B型地铁车辆转向架构架载荷特征研究

Load Characteristics of B-type Metro Vehicle Bogie Frame

[目的]我国地铁车辆在设计和校核中所采用的国际标准不完全符合车辆实际运营条件,导致一些地铁车辆转向架构架在未达到规定的运营里程时就出现了疲劳裂纹现象,开展实际运营条件下地铁车辆转向架构架载荷研究十分必要。[方法]基于B型地铁车辆长期跟踪测试试验实测数据,采用统计计算与STFT(短时傅里叶变换)分析相结合的方法,从线路状况、车辆运行状态和载客量3个方面研究构架载荷变化规律。[结果及结论]构架主体载荷和线路条件高度相关,构架局部载荷和车辆运行状态高度相关;减振器载荷和载客量之间有较为明显的负线性相关性,除侧滚载荷外的其他构架载荷与载客量呈正线性相关。

[Objective]The international standards adopted in metro vehicle design and verification in China do not fully align with the actual vehicle operating conditions,resulting in the phenomenon of fatigue cracks in some metro vehicle bogie frames before reaching the specified service mileage.It is therefore necessary to study the load characteristics of metro vehicle bogie frames under actual operating conditions.[Method]Based on long-term tracking test data of B-type metro vehicles,a combination of statistical calculation and STFT(short-time Fourier transform)analysis is used to study the variation law of bogie frame loads from three aspects of line condition,vehicle operation state and passenger load.[Result&Conclusion]The main load of the bogie frame is highly correlated with line conditions,while local load of the frame are closely related to the vehicle operation state.There is a significant negative linear correlation between damper load and passenger load,while other bogie frame loads,except for lateral rolling loads,show a positive linear correlation with passenger load.