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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。
In order to develop a new type of flexible guardrail end that can meet the new regulations of our country, according to the newly introduced evaluation standards in our country, the method of combining automobile-guardrail finite element model analysis with actual vehicle full- Topology Optimization of Automata to Undertake Topology Optimization Analysis of a New Type of Flexible Fence End Structures under Collision Conditions of Passenger Cars. Topological optimization of crashworthiness method was used to analyze the topological optimization of the new flexible guardrail design in five different conditions and the topological configuration of the new flexible guardrail was obtained. Finally, “Four arcs ” tip topology configuration simulation verification analysis. The analysis results show that the tip topological configuration with a mass fraction ratio of convergence configuration to original configuration of 0.3 can effectively prevent the existing flexible barrier head from stumbling and excessively accelerating occupants due to high strength and overturning accidents The maximum accelerations of X, Y and Z axes of the vehicle body are respectively 11.0,0.38 and 4.0g, which are less than 20g of the assessment standard, meeting the requirements of crash safety standards and providing sufficient binding force for the road guardrail to ensure that the guardrail of the road guardrail Normal protection ability.