In order to reduce both the weight of vehicles and the damage of occupants in a crash event simultaneously, it is necessary to perform a multi-objective optimal design of the automotive energy absorbing components. Mo...In order to reduce both the weight of vehicles and the damage of occupants in a crash event simultaneously, it is necessary to perform a multi-objective optimal design of the automotive energy absorbing components. Modified non-dominated sorting genetic algorithm II(NSGA II) was used for multi-objective optimization of automotive S-rail considering absorbed energy(E), peak crushing force(Fmax) and mass of the structure(W) as three conflicting objective functions. In the multi-objective optimization problem(MOP), E and Fmax are defined by polynomial models extracted using the software GEvo M based on train and test data obtained from numerical simulation of quasi-static crushing of the S-rail using ABAQUS. Finally, the nearest to ideal point(NIP)method and technique for ordering preferences by similarity to ideal solution(TOPSIS) method are used to find the some trade-off optimum design points from all non-dominated optimum design points represented by the Pareto fronts. Results represent that the optimum design point obtained from TOPSIS method exhibits better trade-off in comparison with that of optimum design point obtained from NIP method.展开更多
研制了一种新型板式无砟轨道TKT-S(Tie Ke Track-Slab),轨道板采用工厂预制普通混凝土结构;板下为纵向条状聚氨酯支撑层,通过调整聚氨酯层的相关力学指标达到减振目的。在大量分析计算和试验的基础上,确定各部件的构造尺寸与聚氨酯的相...研制了一种新型板式无砟轨道TKT-S(Tie Ke Track-Slab),轨道板采用工厂预制普通混凝土结构;板下为纵向条状聚氨酯支撑层,通过调整聚氨酯层的相关力学指标达到减振目的。在大量分析计算和试验的基础上,确定各部件的构造尺寸与聚氨酯的相关配方等。对减振型和非减振型轨道分别进行了自振频率、模态和谐响应分析,以掌握轨道动力性能。为检验轨道系统的减振性能,在室内分别建立了减振和非减振轨道的实尺模型,开展落锤冲击试验;在中国国家铁道试验中心建立50 m试验段,进行行车试验;同时,对落锤冲击和行车试验进行了仿真计算。计算与试验结果吻合,表明TKT-S具有良好的减振性能。展开更多
文摘In order to reduce both the weight of vehicles and the damage of occupants in a crash event simultaneously, it is necessary to perform a multi-objective optimal design of the automotive energy absorbing components. Modified non-dominated sorting genetic algorithm II(NSGA II) was used for multi-objective optimization of automotive S-rail considering absorbed energy(E), peak crushing force(Fmax) and mass of the structure(W) as three conflicting objective functions. In the multi-objective optimization problem(MOP), E and Fmax are defined by polynomial models extracted using the software GEvo M based on train and test data obtained from numerical simulation of quasi-static crushing of the S-rail using ABAQUS. Finally, the nearest to ideal point(NIP)method and technique for ordering preferences by similarity to ideal solution(TOPSIS) method are used to find the some trade-off optimum design points from all non-dominated optimum design points represented by the Pareto fronts. Results represent that the optimum design point obtained from TOPSIS method exhibits better trade-off in comparison with that of optimum design point obtained from NIP method.
文摘研制了一种新型板式无砟轨道TKT-S(Tie Ke Track-Slab),轨道板采用工厂预制普通混凝土结构;板下为纵向条状聚氨酯支撑层,通过调整聚氨酯层的相关力学指标达到减振目的。在大量分析计算和试验的基础上,确定各部件的构造尺寸与聚氨酯的相关配方等。对减振型和非减振型轨道分别进行了自振频率、模态和谐响应分析,以掌握轨道动力性能。为检验轨道系统的减振性能,在室内分别建立了减振和非减振轨道的实尺模型,开展落锤冲击试验;在中国国家铁道试验中心建立50 m试验段,进行行车试验;同时,对落锤冲击和行车试验进行了仿真计算。计算与试验结果吻合,表明TKT-S具有良好的减振性能。
