Fatigue Analysis of Urban Rail Transit Vehicles Bogies Based on Frequency Domain Features
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 8
Abstract
Objective As a key structure for carrying the vehicle, the abnormal vibration of bogies has a direct impact on the service performance of rail transit trains. Therefore, it is necessary to conduct in-depth research on the fatigue of vehicle bogies. Method In response to the abnormal bogie vibration on a certain urban rail transit train, a main line passenger tracking test is conducted to analyze the dynamic stress in the key areas for the testing vehicle. Combined with the elastic mode of bogie frame, the frame vibration and main frequency of wheel-rail excitation under different track types are compared and studied. Result & Conclusion The equivalent stress (σaeq) of 17 measuring points on train bogie frame exceeds the limit of 70 MPa before wheel reprofiling, while only one measuring point exceeds the limit after wheel reprofiling. Therefore, wheel off roundness has a significant impact on the dynamic stress of the frame. The main frequency of the frame dynamic stress signal both before and after wheel reprofiling is 59 Hz in the low-frequency range, and the main frequency energy still exists after wheel reprofiling, indicating that its correlation with train running speed and wheel off roundness is relatively small. The main frequency of dynamic stress signal is above 700 Hz in the high-frequency range. Since the high-frequency σaeq is mainly within 25 MPa, its contribution to the damage of bogie frame is very small. This type of bogie frame has an elastic mode with a frequency of about 59 Hz, where motor and side beam nod in the opposite direction. The frequency of this elastic mode is consistent with the main frequency of the dynamic stress signal of vehicle dynamic stress measurement points on three track types: long sleeper integrated track bed+ZX-2 fastener, short sleeper integrated track bed+ZX-2 fastener, and floating plate track bed (high-end steel)+ZX-2 fastener. However, this main frequency does not exist on other track types, indicating that the elastic mode of the frame is excited on some track types, causing excessive fatigue damage values. The vertical vibration main frequencies of the vehicle axle box on this line are 60.5 Hz and 37.0 Hz respectively, of which 60.5 Hz is mainly generated by the coupling effect between the vehicle and the track, and 37.0 Hz has a certain correlation with the vibration damping fasteners. Therefore, the combination of track bed and fastener types has a significant impact on the wheel rail vibration.
Authors and Affiliations
Dingxiang HU, Cheng ZHU, Xin JIN, Chen YANG, Jinsong ZHOU
Keywords
Related Articles
- EP ID EP742715
- DOI 10.16037/j.1007-869x.2024.08.044
- Views 9
- Downloads 0
Interchange Renovation Construction Technology of Beijing Subway Line 10 Xitucheng Station
Objective Taking the interchange renovation construction of Beijing Subway Line 10 Xitucheng Station as example, the construction scheme for interchange renovation in existing station without reserved transfer conditions...
TCMS-based Dual-bus Grid-connected Power Supply Control Technology Scheme for Metro Train Auxiliary Power Supply System
Objective In the current mainstream of train auxiliary power supply systems, such as cross-supply method and extended supply method, the failure of a single SIV (auxiliary inverter) can impact the normal operation of ele...
Type Selection and Unification of Urban Rail Transit Train Basic Braking Device
Objective Selection of basic braking device (abbreviated as BBD) may affect the braking performance, running performance and operating cost of urban rail transit trains. Targeting the characteristics of wide variety, dif...
Segmental Power Supply Scheme and Fault Identification Method for Urban Rail Transit Traction Network in Continuous Co-phase Power Supply Mode
Objective When urban rail transit line adopts the continuous co-phase power supply mode, a fault in the traction network may cause extended power outage due to the complexity and non-backup structure of the traction netw...
Analysis and Improvement of Pantograph Carbon Strip Abnormal Wear on Luoyang Metro Line 1
Objective During inspection, problems like the bad pantograph and catenary relation, pantograph-catenary arcing on the main line, burning points and serious wear on the pantograph carbon strip are detected since the tria...