Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms

A pantograph receives aerodynamic force while a train is traveling. As the aerodynamic force increases in proportion to the square of the flow velocity relative to the pantograph, its influence on the pantograph becomes apparent, especially for high-speed trains. When a high-speed train runs in a tu...

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Autores principales:	Katsuhiro KIKUCHI, Yuhei NOGUCHI, Minoru SUZUKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	flow velocity measurement train tunnel restoration filter fluctuating flow velocity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/7e0e7477182e4ee58274df95977a77f4
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spelling	oai:doaj.org-article:7e0e7477182e4ee58274df95977a77f42021-11-29T06:09:58ZAnalysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms2187-974510.1299/mej.21-00100https://doaj.org/article/7e0e7477182e4ee58274df95977a77f42021-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_21-00100/_pdf/-char/enhttps://doaj.org/toc/2187-9745A pantograph receives aerodynamic force while a train is traveling. As the aerodynamic force increases in proportion to the square of the flow velocity relative to the pantograph, its influence on the pantograph becomes apparent, especially for high-speed trains. When a high-speed train runs in a tunnel, the flow velocity relative to the pantograph is faster than that in an open section. In this study, we measured the flow velocity around a train model running in a tunnel using a rake of total-pressure tubes mounted on the train model. The measured waveforms were distorted owing to the influence of the frequency characteristics of the measurement system. Therefore, we developed a restoration method and applied it to the measured waveforms to obtain the restored waveforms of the flow velocity. With the restored waveforms, we obtained several statistical values, such as the average flow velocity and standard deviation of the fluctuating flow velocity around the train model. Furthermore, we proposed a method for predicting the flow velocity around the train model, including fluctuating components in a frequency range of a pantograph contact performance. The proposed method can predict the flow velocity at the panhead of a pantograph by considering the average flow velocity profile and turbulence component profile in the tunnel cross section, which could not be taken into account so far.Katsuhiro KIKUCHIYuhei NOGUCHIMinoru SUZUKIThe Japan Society of Mechanical Engineersarticleflow velocity measurementtraintunnelrestoration filterfluctuating flow velocityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 21-00100-21-00100 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	flow velocity measurement train tunnel restoration filter fluctuating flow velocity Mechanical engineering and machinery TJ1-1570
spellingShingle	flow velocity measurement train tunnel restoration filter fluctuating flow velocity Mechanical engineering and machinery TJ1-1570 Katsuhiro KIKUCHI Yuhei NOGUCHI Minoru SUZUKI Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
description	A pantograph receives aerodynamic force while a train is traveling. As the aerodynamic force increases in proportion to the square of the flow velocity relative to the pantograph, its influence on the pantograph becomes apparent, especially for high-speed trains. When a high-speed train runs in a tunnel, the flow velocity relative to the pantograph is faster than that in an open section. In this study, we measured the flow velocity around a train model running in a tunnel using a rake of total-pressure tubes mounted on the train model. The measured waveforms were distorted owing to the influence of the frequency characteristics of the measurement system. Therefore, we developed a restoration method and applied it to the measured waveforms to obtain the restored waveforms of the flow velocity. With the restored waveforms, we obtained several statistical values, such as the average flow velocity and standard deviation of the fluctuating flow velocity around the train model. Furthermore, we proposed a method for predicting the flow velocity around the train model, including fluctuating components in a frequency range of a pantograph contact performance. The proposed method can predict the flow velocity at the panhead of a pantograph by considering the average flow velocity profile and turbulence component profile in the tunnel cross section, which could not be taken into account so far.
format	article
author	Katsuhiro KIKUCHI Yuhei NOGUCHI Minoru SUZUKI
author_facet	Katsuhiro KIKUCHI Yuhei NOGUCHI Minoru SUZUKI
author_sort	Katsuhiro KIKUCHI
title	Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
title_short	Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
title_full	Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
title_fullStr	Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
title_full_unstemmed	Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
title_sort	analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/7e0e7477182e4ee58274df95977a77f4
work_keys_str_mv	AT katsuhirokikuchi analysisofflowvelocityfluctuationaroundatrainmodelrunninginatunnelusingrestoredwaveforms AT yuheinoguchi analysisofflowvelocityfluctuationaroundatrainmodelrunninginatunnelusingrestoredwaveforms AT minorusuzuki analysisofflowvelocityfluctuationaroundatrainmodelrunninginatunnelusingrestoredwaveforms
_version_	1718407595733024768

Analysis of flow velocity fluctuation around a train model running in a tunnel using restored waveforms

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