【作者】 丁如芳；

【导师】 林逸；

【作者基本信息】 吉林大学 ， 车辆工程， 2005， 硕士

【摘要】 随着正面碰撞乘员保护的设计规则CMVDR294 的实施,国内汽车正面安全性得到了很大的提高。2002 年全国汽车标准化委员会将汽车侧面碰撞安全性列入国标制定计划,并于2005 年4 月确定了《车辆侧面碰撞的乘员保护(送审稿)》的内容,已有车型及新开发的车型都必须考虑满足侧面碰撞法规,所以展开汽车侧面碰撞安全性的研究是十分必要的。本文建立了基于多刚体理论的某国产轿车侧面碰撞乘员约束系统仿真模型,按照欧洲侧面碰撞法规ECER95 的要求进行了乘员约束系统动态仿真研究。依据实车侧面碰撞试验结果,验证了乘员约束系统仿真模型的有效性。论文讨论了座椅系统在侧面碰撞中的作用,引入统计学中相关系数的概念来分析约束系统参数与乘员伤害值的关系,并用试验设计的方法给出了参数优化值。作为探讨,本文在原车约束系统模型上,匹配了侧面胸腹部保护气囊,并进行了整车约束系统保护性能的仿真计算。本文提出了一种基于计算机仿真的汽车侧面碰撞乘员约束系统参数分析的方法,并进行了大量的仿真计算,分析了某国产轿车侧面碰撞乘员约束系统参数,提高了该车约束系统性能,对其他同类型车的侧面碰撞乘员约束系统参数分析有较好的借鉴作用。更多还原

【Abstract】 1. Preface Today the automobile industry has been developed more and more, especially with the development of the highway, people has realized that it is impossible to avoid traffic accident entirely, because of the driver himself, the road conditions, the weather, the vehicle technique condition and so on. It is meaningful how to keep occupant form injury when impact happened, and to reduce the damage which arose by the accident, and also to improve the safety of vehicle. Nowadays safety has been become one of the three develop aspect of the modern vehicle technique. It has been replaced of quality and price gradually, and becoming the first factor in the vehicle market competition The main road in our country is grade crossing road, so it is more possible to happen side impact. According to the data, front impact happened 128.52 thousand times in 2002, accounted for 20.83 percent. Side impact happened 212.292 thousand times, accounted for 34.4 percent. So it is meaningful to develop the research work of side impact in our country. The study of occupant restraint system is one of the main contents in the research field of vehicle passive safety. The study content of occupant restraint system contains the development of side airbag, safety seat and optimization of door trim and pillar. Now the computer simulation is the most universal study method, this method can not only reduce the number of full test, save cost, but also used in concept design phase and shorten the development cycle. This paper is based on the project of “the parameter optimization of occupant restraint system in side impact”According to the analysis of the original occupant restraint system, the optimization idea has been put forward. 2. Main content of this paper 2.1The Creation and Validation of Occupant Restraint System Model in Side Impact This paper creates a vehicle side impact occupant restraint system model using MADYMO3D, The software which is based on Multi-body theory can effectively simulate the impact process and the injury of occupant. The model consists of four parts, the car module, the MDB module, the seat module and dummy module. Car and MDB module base on the real structures. Euro-SIDE-1 dummy come from the dummy family of Madymo’s .Before crash simulation, dummy adjusted pose in the field of gravity. The simulation carried out accord with the ECER95. The correlation between simulation and full test is regarded as efficient if the error is about 15 percent. Based on the results of full test, the validation of the deformation, the deceleration and the biomechanical response of dummy is done. The correlation shows that the model created is effective, and the modification can be processed on the basis of this model. 2.2Parameter Analysis and Optimization of Occupant Restraint System According to the great deformation of the seat in the full test, we studied the function of the seat in side impact, and draw a conclusion that the seat system was not the sensitive system in side impact. So it didn’t need to improve the design of the seat, and just keeping its own design parameters is ok. The paper applied the stochastic design space method, and introduced the correlation coefficient in statistics to study the relationship between restraint system parameter and occupant injury value. We knew that the relationship between system parameter and occupant injury value was not simply linear. If we want to improve the performance of restraint system, we must take account of the whole system. Based on this result, we analyzed the relationship between the whole system performance and parameter, and put forward the best value of every parameter. 2.3 Matching Side Airbag in Thorax and Abdomen Area The paper introduced the type and the development status of side airbag. Based on computer simulation design, the paper designed the side airbag model mainly protecting thorax and abdomen, and matched the airbag to the original restraint system, then made the airbag tally with the performance of restraint更多还原