Study on secondary optimization of metro aluminum alloy car body based on stiffness contribution
QIU Xinyu
LI Yana
LIU Xingyu
Abstract：In the screening of optimization design regions for subway car body structures,the sensitivity method is often used;however,its operation process is complex and cumbersome,and it cannot be quickly applied to the design of car body structures.To address this issue,based on the stiffness contribution theory and on the premise that the accuracy of the finite element model was verified through experiments,the local stiffness and global stiffness of the aluminum alloy subway car body were combined to quickly determine the main optimization regions of the car body.A method integrating topology optimization and size optimization was adopted to conduct a secondary optimization design study on the car body structure.The structural performance of the optimized car body fully complied with the EN 12663 standard:the mass of the optimized car body was reduced by 5.34%,the 1st-order vertical bending frequency was increased by 16%,and other modal frequencies were also significantly improved.This optimization provides a technical reference for the optimization design of other subway car body structures.
Keywords：Subway car bodyStiffness contribution degreeTopology optimizationSize optimization
Publication Date：2025-11-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 128-134 )