摘要
为提高汽车碰撞安全性能,满足2021版C-NCAP的评价要求,首先,根据中国汽车技术研究中心2021版CNCAP管理规则,对新增的MPDB工况进行了解读。然后,基于某新开发SUV车型采用LS-DYNA软件进行了有限元仿真分析,发现车身加速度、加速度平台40g以上持续时间以及兼容性罚分未满足设计要求。随后,进一步对仿真结果的车身变形模式进行了分析,发现未满足设计要求的原因主要为纵梁异常折弯、前防撞梁刚度弱以及壁障与车身的有效接触面积不足。基于分析结果对车辆前端包括前防撞梁、吸能盒、前纵梁以及小腿防撞梁进行了结构优化,并将优化方法代入正面100%重叠刚性壁障碰撞工况进行校核。最后,从车身结构变形模式、车身加速度曲线、壁障兼容性罚分这3方面进行了仿真试验对标。结果表明:加速度峰值由45.9g降为41.7g,加速度平台40g以上持续时间由7.4 ms降为2.85 ms,兼容性罚分由3.9降为2.71,车身变形模式和壁障变形均匀性得到明显改善;综合评估该优化方案,车身结构耐撞性能满足2021版MPDB工况五星得分规划要求,优化方案对正面100%重叠刚性壁障碰撞工况影响很小且满足设计要求;仿真与试验结果的吻合度在84%以上,证明了仿真结果的准确性。在此研究的基础上基于MPDB工况的特点和要求提出了5项优化设计思路,为后续车型开发提供参考。
In order to improve vehicle collision safety performance and meet the evaluation requirements of 2021 C-NCAP,firstly according to the management rules of 2021 C-NCAP of China Automotive Technology and Research Center,the new MPDB condition is interpreted.Then,based on the finite element analysis of a newly developed SUV by LS-DYNA software,it is found that the body acceleration,the acceleration platform duration above 40g and the compatibility penalty do not meet the design requirements.Subsequently,the body deformation mode of the simulation result is further analyzed,it is found that the main reasons for not meeting the design requirements are abnormal bending of the longitudinal beam,weak stiffness of the front anti-collision beam and insufficient effective contact area between the barrier and the car body.Based on the analysis result,the structure of the front end of the vehicle including the front anti-collision beam,the energy absorption box,the front longitudinal beam and the crus anti-collision beam are optimized.Finally,the simulation tests are carried out from 3 aspects:body structure deformation mode,body acceleration curve and barrier compatibility penalty.The result shows that(1)the peak acceleration is reduced from 45.9g to 41.7g,the duration of acceleration platform above 40g is reduced from 7.4 ms to 2.85 ms,the compatibility penalty is reduced from 3.9 to 2.71,and the deformation mode of the body and the deformation uniformity of the barrier are improved obviously;(2)based on the comprehensive evaluation,the crashworthiness of the body structure meets the requirement of MPDB condition in 2021 five-star score planning,and the impact of the optimization scheme on the front 100%overlapping rigid barriers is small and meets the design requirements;(3)the agreement between the simulation and test result is more than 84%,which proves the accuracy of the simulation result.On the basis of the study,5 optimal design ideas are put forward based on the characteristics and requirements of MPDB,which can prov
作者
吴磊
杨玲玲
李奇奇
WU Lei;YANG Ling-ling;LI Qi-qi(Liuzhou Railway Vocational Technical College,Liuzhou Guangxi 545616,China;School of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha Hunan 410114,China)
出处
《公路交通科技》
CSCD
北大核心
2023年第10期192-200,共9页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(52005054)
广西高校中青年教师科研基础能力提升项目(2023KY1442,2022KY1416)。
