Structural Strength Analysis Method of Urban Rail Transit Vehicle under Traction and Braking Conditions
［Objective］ Excessive traction and braking loads are significant factors contributing to inducing fatigue cracks in the welded joints of the ′TBB (traction beam-bolster beam-buffer beam) structure′ in urban rail transit vehicles. To effectively mitigate the risk of structural cracking, it is essenti...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Urban Mass Transit Magazine Press
2025-02-01
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| Series: | Chengshi guidao jiaotong yanjiu |
| Subjects: | |
| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.2025.02.015.html |
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| Summary: | ［Objective］ Excessive traction and braking loads are significant factors contributing to inducing fatigue cracks in the welded joints of the ′TBB (traction beam-bolster beam-buffer beam) structure′ in urban rail transit vehicles. To effectively mitigate the risk of structural cracking, it is essential to thoroughly investigate the methods for analyzing the structural strength of vehicles under traction and braking conditions during design phase. ［Method］ Taking a specific urban rail transit line in China as the research object, the line test data are analyzed to study the phase relationships of loads at stress points. The phase test results for traction and braking loads are examined. Based on the theoretical load distribution under traction and braking conditions, four finite element model constraint schemes are designed to analyze the strength of the TBB structure in different schemes. Simulated and experimental load values are compared. Three primary welds at the junctions of the TBB structure and the underframe are selected, and the fatigue assessment results of the 3 welds in 4 modeling schemes are analyzed. ［Result & Conclusion］ Under Scheme 1-3, the loads are applied as inertial loads, resulting in dissonance between load distribution proportion and direction at stress points under traction/breaking conditions, and those under train operating conditions. Scheme 4 (concentrated force loading form) can effectively reflect the phase relationship and magnitudes of the loads at the stress points. |
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| ISSN: | 1007-869X |