Optimization Study of Driver Knee Airbag Design for Front Impact of Coach
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摘要: 在大客车前碰撞中,由于前围产生较大侵入变形,极易造成驾驶员下肢损伤。为减少驾驶员下肢损伤风险,设计了一种驾驶员膝部安全气囊,并采用计算机仿真方法对气囊进行了优化分析研究。首先,利用Hypermesh建立12 m大客车的有限元模型,并对其进行正面碰撞模拟,验证了客车模型的可行性,且得到驾驶员座椅下方加速度曲线。然后,用MADYMO动力学软件建立了该大客车驾驶员约束系统的前碰撞模型,模型包含客车驾驶舱、驾驶员座椅、三点式安全带、转向系统、和膝部安全气囊。进而将有限元客车整车正面碰撞模拟获得的加速度曲线作为MADYMO碰撞模型的输入载荷条件,分析了安全带和膝部气囊的八个设计参数对驾驶员下肢损伤的影响。最后得到膝部气囊点火时刻、膝部气囊拉带长度、膝部气囊排气孔面积系数三个主效应影响因子,并基于多目标遗传算法对其进行优化分析,优化结果使驾驶员下肢损伤风险得到了很大程度的降低。Abstract: In front impact of coach, lower extremities of driver are often injured because of the large intrusion deformation of front wall. To reduce the injury risk of driver's lower extremities, a type of driver knee airbag was designed and optimized with computer simulations. A finite element model of a 12 meter long coach was developed with Ls-dyna software. The simulation of the front impact of the coach model was carried out and the feasibility of the coach model was analyzed. Furthermore, the acceleration of the coach was acquired at the bottom of driver seat, then the front impact model for driver restraint system was established via MADYMO dynamic code. This model includes coach driver compartment, driver seat, three-point safety belt, steering system and knee airbag. The simulated acceleration curve of coach front impact was used as the input load condition in MADYMO model of the coach driver restraint system. The influence of eight design parameters of belt and knee airbag on the injuries of driver's lower extremities was analyzed. The results show that there are three key influence factors, including initiation moment of knee airbag, the strap length of knee airbag and the area coefficient for the exhaust openings of knee airbag. Based on multi-objective genetic algorithms, the optimization for the knee airbag was conducted according to these three factors. The injury risk of driver's lower extremities is greatly reduced after optimization.
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Key words:
- acceleration /
- automobile drivers /
- automobile steering equipment
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[1] 徐炯.面向乘员损伤的大客车碰撞事故再现研究与应用[D].上海:上海交通大学,2012 Xu J. Research and application of motor-bus collision accident reconstruction oriented to occupant injury [D]. Shanghai: Shanghai Jiaotong University, 2012 (in Chinese) [2] Olivares G, Yadav V. Injury mechanisms to mass transit bus passengers during frontal, side and rear impact crash scenarios[C]//Proceedings of the 21st (ESV) International Technical Conference on the Enhanced Safety of Vehicles, June 2009, Stuttgart, Germany. Stuttgart, Germany: National Highway Traffic Safety Administration, 2009 [3] Dong L P, Zhu X C, Ma Z X. Research on computer simulation of knee airbag [C]//Proceedings of the International Conference on Information Engineering and Applications (IEA) 2012, London: Springer, 2013,2:353-362 [4] Roychoudhury R S, Conlee J K, Best M, et al. Blow-molded plastic active knee bolsters[R]. SAE Technical Paper 2004-01-0844, 2004 [5] Borde P. Pyrotechnic knee bolster development and its contribution to car drivers safety [R]. SAE Technical Paper 2001-01-1049, 2001 [6] Hong S, Jung H, Cho B R, et al. A study on invisible knee airbag cushion folding design using DOE (design of experimental) method [J]. Hyundai MOBIS, 2007,8(3):12-19 [7] Jenkins J, Ridella S, Ham S. Development of an inflatable knee bolster by using MADYMO and DOE[C]//Proceedings of the 9th International MADYMO User's Conference, 2002 [8] Ashline T, Bock H. Investigating the effects of anchor pretensioners, knee bolster airbags and seat belt changes in an IRL tub [R]. SAE Technical Paper 2004-01-3563, 2004 [9] Saul R A. NHTSA's Motorcoach safety research crash, sled, and static tests [R]. DOT HS 811 335. National Highway Traffic Safety Administration, US Department of Transportation. 2007 [10] 胡陈晨.轿车正面碰撞驾驶员头、胸和下肢损伤研究[D].长沙:湖南大学, 2011 Hu C C. Research on driver head, chest and lower extremity injuries in the car frontal impact [D]. Changsha: Hunan University, 2011 (in Chinese) [11] Mayrhofer E, Steffan H, Hoschopf H. Enhanced coach and bus occupant safety[C]//Proceedings of the 19th International Technical Conference on the Enhanced Safety of Vehicles, Washington, DC: National Highway Traffic Safety Administration, 2005 [12] 钟志华,杨济匡.汽车安全气囊技术及其应用[J].中国机械工程,200011(1):234-237 Zhong Z H, Yang J K. Automotive airbag technology and its application[J]. China Mechanical Engineering, 2000,11(1):234-237 (in Chinese) [13] 王治家."二维平面网格技术"在PAB开发过程中的应用[C]//第二届大中华区用户大会,上海, 2006 Wang Z J. Two-dimensional plane grid technology application in PAB development process[C]//The Second User Conference in Great China, Shanghai, 2006 (in Chinese) [14] 杨杏梅,杨济匡,任立海.基于儿童与成人损伤防护的侧面气囊参数优化[J].中国机械工程,2011,22(14):1748-1753 Yang X M, Yang J K, Ren L H. Optimization of design parameters of side airbags for protection of child and adult occupants [J]. China Mechanical Engineering, 2011,22(14):1748-1753 (in Chinese) [15] 赖宇阳.Isight 参数优化理论与实例详解[M].北京:北京航空航天大学出版社,2012 Lai Y Y. Parameter optimization theory and example explanation [M]. Beijing: Beihang University Press, 2012 (in Chinese)
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