Impact of key airtight components on pressure comfort in metro train

LI Yang; LIU You-mei

doi:10.19818/j.cnki.1671-1637.2024.03.016

Volume 24 Issue 3

Jun. 2024

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Article Navigation > Journal of Traffic and Transportation Engineering > 2024 > 24(3): 227-237

LI Yang, LIU You-mei. Impact of key airtight components on pressure comfort in metro train[J]. Journal of Traffic and Transportation Engineering, 2024, 24(3): 227-237. doi: 10.19818/j.cnki.1671-1637.2024.03.016

Citation:

LI Yang, LIU You-mei. Impact of key airtight components on pressure comfort in metro train[J]. Journal of Traffic and Transportation Engineering, 2024, 24(3): 227-237. doi: 10.19818/j.cnki.1671-1637.2024.03.016

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Impact of key airtight components on pressure comfort in metro train

doi: 10.19818/j.cnki.1671-1637.2024.03.016

CRRC Zhuzhou Locomotive Co., Ltd., Zhuzhou 412001, Hunan, China

Funds:

National Major Technology and Equipment Tackling Project of China 2019430204

Science and Technology Innovation Program of Hunan Province 2021RC2107

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Author Bio:
LI Yang(1982-), male, senior engineer, PhD, liyangcsu12@163.com
Received Date: 2023-12-15
Available Online: 2024-07-18
Publish Date: 2024-06-30

Abstract

Abstract

To comprehensively analyze the impact of external pressure on passenger ear comfort during metro train operation, a real vehicle line test method was employed to measure the internal and external pressures of key airtight components (pressure wave protection valve for air conditioning, door pneumatic auxiliary lock, and gangway drainage hole screen) under different sealing conditions when the metro train passed through the tunnel at a constant speed. The fluctuating characteristics of external pressure, the pressure distribution law of the train in the longitudinal direction, as well as the influences of key airtight components on the pressure change amplitude inside the train were analyzed. Research results show that external pressures on the head vehicle and the middle vehicle are greatly affected by the compression wave generated while the train head enters the tunnel. The peak pressure on the train body surface gradually decreases from the head vehicle to the tail vehicle. When the air conditioning is on, compared with the situation when the pressure wave protection valve is enabled, the pressure change amplitude inside the train increases by 48%-61% within 3 s and 75%-90% within 1 s when the pressure wave protection valve is not enabled. This indicates that the pressure wave protection valve for air conditioning has a significant effect on the pressure comfort inside the train. When the air conditioning is off, compared with the situation when the door pneumatic auxiliary lock is enabled, the pressure change amplitude inside the train increases by 39%-46% within 3 s and by 69%-78% within 1 s when the door pneumatic auxiliary lock is not enabled. This indicates that the importance of the door pneumatic auxiliary lock's effect on the pressure comfort inside the train is second to the pressure wave protection valve for air conditioning. When the air conditioning is off, compared with the situation when the gangway drainage hole screen is enabled, the pressure change amplitude inside the train increases by 3%-11% within 3 s and 1%-13% within 1 s when the gangway drainage hole screen is not enabled. This indicates that the gangway drainage hole screen has a relatively small effect on the pressure inside the train.
- vehicle engineering,
- metro train,
- real vehicle test,
- pressure wave,
- airtightness,
- comfort

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References(30)

References

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Impact of key airtight components on pressure comfort in metro train

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