Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains
The normalized operation of 30,000-ton heavy-haul trains is of significant importance for enhancing the transportation capacity of heavy-haul railways. However, with the increase in train formation size, traditional braking strategies result in excessive longitudinal impulse when combined pneumatic...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Actuators |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-0825/14/1/40 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832589452618235904 |
|---|---|
| author | Mingtao Zhang Congjin Shi Kun Wang Pengfei Liu Guoyun Liu Zhiwei Wang Weihua Zhang |
| author_facet | Mingtao Zhang Congjin Shi Kun Wang Pengfei Liu Guoyun Liu Zhiwei Wang Weihua Zhang |
| author_sort | Mingtao Zhang |
| collection | DOAJ |
| description | The normalized operation of 30,000-ton heavy-haul trains is of significant importance for enhancing the transportation capacity of heavy-haul railways. However, with the increase in train formation size, traditional braking strategies result in excessive longitudinal impulse when combined pneumatic and electric braking is applied on long, steep gradients. This presents a serious challenge to the braking safety of the train. To this end, this paper establishes a longitudinal dynamic model of a 30,000-ton heavy-haul train based on vehicle system dynamics theory, and validates the model’s effectiveness through line test data. On this basis, the influence of two braking parameters, namely, the distribution of the magnitude of the electric braking force and the matching time of pneumatic braking and electric braking, on the longitudinal dynamic behavior of heavy-haul trains is studied. Thereby, an optimized combined pneumatic and electric braking strategy is formulated to reduce the longitudinal impulse of the trains. The results show that setting reasonable braking parameters can effectively reduce the longitudinal impulse, with the braking matching time having a significant impact on the longitudinal impulse. Specifically, when using a strategy where the electric braking forces of three locomotives are set to 90 kN, 300 kN, and 300 kN, with a 30 s delay in applying the electric braking force, a better optimization effect is achieved. The two proposed braking strategies reduce the maximum longitudinal forces by 20.27% and 47.83%, respectively, compared to conventional approaches. The research results provide effective methods and theoretical guidance for optimizing the braking strategy and ensuring the operational safety of 30,000-ton heavy-haul trains. |
| format | Article |
| id | doaj-art-15ad8976fead46feac26b88c45d7ae6a |
| institution | Kabale University |
| issn | 2076-0825 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Actuators |
| spelling | doaj-art-15ad8976fead46feac26b88c45d7ae6a2025-01-24T13:15:16ZengMDPI AGActuators2076-08252025-01-011414010.3390/act14010040Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul TrainsMingtao Zhang0Congjin Shi1Kun Wang2Pengfei Liu3Guoyun Liu4Zhiwei Wang5Weihua Zhang6State Key Laboratory of Heavy-Duty and Express High-Power Electric Locomotive, CRRC Zhuzhou Locomotive Co., Ltd., Zhuzhou 412001, ChinaChina Construction Industrial & Energy Engineering Group Co., Ltd., Nanjing 210046, ChinaChina Construction Industrial & Energy Engineering Group Co., Ltd., Nanjing 210046, ChinaState Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaState Key Laboratory of Heavy-Duty and Express High-Power Electric Locomotive, CRRC Zhuzhou Locomotive Co., Ltd., Zhuzhou 412001, ChinaState Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, ChinaState Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, ChinaThe normalized operation of 30,000-ton heavy-haul trains is of significant importance for enhancing the transportation capacity of heavy-haul railways. However, with the increase in train formation size, traditional braking strategies result in excessive longitudinal impulse when combined pneumatic and electric braking is applied on long, steep gradients. This presents a serious challenge to the braking safety of the train. To this end, this paper establishes a longitudinal dynamic model of a 30,000-ton heavy-haul train based on vehicle system dynamics theory, and validates the model’s effectiveness through line test data. On this basis, the influence of two braking parameters, namely, the distribution of the magnitude of the electric braking force and the matching time of pneumatic braking and electric braking, on the longitudinal dynamic behavior of heavy-haul trains is studied. Thereby, an optimized combined pneumatic and electric braking strategy is formulated to reduce the longitudinal impulse of the trains. The results show that setting reasonable braking parameters can effectively reduce the longitudinal impulse, with the braking matching time having a significant impact on the longitudinal impulse. Specifically, when using a strategy where the electric braking forces of three locomotives are set to 90 kN, 300 kN, and 300 kN, with a 30 s delay in applying the electric braking force, a better optimization effect is achieved. The two proposed braking strategies reduce the maximum longitudinal forces by 20.27% and 47.83%, respectively, compared to conventional approaches. The research results provide effective methods and theoretical guidance for optimizing the braking strategy and ensuring the operational safety of 30,000-ton heavy-haul trains.https://www.mdpi.com/2076-0825/14/1/40heavy-haul trainslongitudinal dynamicscombined brakingoptimization of braking strategycoupler force |
| spellingShingle | Mingtao Zhang Congjin Shi Kun Wang Pengfei Liu Guoyun Liu Zhiwei Wang Weihua Zhang Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains Actuators heavy-haul trains longitudinal dynamics combined braking optimization of braking strategy coupler force |
| title | Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains |
| title_full | Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains |
| title_fullStr | Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains |
| title_full_unstemmed | Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains |
| title_short | Optimization Study of Pneumatic–Electric Combined Braking Strategy for 30,000-ton Heavy-Haul Trains |
| title_sort | optimization study of pneumatic electric combined braking strategy for 30 000 ton heavy haul trains |
| topic | heavy-haul trains longitudinal dynamics combined braking optimization of braking strategy coupler force |
| url | https://www.mdpi.com/2076-0825/14/1/40 |
| work_keys_str_mv | AT mingtaozhang optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT congjinshi optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT kunwang optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT pengfeiliu optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT guoyunliu optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT zhiweiwang optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains AT weihuazhang optimizationstudyofpneumaticelectriccombinedbrakingstrategyfor30000tonheavyhaultrains |