system with 3 velocities,4 pedestrian sizes and 2 pedestrian gaits.After comparison analysis,it is found that the pedestrian-ground collision injury can be effectively reduced without increasing the vehicle induced injury by employing the vehicle braking control method when there is no parameter disturbance.Under the disturbance of the first time for the vehicle to release its braking(t1),the proportion of cases in which the WIC is reduced,the vehicle related HIC15is not changed,the ground related HIC15is reduced and the pedestrian landing posture is not changed is 86.1%、98.61%、90.16%and90.97%respectively.This means that the vehicle braking control method has a strong anti-disturbance ability.The earlier of t1,the more likely it is to increase the vehicle induced injury;the later of t1,the more likely it is to reduce the protective effect of head ground collision injury.Further analysis shows that main reasons for the increase of the pedestrian-ground collision injury under t1disturbance are long time no leaving of the pedestrian from the vehicle,the pedestrian falling to the ground from the edge of the vehicle,change of the pedestrian landing posture and already extremely low injury in the complete braking group,etc.Parameters such as bumper length and hood inclination angle significantly affect the anti-disturbance ability of the vehicle braking control method.The smaller the bumper length and the larger the inclination angle of the hood,the stronger the anti-disturbance ability of the method.
作者
邹铁方
周靖
Zou Tiefang;Zhou Jing(School of Automotive and Mechanical Engineering,Changsha University of Science&Technology,Changsha 410114)
出处
《汽车工程》
EI
CSCD
北大核心
2023年第2期313-323,共11页
Automotive Engineering
基金
国家自然科学基金(51775056)
长沙市自然科学基金(kq2208225)
湖南省教育厅重点项目(22A0236)资助。
关键词
人地碰撞损伤
车辆制动控制
首次松开制动时间
扰动
风险
pedestrian-ground collision injury
vehicle braking control
the first time for releasing the braking
disturbance
risk