Multiobjective Optimization of Beam Structure for Bogie Frame Considering Fatigue-Life Extension

This paper addresses the multiobjective optimization of a brake end beam of a bogie frame with consideration of three elements: the stress, fatigue, and weight. A finite-element analysis (FEA) is performed to obtain the stress distribution of the component, and the stress-life method and fatigue notch factor are used for fatigue-life assessment based on the FEA results. Subsequently, the multiobjective optimization problem in the form of mathematical functions, which considers three objectives, is handled using the design of experiments, approximation technique, analysis of variance, multiobjective algorithm, and Pareto-optimal solution. Finally, the FEA is validated according to the optimal result to verify the accuracy of the optimization. The results of this study indicate that the proposed approach is very available and has potential for the optimal design of the components of the bogie frame and/or the bogie itself.