【摘要】 以B型地铁车车体为研究对象，考虑其满载状态下的运行条件，建立车体-轨道耦合动力学模型，获得轨道谱激励下车体四个空簧位置处的加速度-时间历程曲线，通过快速傅立叶变换(FFT)将其转换为加速度功率谱密度曲线(PSD),作为后续疲劳分析的输入载荷谱。根据EN 1999-1-3:2023中规定的焊接接头形式定义不同的S-N曲线，通过扫频分析得到整车的应力传递函数(FRF),最后结合Dirlik模型和Miner损伤理论对车体进行随机振动疲劳评估。结果表明，在垂向振动载荷作用下，B型地铁车车体疲劳强度满足设计要求。更多还原

【Abstract】 Aiming at the B-type subway car body while considering its operating conditions under full load conditions, the Vehicle-track coupling dynamics model is established to obtain the acceleration-time curves at the four air suspension positions of the car body under the excitation of the rail spectra, which are converted into the acceleration power spectral density curves(PSD) by Fast Fourier Transform(FFT) as the input load spectra of subsequent fatigue analyses. Subsequently, different S-N curves were defined according to the welded joint forms specified in EN 1999-1-3:2023, and the stress transfer function(FRF) of the entire vehicle was obtained through frequency sweep analysis. Finally, the random vibration fatigue assessment of the vehicle body was carried out by combining the Dirlik model and Miner damage theory. The results show that the fatigue strength of the B-type subway car body meets the design requirements under vertical vibration load.更多还原