当行人与车辆发生碰撞时,车身最前端的部件将直接与行人下肢腿部发生接触,其设计是满足行人下肢保护要求的关键。然而针对传统要求的基于刚性腿型行人保护车辆前结构设计方法,在应对柔性腿型行人保护要求已呈现明显的局限性。为了提高保险杠结构的柔性腿型保护功能,结合试验设计技术、组合近似建模技术、多目标优化算法和可靠性分析方法,以行人腿部的伤害值最低为优化目标,对车辆前端结构参数进行可靠性优化设计并对优化结果进行试验验证。研究结果表明：优化后的车辆前端结构与原设计相比,行人柔性腿型保护功能得到明显提高,为车辆前端结构的设计与开发提供有效的参考。
吕晓江, 谷先广, 王国荣, 周大永, 刘卫国
. 基于组合近似模型的可靠性优化方法在行人柔性腿型碰撞中应用研究[J]. 机械工程学报, 2016
, 52(10)
: 142
-149
.
DOI: 10.3901/JME.2016.10.142
When the pedestrian and vehicle collision occurs, the vehicle front-end structure which has direct contact with the pedestrian lower leg, it is designed to meet the critical requirements of pedestrian lower leg protection. However, there are obvious limitations in dealing with the vehicle front-end structure design to meet the flexible pedestrian legform impactor (Flex-PLI) pedestrian protection according to the requirements of transport research laboratory pedestrian legform impactor (TRL-PLI). To improve the performance of TRL-PLI pedestrian protection, the research will adopt to combine with experimental design, the ensemble of metamodels, the multiobjective optimization algorithm and reliable analysis methods, with minimizing the injuries of lower leg as the objectives, and optimize vehicle front-end structure parameters. The optimization design result is validated by test. Compared with the original design, pedestrian leg protection performance is significantly improved, which provides a reference for the design and development of the vehicle front-end structure.
[1] The World Health Organization (WHO). Global status report on road safety 2013：Supporting a decade of action[R]. Geneva：Department of Violence and Injury Prevention and Disability,World Health Organization,2013.
[2] MALLORY A,FREDRIKSSON R,ROSEN E,et al. Pedestrian injuries by source：Serious and disabling injuries in US and European cases[J]. Annals of Advances in Automotive Medicine,2012,56：13-24.
[3] MATSUI Y. Possibility of installing a data acquisition system in a pedestrian headform impactor[J]. International Journal of Crashworthiness,2014,19(2)：115-125.
[4] 徐中明,刘世谦,张志飞,等. 面向行人综合保护的汽车前部结构参数优化[J]. 汽车工程,2011,33(6)：497-501.
XU Zhongming,LIU Shiqian,ZHANG Zhifei,et al. Parameters optimization of car’s front-end structure for comprehensive pedestrian protection[J]. Automotive Engineering,2011,33(6)：497-501.
[5] ZERPA L,QUEIPO N V,PINTOS S,et al. An optimization methodology of alkaline-surfactant-polymer flooding processes using field scale numerical simulation and multiple surrogates[J]. Journal of Petroleum Science and Engineering,2005,47：197-208.
[6] GOEL T,HAFTKA R T,SHYY W,et al. Ensemble of surrogates[J]. Struct. Multidiscip. Optim.,2007,33(3)：199-216.
[7] MATSUI Y. Safety assessment characteristics of pedestrian legform impactors in vehicle-front impact tests[J]. Accident Analysis and Prevention,2014,73：65-72.
[8] 吕铖玮,杨海燕,吕晓江,等. 行人保护柔性腿型碰撞的车辆前端结构优化设计[J]. 汽车安全与节能学报,2013,4(3)：266-272.
LÜ Chengwei,YANG Haiyan,LÜ Xiaojiang,et al. Optimization design of front-end structure for flexible legform of pedestrian protection in crash[J]. J. Automotive Safety and Energy,2013,4(3)：266-272.
[9] KINSKY T,FRIESEN F,BUENGER B. The flexible pedestrian legform impactor and its impact on vehicle design[C]//22th Int’l. Tech. Conf. Enha. Safe. Vehi. (ESV),Washington DC：National Highway Traffic Safety Administration,2011.
[10] 孙光永,李光耀,陈涛,等. 基于6σ的稳健优化设计在薄板冲压成形中的应用[J]. 机械工程学报,2008,44(11)：248-254.
SUN Guangyong,LI Guangyao,CHEN Tao,et al. Sheet metal forming based six sigma robust optimization design[J]. Chinese Journal of Mechanical Engineering,2008,44(11)：248-254.
[11] ACAR E,RAIS-ROHANI M. Ensemble of metamodels with optimized weight factors[J]. Struct. Multidiscip. Optim.,2009,37：279-294.
[12] Euro NCAP. Pedestrian protection assessment protocol [R]. Brussels：Euro NCAP,2014.
[13] GU X,LU J. Reliability-based robust assessment for multiobjective optimization design of improving occupant restraint system performance[J]. Computers in Industry,2014,65：1169-1180.
[14] GU X,SUN G,LI G,et al. Multiobjective optimization design for vehicle occupant restraint system under frontal impact[J]. Struct. Multidiscip. Optim.,2014,47(3)：465-477.
[15] JIANG Z,GU M. Optimization of a fender structure for the crashworthiness design[J]. Materials & Design,2010,31(3)：1085-1095.
[16] 于梦阁,张继业,张卫华. 横风下高速列车流线型头型多目标气动优化设计[J]. 机械工程学报,2014,50(24)：122-129.
YU Mengge,ZHANG Jiye,ZHANG Weihua. Multi-objective aerodynamic optimization design of the streamlined head of high-speed trains under crosswinds[J]. Journal of Mechanical Engineering,2014,50(24)：122-129.
[17] 董小闵,丁飞耀,管治,等. 面向高速的磁流变缓冲器多目标优化设计及性能研究[J]. 机械工程学报,2014,50(5)：127-134.
DONG Xiaomin,DING Feiyao,GUAN Zhi,et al. Multi-objective optimization and performance research of magneto-rheological absorber under high speed[J]. Journal of Mechanical Engineering,2014,50(5)：127-134.
[18] SUN G,LI G,STONE M,et al. A two-stage multi-fidelity optimization procedure for honeycomb-type cellular materials[J]. Computational Materials Science,2010,49：500-511.
