基于CPM法的安全气囊仿真及应用研究

发布时间：2018-05-21 20:47

本文选题：CPM法 + 安全气囊　；参考：《上海交通大学》2014年硕士论文

【摘要】：安全气囊是影响汽车安全性能的重要部件之一，其作为整车被动安全中约束系统的辅助配置，旨在事故发生时，缓解乘员与车内构件发生的二次碰撞冲击，有效地弥补了安全带约束乘员的局限性，保护乘员头部等处。本文基于CPM(Corpuscular Method)法理论进行了折叠安全气囊展开仿真及应用研究。首先，通过压力容器试验及折叠气囊静态离位摆锤试验等安全气囊基础试验的仿真，在验证气体发生器质量流及温度曲线准确性的基础上，开展折叠气囊静态展开对OOP(Out-of-Position)乘员胸部位置影响的研究，揭示了CPM法模拟气囊展开过程的可靠性。其次，基于CPM法与UP(Uniform Pressure)法模拟折叠气囊静态展开试验，对比结果表明CPM法能有效模拟气囊内高速气体流动。在此基础上结合Maxwell-Boltzmann速度分布律进行了CPM法设定不同粒子数的探讨：在热平衡条件下，粒子数越多，其速度分布曲线扰动减弱平滑趋近Maxwell-Boltzmann理论曲线，，说明CPM法可简化等效研究气体分子行为、模拟气囊展开初期高速气流流动，是替代UP法真实有效地模拟气囊膨胀过程的数值分析方法，对研究气囊与乘员尤其是OOP乘员的相互作用具有重要意义。最后，通过CPM法模拟正碰情况下乘员约束系统中的折叠气囊展开，并与实车正碰试验结果对比得出CPM法模拟能较准确地反映实际情况的结论。结合验证后的基本模型详细分析了约束系统对乘员的作用过程及安全带和安全气囊对乘员的保护效果。
[Abstract]:Airbag is one of the important components that affect the safety performance of the vehicle. As an auxiliary configuration of the restraint system in the passive safety of the whole vehicle, the purpose of the airbag is to alleviate the impact of the secondary collision between the occupant and the internal member of the vehicle when the accident occurs. It can effectively compensate for the limitation of seatbelt restraint and protect the occupant's head and so on. This paper studies the simulation and application of folding airbag based on CPM(Corpuscular method theory. Firstly, the simulation of airbag foundation test, such as pressure vessel test and folding airbag static detach pendulum test, is carried out to verify the accuracy of mass flow and temperature curve of gas generator. The effect of static deployment of folding airbag on the chest position of the occupants of OOPO Out-of-Positionwas studied, and the reliability of CPM method in simulating the process of balloon unwrapping was revealed. Secondly, the static expansion test of folding airbag is simulated based on CPM method and UP(Uniform pressure method. The results show that CPM method can effectively simulate the high velocity gas flow in the airbag. On the basis of this, the CPM method is combined with the Maxwell-Boltzmann velocity distribution law to study the different number of particles. Under the condition of thermal equilibrium, the more the number of particles, the more the velocity distribution curve is, the disturbance of the velocity distribution curve weakens and the smooth approach to the Maxwell-Boltzmann theoretical curve. The results show that CPM method can simplify the equivalent study of gas molecular behavior and simulate the high velocity airflow in the initial stage of airbag development. It is a numerical analysis method instead of up method to simulate the expansion process of airbag in real and effective way. It is of great significance to study the interaction between airbags and occupants, especially OOP occupants. Finally, the folding airbag expansion in the occupant restraint system is simulated by the CPM method, and compared with the results of the real vehicle positive impact test, the conclusion that the CPM simulation can accurately reflect the actual situation is obtained. Combined with the verified model, the effect of the restraint system on the occupant and the protective effect of the seat belt and the airbag on the occupant are analyzed in detail.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U491.61

【参考文献】