Rapid calculation of the compression wave generated by a train entering a tunnel with a vented hood: Short hoods

Howe, M. S.; Winslow, A.; Iida, Michihisa; Fukuda, Takashi

doi:10.1016/j.jsv.2007.09.012

Cited by 19 publications

(4 citation statements)

References 5 publications

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“…However, findings of their research are bounded by the research background where values of train speed in data analysis are mostly around 200 km/h. Through theoretical analysis and scaled model tests, Howe et al [4][5][6][7] systematically discussed the optimization of vented hoods by designing three type of tunnel hoods. Alleviation of aerodynamic effect was evaluated through plotting the peak pressure and pressure gradient versus train speed.…”

Section: Introductionmentioning

confidence: 99%

Field Test and Numerical Investigation of Tunnel Aerodynamic Effect Induced by High-Speed Trains Running at Higher Speeds

Wang,

Ma,

Han

et al. 2023

Applied Sciences

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After decades of research in the field of high-speed railway technique, technology of running high-speed trains at the velocity level of 350 km/h gradually become mature. It is of great importance to capture the variation regular of aerodynamic parameters in the situation that the high-speed train runs at a higher speed level. The present paper is motivated by this knowledge gap, both field tests and numerical simulations were conducted to help illustrate the basic characteristic of transient pressure loads, micro-pressure wave, as well as the wave propagation inside the tunnel regrading train’s passage and intersection. Results present the major findings as: (1) Transient pressure loads acting at tunnel surface and train body unevenly distributes along the longitudinal, transverse, and vertical directions. Pressure peak along the longitudinal direction occurs nearly at tunnel center and fast decreases from the radiated center to the remote positions. (2) Variation of pressure peak near the tunnel portal in the situation of train’s passage and intersection is limited while its value becomes doubled at the intersection location. Field measurements suggest the maximum pressure load acting at tunnel sidewall at xtin = 200 m and tunnel center being 4.29 and 5.63 kPa, respectively; (3) The maximum value of micro-pressure wave (namely MPW) detected in the field test is approximately 36.73 Pa. Amplitude of MPW at tunnel portal is inversely proportional to its attenuated distance. Through data fitting, an empirical prediction model was established. Outcomes of this paper is anticipated to improve the understanding of tunnel aerodynamic effect regarding higher speed level and its associated problems. Besides, findings of this paper are useful for the future tunnel design.

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Section: Introductionmentioning

confidence: 99%

Field Test and Numerical Investigation of Tunnel Aerodynamic Effect Induced by High-Speed Trains Running at Higher Speeds

Wang,

Ma,

Han

et al. 2023

Applied Sciences

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“…Accordingly, studies have been continuously carried out to assess the characteristics of the pressure wave inside a tunnel. Howe et al 3,4 established and validated theories on the characteristics of a compression wave in an experimental study of a high-speed train entering a tunnel. Bellenoue et al 5 analyzed the characteristics regarding the compression waves through an experimental study of the compression waves due to the train's tunnel entry and also predicted the influence of discomfort in the car body on the passengers.…”

Section: Introductionmentioning

confidence: 99%

“…Howe et al. 3,4 established and validated theories on the characteristics of a compression wave in an experimental study of a high-speed train entering a tunnel. Bellenoue et al.…”

Section: Introductionmentioning

confidence: 99%

Pressure wave characteristics of a high-speed train in a tunnel according to the operating conditions

Kim¹,

Rho²

2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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The pressure waves of a high-speed train in a tunnel exhibit complicated variations in their characteristics because the waves propagate and reflect with superposition. Studies have been consistently carried out on the pressure waves of a single train since changes in the area of pressure is a key element that influences ride comfort. Recently, the frequency of the operation of coupled trains has increased in order to improve the efficiency of running a train. The cross-sectional area of a train entering a tunnel has a rate of change that greatly influences the pressure characteristics; therefore, a coupled train can have different pressure characteristics when compared to a single train. However, adequate research works have not been done to assess these characteristics. To this end, the pressure characteristics of a train according to the operating conditions are investigated in this study. A high-speed train operating in practice and a tunnel located in a service section were chosen for this study, and the pressure characteristics of a single train were assessed via numerical analysis and an experiment. The numerical analysis was carried out with high reliability by comparing and verifying each result. After the pressure wave characteristics caused by running a coupled train had been assessed by the established numerical analysis, an obvious pressure variation was confirmed to occur at the connecting point. In addition, the maximum pressure applied to a tunnel and a passenger car increased. Thus, the aerodynamic effect of a coupled train should be considered as an important parameter in the early design state of a new high-speed train.

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“…Tünel portal modelleri: (a) duvar tip, (b) halka şekilli ve eğik yapılı, (c) şapka şekilli ve eğik yapılı, (d) üstü çift delikli düz şekilli (e) birleşik şapka eğik yapı[23] Pencereli bir flüt yapısı için ilk sıkışma dalgası ve mikro basınç dalgası üzerindeki etkisi Howe[24,43,44,45] tarafından incelenmiştir. Pencerelerin konum, sayı ve boyutlarının etkilerine ilişkin analizler detaylı olarak yapılmış; önerilen bazı değerler ve formüller ortaya konmuştur.…”

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Dünyadaki Son Gelişmeler Çerçevesinde Yüksek Hızlı Demiryolu Tünel Tasarımı ve Türkiye’deki Durum

Poşluk

2022

Demiryolu Mühendisliği

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Öz: Yüksek standartlı demiryolları, kat ettiği mesafeler ve içerdiği karmaşık mühendislik yapıları açısından oldukça zorlu imalatlardır. Gerek imalat gerekse işletmecilik faaliyetleri sırasında maliyet etkin olması istenir. Güzergâh çalışmalarından mühendislik yapılarının tasarımına kadar bu durumu etkileyen birçok parametre vardır. Bu çalışmada, yüksek hızlı demiryollarında tünel tasarımı konusuna odaklanmaktadır. Bu amaçla öncelikle yüksek hızlı demiryolu tünel tasarımında kullanılan ana hat ve tünel güvenliği konuları uluslararası standartlar çerçevesinde irdelenmiş, bu konuda dünyada yapılan son çalışmalar derlenmiştir. Ardından Türkiye'de geçmişi yaklaşık 20 yılı bulan yüksek hızlı demiryolu tünel imalat tecrübeleri aktarılmıştır. İlk tasarımından bu yana neredeyse hiç değişmeyen tünel yapısında, işletme sırasında oluşan sorunlar çerçevesinde yapısal ve geometrik iyileştirmeler gerektiği sonucuna varılarak bu kapsamda öneriler sunulmuştur.

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Rapid calculation of the compression wave generated by a train entering a tunnel with a vented hood: Short hoods

Cited by 19 publications

References 5 publications

Field Test and Numerical Investigation of Tunnel Aerodynamic Effect Induced by High-Speed Trains Running at Higher Speeds

Field Test and Numerical Investigation of Tunnel Aerodynamic Effect Induced by High-Speed Trains Running at Higher Speeds

Pressure wave characteristics of a high-speed train in a tunnel according to the operating conditions

Dünyadaki Son Gelişmeler Çerçevesinde Yüksek Hızlı Demiryolu Tünel Tasarımı ve Türkiye’deki Durum

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