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Internal pressure fluctuation modelling and passenger pressure comfort analysis of high-speed trains passing through extreme tunnels
https://orcid.org/0000-0002-3110-7316
https://orcid.org/0000-0002-4597-9115
Abstract As the high-speed train navigates extreme tunnels—characterised by high altitude, steep gradients, and an extended length—extreme tunnel pressure waves are introduced into the carriage, inducing internal pressure fluctuations that in turn impact passenger pressure comfort. To clarify the pressure fluctuation dynamics experienced by the train navigating extreme tunnels, this study initially employs one-dimensional (1D) numerical simulation to replicate extreme tunnel pressure waves. Subsequently, an internal pressure fluctuation model is formulated, accounting for the coupled effects of the oxygen supply system, airtight gaps, air ducts, and car body deformation. Based on this model, the analysis extends to investigating the diverse effects of distinct factors on internal pressure fluctuation. Employing the orthogonal experimental design methodology, it is established that the primary effect on internal pressure fluctuation is attributed to air ducts, followed by the oxygen supply system, airtight gaps, and finally, car body deformation. Lastly, the effect of pressure variation on passenger pressure comfort is analysed. Outcomes reveal that under the straight tunnel condition, the change rate of internal pressure in 10 s interval is 1025.2 Pa/10 s, exceeding 2.52 % of the standard, and the amplitude of internal pressure reaches 1.5 kPa, surpassing 50 % of the standard. However, under the extreme tunnel condition, the amplitude of internal pressure escalates to 10.9 kPa, substantially exceeding the passenger comfort standard.
Graphical abstract Display Omitted
Highlights Established the internal pressure model of trains traversing extreme tunnels. Obtained a sequence of transfer ways affecting the internal pressure fluctuation. Obtained the internal pressure fluctuation mechanism of trains traversing tunnels. Analysed the effect of internal pressure variation on passenger pressure comfort.
Internal pressure fluctuation modelling and passenger pressure comfort analysis of high-speed trains passing through extreme tunnels
https://orcid.org/0000-0002-3110-7316
https://orcid.org/0000-0002-4597-9115
Abstract As the high-speed train navigates extreme tunnels—characterised by high altitude, steep gradients, and an extended length—extreme tunnel pressure waves are introduced into the carriage, inducing internal pressure fluctuations that in turn impact passenger pressure comfort. To clarify the pressure fluctuation dynamics experienced by the train navigating extreme tunnels, this study initially employs one-dimensional (1D) numerical simulation to replicate extreme tunnel pressure waves. Subsequently, an internal pressure fluctuation model is formulated, accounting for the coupled effects of the oxygen supply system, airtight gaps, air ducts, and car body deformation. Based on this model, the analysis extends to investigating the diverse effects of distinct factors on internal pressure fluctuation. Employing the orthogonal experimental design methodology, it is established that the primary effect on internal pressure fluctuation is attributed to air ducts, followed by the oxygen supply system, airtight gaps, and finally, car body deformation. Lastly, the effect of pressure variation on passenger pressure comfort is analysed. Outcomes reveal that under the straight tunnel condition, the change rate of internal pressure in 10 s interval is 1025.2 Pa/10 s, exceeding 2.52 % of the standard, and the amplitude of internal pressure reaches 1.5 kPa, surpassing 50 % of the standard. However, under the extreme tunnel condition, the amplitude of internal pressure escalates to 10.9 kPa, substantially exceeding the passenger comfort standard.
Graphical abstract Display Omitted
Highlights Established the internal pressure model of trains traversing extreme tunnels. Obtained a sequence of transfer ways affecting the internal pressure fluctuation. Obtained the internal pressure fluctuation mechanism of trains traversing tunnels. Analysed the effect of internal pressure variation on passenger pressure comfort.
Internal pressure fluctuation modelling and passenger pressure comfort analysis of high-speed trains passing through extreme tunnels
https://orcid.org/0000-0002-3110-7316
https://orcid.org/0000-0002-4597-9115
Abstract As the high-speed train navigates extreme tunnels—characterised by high altitude, steep gradients, and an extended length—extreme tunnel pressure waves are introduced into the carriage, inducing internal pressure fluctuations that in turn impact passenger pressure comfort. To clarify the pressure fluctuation dynamics experienced by the train navigating extreme tunnels, this study initially employs one-dimensional (1D) numerical simulation to replicate extreme tunnel pressure waves. Subsequently, an internal pressure fluctuation model is formulated, accounting for the coupled effects of the oxygen supply system, airtight gaps, air ducts, and car body deformation. Based on this model, the analysis extends to investigating the diverse effects of distinct factors on internal pressure fluctuation. Employing the orthogonal experimental design methodology, it is established that the primary effect on internal pressure fluctuation is attributed to air ducts, followed by the oxygen supply system, airtight gaps, and finally, car body deformation. Lastly, the effect of pressure variation on passenger pressure comfort is analysed. Outcomes reveal that under the straight tunnel condition, the change rate of internal pressure in 10 s interval is 1025.2 Pa/10 s, exceeding 2.52 % of the standard, and the amplitude of internal pressure reaches 1.5 kPa, surpassing 50 % of the standard. However, under the extreme tunnel condition, the amplitude of internal pressure escalates to 10.9 kPa, substantially exceeding the passenger comfort standard.
Graphical abstract Display Omitted
Highlights Established the internal pressure model of trains traversing extreme tunnels. Obtained a sequence of transfer ways affecting the internal pressure fluctuation. Obtained the internal pressure fluctuation mechanism of trains traversing tunnels. Analysed the effect of internal pressure variation on passenger pressure comfort.
Internal pressure fluctuation modelling and passenger pressure comfort analysis of high-speed trains passing through extreme tunnels
Yang, Lu (author) / Chen, Chunjun (author) / Wang, Xiru (author) / Deng, Ji (author) / Zheng, Qin (author)
Building and Environment ; 251
2024-01-11
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2013
| British Library Online Contents | 1993