现代制造工程Issue(11)：57-64,56,9.DOI:10.16731/j.cnki.1671-3133.2025.11.008
动车组车体强度可靠性安全系数分析
Analysis of safety coefficients for the strength and reliability of rolling stock bodies
摘要
Abstract
Based on reliability theory,the randomness of both the stress experienced by the electric multiple unit(EMU)carbody and the material strength is taken into account to analyze the safety factors in the structural design process of railway vehicles.A finite element model of an intermediate EMU carbody of a certain high-speed train type is established.According to EN12663-1,the static strength load cases of the carbody are determined,and the safety factors are analyzed.The three-dimensional,compres-sible,and unsteady Navier-Stokes equations are employed for numerical simulation.Under a crosswind condition with a wind speed of 20 m/s,the pressure wave generated when two EM Us pass each other at a speed of 300 km/h is used as the input source for aerodynamic loads.These aerodynamic loads are combined with vertical loads and dynamic loads during operation to form the fatigue strength load cases for the EMU carbody.Goodman fatigue limit diagrams under different reliability levels are plotted to evaluate the fatigue strength of the EMU carbody.The research results indicate that as reliability increases,the safety factors decrease,but the EMU carbody still complies with the static and fatigue strength standards under different reliability levels.At a reliability level of 99％,the minimum static strength reliability safety factor is 1.2,which occurs under a compres-sive load of 1 500 kN at the coupler centerline height and its combination with the maximum vertical static load.The maximum stress is located at the coupler yoke seat.When evaluating the impact of aerodynamic loads on structural fatigue during crosswind encounters,the safety factor at the corner of the sidewall windows is relatively low,with a minimum value of 1.36,meeting the design requirements.关键词
动车组车体/静强度/疲劳强度/气动载荷/可靠性安全系数Key words
Electric Multiple Unit(EMU)car body/static strength/fatigue strength/aerodynamic load/safety factor of reliability分类
交通工程引用本文复制引用
王绍隆,祁文哲,李德仓,范业龙,王武,尚明洁,吕思潭..动车组车体强度可靠性安全系数分析[J].现代制造工程,2025,(11):57-64,56,9.基金项目
国家自然科学基金项目(72061021) （72061021）
