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为减小SUV车型在人车碰撞中对行人小腿的伤害,文章对SUV车型前保险杠造型进行了优化。分析了上支撑与下支撑布置和材料对小腿碰撞伤害值的影响,结果表明,当前保险杠上支撑安装位置处于小腿上部质心以下时,上支撑与小腿上部质心距离及上支撑材料对胫骨加速度值影响较大,上支撑与下支撑距离与下支撑材料对剪切位移影响较大。采用优化后的前保险杠防撞系统有效地控制了行人小腿伤害值,有利于该车型行人保护性能的提升,为以后SUV车型行人保护前保险杠防撞系统设计提供一些参考。 相似文献
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Y. H. Lee Y. J. Joo J. S. Park Y. S. Kim H. J. Yim 《International Journal of Automotive Technology》2014,15(5):757-764
The Flexible Pedestrian Legform Impactor (Flex-PLI) consisting of a flexible femur and tibia will be tested for pedestrian protection by Euro NCAP within the next couple of years as a potential replacement for the Transport Research Laboratory (TRL) legform impactor. The injury risks that are measured when using Flex-PLI are the elongation of the anterior/posterior cruciate ligament (A/PCL), elongation of the medial collateral ligament (MCL), and tibia bending moment (TBM). In this study, we used a correlated computer-aided engineering (CAE) model to conduct a contribution analysis of each injury with regard to the changes in the location of the frontal structures based on the results of a design of experiments (DOE) and analysis of variance (ANOVA). The frontal structures that were selected as control factors were the energy absorber (EA), lower bumper stiffener (LBS), and hood angle. A kriging interpolation model was developed using the DOE results, and its results were compared with those of the CAE model. Furthermore, for robust design optimization, the speed and height of Flex-PLI were used as the noise factors. Finally, a robust design optimization was carried out using the optimal combination of the discrete control factors for minimizing MCL elongation. 相似文献
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Bumper optimum design using the dynamically equivalent beam under various impact conditions 总被引:1,自引:0,他引:1
D. K. Park 《International Journal of Automotive Technology》2014,15(6):937-943
Nowadays it is required for the bumper system to meet the various impact conditions simultaneously; barrier impact, IIHS (Insurance Institute for Highway Safety) bumper impact and pedestrian impact. Firstly, dynamically equivalent bumper beam models were developed for each impact condition and its accuracy was verified by nonlinear finite element analysis result. Dynamically equivalent pedestrian impact beam model was developed by using the equivalent forces of bumper beam and stiffeners. Pedestrian bending angle was obtained by using this equivalent pedestrian beam model. By combining these equivalent beam models, bumper optimum design program was developed. In this optimum design program, direct search method was used for the optimization algorithm. To verify the accuracy of this optimum design program, a nonlinear finite element result was used. By using this optimum design program, it can be secured the bumper impact performances in an early design stage and it will be also contributed to reduce the design time and test costs. 相似文献
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D. K. Park C. D. Jang S. B. Lee S. J. Heo H. J. Yim M. S. Kim 《International Journal of Automotive Technology》2010,11(4):489-494
This paper presents a design technique to optimize the shape of a vehicle bumper beam that satisfies both the safety requirements
for a front rigid-wall impact and the regulations protecting pedestrians from lower leg injuries caused by bumper impacts.
An intermediate response surface modeling (IRSM) technique was introduced to approximate the non-linear force-displacement
curves obtained from the front impact analysis of a vehicle bumper. The accuracy of the IRSM model was tested by comparing
its results with those of the non-linear finite element analysis. The maximum displacement error between the two models did
not exceed 3%. Using pedestrian impact analyses based on the experimental arrangement of the Plackett-Burman design, the approximate
functions describing the response values acting on the lower legs were calculated. The shape of the bumper beam was optimized
by integrating the IRSM with the force-displacement model and the approximate functions on lower leg impact. The optimization
results satisfied safety regulations on the maximum allowable displacement of the vehicle bumper, and also the regulations
protecting pedestrians from lower leg injuries caused by bumper impacts. 相似文献
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序列二次规划法在行人小腿保护的保险杠系统优化中的应用 总被引:2,自引:0,他引:2
