新型柔性护栏端头结构的拓扑优化

为了研发出一种能够满足我国新法规的新型柔性护栏端头,根据国内新出台的评价标准,利用汽车-护栏有限元模型仿真分析和实车足尺碰撞试验相结合的方法,并结合元胞自动机的拓扑优化方法,展开对客车碰撞条件下的新型柔性护栏端头结构拓扑优化分析。利用耐撞性拓扑优化方法,对新型柔性护栏端头设计区域进行5种不同工况下的拓扑优化分析,并得出新型柔性护栏端头结构拓扑构型;最后,利用仿真软件针对所提取的"四角弧度"端头拓扑构型进行仿真验证分析。分析结果表明:收敛构型与原构型的质量分数比为0.3的端头拓扑构型能够有效避免现有柔性护栏端头由于强度过高以致车体发生绊阻和乘员加速度过大以及翻车事故的发生,车体X、Y、Z轴的最大加速度分别为11.0、0.38、4.0g,均小于评定标准的20g,满足碰撞安全性标准要求,可为公路护栏提供足够约束力,保证公路护栏的正常防护能力。

Topology optimization of new flexible structure guardrail ends

According to develop a new flexible guardrail terminal which can meet the new regulations in our country, topology optimization of the end head of a novel flexible guard rail under the condition of bus collision was analyzed by adopting the method that combines the analysis of model simulation of the finite element of the car-barrier,full scale crash test of real vehicle with topology optimization of cellular automaton, which was based on the new evaluation criteria both at home and abroad. Under five different condition,topology optimization of flexible guard rail end head design area was analyzed. Moreover, a new topological configuration of flexible guard rail was obtained. Finally, the simulation software was used to simulate and verify the topology of the end head of the four corner arc. The analysis results indicated that:the end head topology of 0.3 mass fraction was able to avoid the occurrence the trip of car body, too high acceleration and rollover accident which was caused by the too high strength of the end head of the flexible guard rail. The maximum acceleration of the car body X, Y, Z axis were respectively 11.0, 0.38, 4.0g, which were all less than evaluation standard acceleration-20g. It meets the safety requirements of the collision. Therefore, it can ensure the normal protection ability of highway guard rails because it can provide enough binding force for highway fences.