Propagation of Compression Wave in a Long Tunnel with Slab Tracks

Fukuda, Takashi; Ozawa, Satoru; Iida, Michihisa; Takasaki, Toru; Wakabayashi, Yusuke; Miyachi, Tokuzo

doi:10.2219/rtriqr.46.188

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…The northern portal does not have an entrance hood for reducing the micro-pressure wave and the southern portal is joined to an adjacent tunnel by a snow-shelter. Frame-shaped slab tracks are laid in the test tunnel (10) , which are different from the flat-shaped slab tracks laid in the tunnel previously measured by the authors (1), (6), (7) . The frameshaped slab track is consists of parts to support a load of trains which laid in rail direction and ones to keep the gage which laid in left and right direction (see Fig.…”

Section: Introductionmentioning

confidence: 80%

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Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks

Fukuda

Ozawa

Iida

et al. 2006

JSME Int. J., Ser. B

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Field measurement and numerical simulation were performed on the distortion of the compression wave generated by train entry and propagating through a slab track Shinkansen tunnel, which is the longest mountain tunnel in the world as of 2004. The compression wave was measured at twelve different locations. In the numerical simulation, the distortion of the compression waveform were calculated by one-dimensional compressible flow analysis, which takes account of steady and unsteady friction, combined with acoustic analysis on the effect of side branches in the tunnel. The results of numerical simulation are consistent with those of the field measurement. Furthermore, the results indicate that the compression wavefront steepens in the early stage and smoothes down in the later stage of propagation, and the maximum value of the pressure gradient of the compression wavefront reaches a peak under certain conditions of the initial compression wave and a tunnel length.

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Section: Introductionmentioning

confidence: 80%

“…We verify the results of the numerical simulation with that of the field measurement, and investigate the distortion of the compression wave using the numerical simulation in detail. world as of 2004 (10) . Table 1 shows the specifications of the test tunnel, and Fig.…”

Section: Introductionmentioning

confidence: 99%

Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks

Fukuda

Ozawa

Iida

et al. 2006

JSME Int. J., Ser. B

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“…Secondary customers are all kinds of living community built along important arteries. Noise barrier construction bid determines the success or failure of the project, but market share of this part is very big [13]. Scale effect can be obtained by using the strategy of gaining high turnover through meager profit.…”

Section: Customer Analysismentioning

confidence: 99%

Market Analysis of Soundproof and Noise Reduction Plate

Chang

Wang²

2017

MATEC Web Conf.

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Abstract. Since the reform and opening up, China has a booming economy development, transportation industry as an important part of the economic processes has made a considerable progress, and continue to promote the rapid economic development. At the end of 2012, China's highway mileage has reached 4.238 million km and highway mileage ranks first in the world. Transportation in promoting rapid economic development, but also brings the traffic noise which has a tremendous influence on residents' daily life, and this influence has gradually deepening and widening, in this situation the production of noise reduction panel gradually emerged. In this paper, a noise barriers manufacturer' business model in Beijing Daxing District and analyze existing data will be analyzed, it will give much guidance and reference for a new noise reduction factory. The study has shown that plant will target all levels of government departments in charge of roads and the property of management department of residence as our customer groups, increasing technological innovation and improving product quality to establish a more extensive business relationships, and gradually formed noise barriers market competitiveness.

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“…(1) the momentum equation The distortion of the waveform of the compression wave propagating through tunnels has been studied using full-scale tests (Ozawa 1979;Fukuda et al 2005Fukuda et al , 2006, scale-model tests (Aoki et al 1994;Sasoh et al 1997), theoretical analysis (Sugimoto 1992), and numerical simulations (Ozawa 1979;Mashimo et al 1995;Fukuda et al 1999Fukuda et al , 2006. Numerical simulations using a one-dimensional model were validated as suitable for a variety of the tunnel lengths, which largely affects the computing time (Yoon et al 2001a;Vardy et al 2000).…”

Section: Equations Governing Compression Wavementioning

confidence: 99%

“…In addition, the effect of the number of side branches was studied by Yamaoto (1984) based on the model used by Ozawa (1979). Most of the results presented show that the effect of the side branches on the distortion of the waveform is combined with the entrance hoods (Fukuda et al 2005(Fukuda et al , 2006. However, the effect of side branches having different parameters such as depth, crosssectional area, location, and number was not systematically investigated.…”

Section: Equations Governing Compression Wavementioning

confidence: 99%

The Effects of Side Branches on Compression Waves Propagating in High-Speed Railway Tunnels

2013

Advances in Structural Engineering

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According to the theory of finite amplitude sound waves, a one-dimensional compressible unsteady non-homentropic flow model, and the method of characteristics based on the average parameter method are applied to calculate the propagation of entry compression waves in a tunnel, in which the strength of the entry compression wave mainly affects the magnitude of the micro-pressure wave. In addition, acoustical principles are used to simulate the effect of side branches in the tunnel on the sound wave to elucidate the distortion of the waveform of the compression wave. A real-world comparison shows that the programs presented correctly reveal the distortion of the compression wave in the tunnel. After validation, the effects of the number, location, and depth of the side branches are studied in detail. The results show that any change in the parameters of a single side branch has almost no effect on the distortion of the waveform of the compression wave. An increase in the number of side branches, however, does make their effect more significant. This is due to an increase in streaming and reflections which substantially reduce the pressure gradient of the compression wave arriving at the exit portal of the tunnel.

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Propagation of Compression Wave in a Long Tunnel with Slab Tracks

Cited by 8 publications

References 7 publications

Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks

Distortion of Compression Wave Propagating through Very Long Tunnel with Slab Tracks

Market Analysis of Soundproof and Noise Reduction Plate

The Effects of Side Branches on Compression Waves Propagating in High-Speed Railway Tunnels

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