安全气囊性能仿真及优化研究
发布时间：2018-12-31 11:59
【摘要】：社会的进步对当代汽车的安全、节能、环保提出了更高的要求,安全气囊系统作为汽车被动安全的重要组成部分在汽车碰撞安全中扮演着重要角色,在实际交通事故中挽救了无数的生命。在整车开发过程中,为实现整车安全系统最优,每个车型的气囊系统都要进行针对性的零部件试验及碰撞匹配验证试验,实际的物理零部件试验及碰撞匹配试验耗时久且试验成本高,采用CAE仿真分析的方法可有效实现气囊系统零部件及整车(滑车)碰撞性能的评价。目前针对气囊系统碰撞仿真技术主要有多刚体动力学技术及非线性有限元技术,多刚体动力学模型具有计算效率高,计算量小的优点,有限元模型相对多刚体模型计算量大但模型精度高。在整车正面碰撞中,主驾驶安全气囊主要用于保护乘员头部与胸部安全,膝部安全气囊主要保护乘员膝盖与腿部安全。本文以主驾驶安全气囊及膝部安全气囊为研究对象,主要研究论述了安全气囊性能仿真及优化方法,分以下几方面内容:⑴气袋织布拉伸试验的有限元仿真模型建立与标定;⑵安全气囊有限元仿真模型建立与标定,包括静态展开试验仿真模型建立标定及动态跌落试验仿真模型建立与标定;⑶驾驶室碰撞仿真模型的建立及动态标定;⑷安全气囊仿真优化与试验验证。研究结果表明:非线性各向异性织布材料模型建立的安全气囊精度最高,通过织布拉伸试验仿真能够使安全气囊模型展开更加准确;通过气囊静态展开试验仿真标定及跌落试验仿真标定,使气囊模型静态展开过程及排气特性与试验一致;通过车体建模及整车碰撞仿真可建立有效的约束系统碰撞仿真优化模型;基于试验设计可分析气囊各参数对碰撞结果的影响,通过仿真验证可有效完成膝部气囊及主驾驶气囊匹配优化;基于有限元及多体动力学的碰撞安全仿真分析技术对于气囊产品的匹配优化是有效的。
[Abstract]:The progress of the society has put forward higher requirements for the safety, energy saving and environmental protection of the contemporary automobile. As an important part of the passive safety of the automobile, the airbag system plays an important role in the automobile collision safety. Countless lives were saved in actual traffic accidents. In the process of vehicle development, in order to achieve the optimal safety system of the whole vehicle, the airbag system of each vehicle model must carry on the specific parts test and the collision match verification test. The actual physical parts test and collision matching test take a long time and high test cost. The CAE simulation analysis method can effectively realize the evaluation of the impact performance of air bag system parts and the whole vehicle (pulley). At present, there are many rigid body dynamics technology and nonlinear finite element technology for airbag system collision simulation technology. The multi-rigid body dynamics model has the advantages of high computational efficiency and less computational complexity. The finite element model is more complicated than the multi-rigid body model, but the precision of the model is high. The main driving airbag is mainly used to protect the head and chest of the occupant, and the knee airbag mainly protects the safety of the passenger's knee and leg. Taking the main driving airbag and the knee airbag as the research object, this paper mainly discusses the simulation and optimization methods of the airbag performance, which includes the following aspects: 1 Establishment and calibration of the finite element simulation model of the airbag fabric tensile test; (2) Establishment and calibration of airbag finite element simulation model, including static expansion test simulation model establishment and dynamic drop test simulation model establishment and calibration, 3 cab collision simulation model establishment and dynamic calibration; 4 airbag simulation optimization and test verification. The results show that the nonlinear anisotropic weaving material model has the highest airbag accuracy, and the airbag model can be expanded more accurately by the simulation of fabric tensile test. The static expansion process and exhaust characteristics of the airbag model are consistent with the test through the simulation calibration of the airbag static expansion test and the drop test. Through vehicle body modeling and vehicle collision simulation, an effective collision simulation optimization model of constrained system can be established. Based on the experimental design, the impact of the parameters of the airbag on the impact results can be analyzed, and the matching optimization of the knee airbag and the main driving airbag can be effectively completed by simulation. Collision safety simulation based on finite element and multi-body dynamics is effective for airbag product matching and optimization.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U491.61
本文编号：2396541
[Abstract]:The progress of the society has put forward higher requirements for the safety, energy saving and environmental protection of the contemporary automobile. As an important part of the passive safety of the automobile, the airbag system plays an important role in the automobile collision safety. Countless lives were saved in actual traffic accidents. In the process of vehicle development, in order to achieve the optimal safety system of the whole vehicle, the airbag system of each vehicle model must carry on the specific parts test and the collision match verification test. The actual physical parts test and collision matching test take a long time and high test cost. The CAE simulation analysis method can effectively realize the evaluation of the impact performance of air bag system parts and the whole vehicle (pulley). At present, there are many rigid body dynamics technology and nonlinear finite element technology for airbag system collision simulation technology. The multi-rigid body dynamics model has the advantages of high computational efficiency and less computational complexity. The finite element model is more complicated than the multi-rigid body model, but the precision of the model is high. The main driving airbag is mainly used to protect the head and chest of the occupant, and the knee airbag mainly protects the safety of the passenger's knee and leg. Taking the main driving airbag and the knee airbag as the research object, this paper mainly discusses the simulation and optimization methods of the airbag performance, which includes the following aspects: 1 Establishment and calibration of the finite element simulation model of the airbag fabric tensile test; (2) Establishment and calibration of airbag finite element simulation model, including static expansion test simulation model establishment and dynamic drop test simulation model establishment and calibration, 3 cab collision simulation model establishment and dynamic calibration; 4 airbag simulation optimization and test verification. The results show that the nonlinear anisotropic weaving material model has the highest airbag accuracy, and the airbag model can be expanded more accurately by the simulation of fabric tensile test. The static expansion process and exhaust characteristics of the airbag model are consistent with the test through the simulation calibration of the airbag static expansion test and the drop test. Through vehicle body modeling and vehicle collision simulation, an effective collision simulation optimization model of constrained system can be established. Based on the experimental design, the impact of the parameters of the airbag on the impact results can be analyzed, and the matching optimization of the knee airbag and the main driving airbag can be effectively completed by simulation. Collision safety simulation based on finite element and multi-body dynamics is effective for airbag product matching and optimization.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U491.61
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