建立汽车保险杠系统的多体模型,确定了影响行人腿部伤害的保险杠系统主要设计参数。建立相应的有限元模型,并采用LS-DYNA软件进行仿真分析。根据正交试验法得到的数据拟合出胫骨加速度、膝盖弯曲角度和剪切位移3个行人小腿伤害指标的目标函数,然后利用序列二次规划法依次对它们进行优化,最后得到了一组最优参数的保险杠系统设计,满足了法规要求,降低了行人腿部伤害值。 相似文献
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行人保护项目是世界范围内的一个安全课题,已越来越多地受到人们的关注。下腿碰撞是行人保护评价的重要内容之一,而下腿碰撞器模块直接影响评价结果。文章介绍了当前世界上的3种下腿碰撞器模块,分析了各自的结构特点和应用,总结了3种下腿碰撞器模块对车辆行人保护评价的差异性,对我国刚刚起步的车辆行人保护项目的研究和开展提供了一定的借鉴。 相似文献
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Taekyong Jeong Sang Beom Lee Hong Jae Yim 《International Journal of Automotive Technology》2017,18(5):813-822
In this study, shape optimization was conducted for a vehicle’s rear suspension torsion beam to improve its dynamic handling performance. To determine the design variables affecting the vehicle roll characteristics, a sensitivity analysis was conducted using the result of a Taguchi experiment with 6 factors in 8 runs. The upper and lower-flange lengths and web thickness of the torsion beam section, as well as the vertical height difference between the inner and outer of torsion beams, were determined as design variables through sensitivity analysis of the opposite wheel travel test for optimization of the torsion beam axle. The Box–Behnken experimental design with 4 factors and 27 runs was performed using the selected design variables and by performing opposite wheel travel analysis according to the experimental design, and the response surface functions of the roll stiffness, roll steer coefficient, roll center height, and mass of the torsion beam were generated. Using these response functions, shape optimization was conducted for the torsion beam of the rear suspension system. Dynamic performance analysis was performed by applying the optimized H-shaped torsion beam to the rear suspension of the vehicle dynamics model, and it was validated that the dynamic response performance of the optimized vehicle was improved. 相似文献
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Annually, thousands of unprotected pedestrians are killed or suffer serious injuries in accidents with moving vehicles. Numerous
automobile organizations have performed research on pedestrian safety. The European Enhanced Vehicle- Safety Committee (EEVC),
Working Group 17 (WG17) proposed three component subsystem tests to evaluate the friendliness of a vehicle to pedestrians:
the legform to hood test, the upper legform to bonnet leading edge test and the headform to bonnet top test. In assessing
the pedestrian friendliness of a vehicle, the present study adopted the WG17 regulations of the three component subsystem
tests. We herein describe in detail a finite element subsystem model built to analyze the pedestrian friendliness of a vehicle
using LS-DYNA. The first objective of this study was to simulate these three component subsystem impact tests and evaluate
car front aggressiveness. The second objective was to analyze the frontal structures of a vehicle and, based on the simulation
results, identify dangerous areas and provide suggestions for vehicle front design that may decrease pedestrian injuries.
The analysis of these models and the results obtained may be used to help evaluate the pedestrian friendliness of a vehicle
and guide the future development of pedestrian-friendly vehicle technologies. 相似文献
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行人头部碰撞保护一直是汽车行人安全设计的难点,随着E—NCAP对行人保护要求的不断提高,头部保护的得分比重对于获得高星级评价至关重要。文章基于某车型E—NCAPV6.2五星性能开发,采用虚拟仿真与试验测试有效结合的方法,对发动机罩进行了优化设计,提出了一种有利于行人头部碰撞保护的发动机罩。改进前后测试成绩的对比分析表明,该结构可极大优化行人头部碰撞保护效果,使发动机罩头部测试区域得分总分提升至24.43分,满足E—NCAPV6.2五星行人保护性能要求。可为后续设计提供参考,具有很高的推广价值。 相似文献
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碳纤维增强复合材料(CFRP)具有轻质高强的特点,本文中基于抗撞性要求将某乘用车保险杠原钢制防撞梁替换为CFRP,并进行铺层优化设计。首先对CFRP层合板进行力学性能试验以获得材料参数,并通过三点弯曲仿真试验验证其准确性,然后根据等刚度设计原理,确定CFRP防撞梁的厚度,并通过保险杠低速碰撞有限元仿真对比分析两种材料防撞梁的抗撞性能。在此基础上,以质量、比吸能、最大侵入量和碰撞力峰值为目标,采用熵权TOPSIS方法对CFRP防撞梁进行铺层优化,确定出最优铺层方案。结果表明,在保证抗撞性能要求的条件下,优化后的CFRP防撞梁比原钢制防撞梁减轻了76.82%。 相似文献
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行驶跑偏是指车辆在行驶过程中偏离了原来直线驾驶的状态,不仅会影响车辆的操纵稳定性和转向性能,更可能会危及乘客的人身安全。某SUV车型从设计到生产导入阶段,进行小批量投产时,出现大量车辆向左行驶跑偏现象,合格率约为60%。经过鱼骨图排查法的人、机、料、法、环等几个方面分析,列举出15种可能造成车辆行驶跑偏的因素。经过逐一排查,发现该SUV车型存在前副车架的控制臂安装支架尺寸超差,白车身的前、后副车架安装点尺寸控制不合理,前后悬模块装配一致性差及测试道路不规范等主要问题,以上四种问题造成的偏差趋势与实际该SUV车辆向左行驶跑偏现象相符,因此需要对以上问题进行优化及改进。文章是在这个背景下,针对该SUV车型的向左行驶跑偏现象,通过对问题零部件进行交叉试验,三坐标尺寸测量以及生产线生产过程一致性的逐一排查,逐一分析了四种问题发生的根本原因,并由此提出了优化改进方案,通过对比方案实施前后的实测数据,验证优化改进方案是否可行。优化后实测行驶跑偏量,符合企业行驶跑偏判定标准,行驶跑偏现象消失并保证了该SUV车型的正式量产时间。 相似文献