Mechanical Analysis and Structural Optimization of a Certain Type of Metro Bogie Frame

Abstract

Metro serves as a core pillar of urban public transportation. As a key operating component of metro vehicles, the bogie directly determines the safety and reliability of train operation. Existing studies on railway bogies have achieved fruitful results in terms of dynamic performance, fatigue life, and other aspects. But there is still a lack of targeted research on the structural optimization of metro bogie frames under complex operating conditions. In this paper, a refined finite element model of a specific type of metro bogie frame is established and static analysis is performed based on actual operating loads. The results indicate that the original model exhibits significant stress concentration at key parts such as the gearbox hanger, which poses potential safety risks. Targeted structural optimization schemes are proposed for these high-stress regions. Comparative analysis verifies that the optimized bogie frame reduces maximum stress by 46.1% and strain by 27.7%. The frame mass increases by only 7.78%. The schemes effectively reduce stress concentration and improve mechanical performance. This work provides an effective reference for metro bogie frame structural improvement and safety enhancement. It also supports the development of high-performance bogie design methods.