地铁车辆车体纵向载荷及疲劳损伤特征研究

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中图分类号：U270.32 文献标志码：B doi：10.20213/j.cnki.tdcl.2025.01.009

Abstract：To study the longitudinal load spectrum of the metro trains running on main lines，a quasi-static calibration is performed on the traction connecting rod and the coupler of a metro car in operation and the longitudinal load main line test is carried out on the car carrying passengers to obtain the load-time history curve in conditions including starting，braking，straight line and curve.The fluctuation center method is used to get the load spectrum of all theconditions；based on the finite element model and combining with the measured load spectrum and the linear cumulative damage theory，the impact of different conditions and different passenger capacities on the fatigue damage of the key welds of the carbody as wellas the proportion of interstation damage are analyzed. The study results show：the linear correlation between longitudinal loads of carbody is always above O.8；during starting and braking，the longitudinal load satisfies a certain proportional relationship and has an increment of 1～3kN in peak periods; the damage generated under the large-amplitude load in this stage accounts for more than 90% of the total interstation damage，and the regenerative braking reduces the proportion of damage of the braking stage by 8% compared with the starting stage.

Key words： metro car; linear correlation; longitudinal load spectrum; FEA; fatigue damage characteristics

随着轨道交通技术的发展，轨道交通在城市中的运用越来越多元化。（剩余12730字）