Numerical analysis of aerodynamic noise from pantograph in high-speed trains using lattice Boltzmann method

Noh, Hee-Min

doi:10.1177/1687814019863995

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…1). This LBM configuration has been established in a sufficiently accurate turbulent simulation (Onodera et al 2013;King et al 2017;Deiterding and Wood 2016;Noh 2019), although other sophisticated methods have been proposed to reduce the error (Geier et al 2009(Geier et al , 2015Suga et al 2015). The discretized lattice Boltzmann equation is a prognostic equation of the distribution function for particles in the i th direction, f i , Fig.…”

Section: Cfd Modulementioning

confidence: 99%

Development of a snowdrift model with the lattice Boltzmann method

Tanji

Inatsu

Okaze

2021

Prog Earth Planet Sci

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We developed a snowdrift model to evaluate the snowdrift height around snow fences, which are often installed along roads in snowy, windy locations. The model consisted of the conventional computational fluid dynamics solver that used the lattice Boltzmann method and a module for calculating the snow particles’ motion and accumulation. The calculation domain was a half channel with a flat free-slip boundary on the top and a non-slip boundary on the bottom, and an inflow with artificially generated turbulence from one side to the outlet side was imposed. In addition to the reference experiment with no fence, experiments were set up with a two-dimensional and a three-dimensional fence normal to the dominant wind direction in the channel center. The estimated wind flow over the two-dimensional fence was characterized by a swirling eddy in the cross section, whereas the wind flow in the three-dimensional fence experiment was horizontally diffluent with a dipole vortex pair on the leeward side of the fence. Almost all the snowdrift formed on the windward side of the two-dimensional and three-dimensional fences, although the snowdrift also formed along the split streaks on the leeward side of the three-dimensional fence. Our results suggested that the fence should be as long as possible to avoid snowdrifts on roads.

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Section: Cfd Modulementioning

confidence: 99%

Development of a snowdrift model with the lattice Boltzmann method

Tanji

Inatsu

Okaze

2021

Prog Earth Planet Sci

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“…Aerodynamic noise analysis using LBM was found to be effective in large structures such as the pantograph of a high-speed train. 18…”

Section: Aerodynamic Noise Analysis Theorymentioning

confidence: 99%

Noise reduction in high-speed train gangways using fairings and side barriers

Noh

2020

Advances in Mechanical Engineering

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Interior noise in high-speed trains creates passenger discomfort and fatigue. In particular, the noise generated around the gangway between carriages tends to be easily transmitted to the passenger spaces due to the large noise component in the low-frequency region. In addition, the noise from the between-cars space around the gangway exterior tends to increase significantly when the high-speed train is travelling inside a tunnel. Therefore, this study analyses the cause of the noise generated in the gangways and identifies an effective method for reducing it. First, the mechanism for noise generation around the gangways was determined by computational flow noise analysis using a simple two-dimensional cavity model. From this simulation, it was confirmed that noise is generated when air flow enters the cavity. To investigate the influence of noise reduction in the between-cars section, blocking the airflow indirectly by installing fairings or directly by using side barriers was proposed. These noise reduction methods were examined by flow noise analysis, and then applied to an actual high-speed train. The interior noise was measured, and the results show that the use of side barriers was effective in reducing interior noise by 10 dB or more. In particular, a high noise reduction effect was exhibited in the low-frequency region. Therefore, this study verifies that directly blocking the inflow into the between-cars section is an effective noise reduction method.

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“…The results of the computational flow analysis allowed for a better understanding of the mechanism of noise generation in the pantograph. According to a related study, 16 the flow in the panhead section had continuous vortex shedding. In addition, a high amount of noise was generated from the back of the panhead through the flow.…”

Section: Pantograph Noise Measurementmentioning

confidence: 99%

“…Recently, a study was conducted to analyze the noise generated in the pantograph based on the lattice Boltzmann method. 16 However, the computational flow analysis of models with complex shapes such as pantographs require a lot of computational time for accurate noise analysis. Therefore, in general, analysis is often performed based on a simplified model, as there are limitations in analyzing the causes of noise generated according to detailed factors.…”

Section: Introductionmentioning

confidence: 99%

Wind tunnel test analysis to determine pantograph noise contribution on a high-speed train

Noh

2019

Advances in Mechanical Engineering

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In this study, we investigated the characteristics and the influence of the aero-acoustic noise generated from a pantograph using various experimental approaches in a wind tunnel. First, the noise generated at various flow velocities was measured and analyzed using a full-scale pantograph model. Then, the noise generated from the main position of the pantograph was derived using a microphone array attached to one side of a wind tunnel. The noise contributions of the main components of the pantograph were derived from the noise measurements obtained from a step-by-step disassembly of the full-scale model. In addition, the noise reduction achieved by panhead collectors, which are some of the most important noise sources on a pantograph, was examined by studying the results obtained when varying their geometry. In order to analyze the noise-reduction effect achieved by varying the height of the collector, different types of collectors were fabricated and wind tunnel tests were conducted. Through this study, we have investigated the aero-acoustic noise contribution of the major components of a pantograph, and we have developed effective noise-reduction measures for the panhead collector.

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Numerical analysis of aerodynamic noise from pantograph in high-speed trains using lattice Boltzmann method

Cited by 10 publications

References 24 publications

Development of a snowdrift model with the lattice Boltzmann method

Development of a snowdrift model with the lattice Boltzmann method

Noise reduction in high-speed train gangways using fairings and side barriers

Wind tunnel test analysis to determine pantograph noise contribution on a high-speed train

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