Acoustic model of micro-pressure wave emission from a high-speed train tunnel

Miyachi, Tokuzo

doi:10.1016/j.jsv.2016.09.031

Cited by 33 publications

(14 citation statements)

References 12 publications

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“…Figure-8 shows a clear directional dependence, with pressures being greatest in the direction of the tunnel axis and significantly smaller normal to the axis. Rev1.7 This behaviour is widely understood and, for simple obove-ground portals, it is amenable to analysis even without the aid of resource-consuming 3-D CFD (Miyachi, 2017;. By inspection, the importance of the effect is frequency-dependent, being greatest for the shortest wavefront.…”

Section: Above-ground Portalsmentioning

confidence: 99%

Characteristics of pressure waves radiated from tunnel portals in cuttings

Wang

Vardy

2022

Journal of Sound and Vibration

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Section: Above-ground Portalsmentioning

confidence: 99%

Characteristics of pressure waves radiated from tunnel portals in cuttings

Wang

Vardy

2022

Journal of Sound and Vibration

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“…The associate editor coordinating the review of this manuscript and approving it for publication was Dong Wang. linear discriminant analysis [12], and compressive sensing [13]. Currently, non-disassembling diagnosis techniques, including oil condition monitoring [14], hot-box detection [15], acoustic emission [16], acoustic holography [17], and wayside acoustic detector system [18], are typically employed. Investigating the wayside acoustic detector system has the following advantages: early failure detection, noncontact measurement, and lowered costs [19].…”

Section: Introductionmentioning

confidence: 99%

Combining Spatial Filtering and Sparse Filtering for Coaxial-Moving Sound Source Separation, Enhancement and Fault Diagnosis

Xiong

Ouyang

et al. 2019

IEEE Access

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The wayside acoustic detector system is a potential technique in ensuring the safety of traveling vehicles. However, multisource aliasing and Doppler distortion in acquired acoustic signals decrease the accuracy of machine diagnosis. The conventional multisource separation schemes fail to solve the coaxial-moving sound source (CMSS) problem by constructing time-frequency filters and designing one-dimensional time-varying spatial filters. To address this issue, this paper combines spatial filtering with sparse filtering to solve this problem. Spatial filtering could suppress but not eliminate undesired sources. Sparse filtering has no capability of coping with non-stationary signals with Doppler distortion. The combination of spatial filtering and sparse filtering could make up their shortcomings and effectively solve the CMSS problem. The proposed scheme has two main advantages of eliminating residual interferences completely and suppressing background noise effectively. The simulation and experimental cases verify the effectiveness of the proposed method. The results indicate the potential of the proposed method to improve the performance of wayside acoustic detector systems.

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“…To attenuate the steepening, the influence of ballast, branches, resonators, and absorbers are studied (Ozawa et al (1997), Vardy and Brown (2000), , Tebbutt et al (2017)). In stage (c), the influences of the exit hood and topography of the ground near the exit portal have been studied , Miyachi (2016)). However, as only few studies have investigated the phenomena in stages (b) and (c) with model facilities, good countermeasures to MPWs in these stages have not been developed yet.…”

Section: Introductionmentioning

confidence: 99%

Development of tunnel compression wave generator with multiple small solenoid valves

Miyachi

Arai

Shoji

et al. 2019

Mechanical Engineering Journal

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The micro-pressure wave (MPW) phenomenon caused by a high-speed train entering a tunnel consists of three stages: generation of the tunnel compression wave upon train entry, propagation of the tunnel compression wave through the tunnel, and emission of the MPW outward. Model experiments using train launcher facilities (TLFs) are effective for analyzing MPWs. However, the use of those facilities to study the latter two stages, i.e., the compression wave propagation and MPW emission, is hindered by two problems: high costs required for facility operation and construction, and low data productivity. Compression wave generators can potentially provide reasonable experiments. In this study, a new, simple facility was developed for the simulation of tunnel compression waves. The proposed generator consists of small solenoid valves, a pressure chamber, compressor, power supply system, and tunnel model. The performance analyses indicate that the compression waves generated by the designed facility effectively simulate tunnel compression waves generated by train entry. The pressure rise and wavelength of the compression wave are controlled by adjusting the chamber pressure and the voltage applied to the valves. The generator is expected to provide sufficient data to develop measures against MPWs in the propagation and emission stages as it reduces the required time by over 60% compared to that required by TLFs for each generation of the compression waves.

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Acoustic model of micro-pressure wave emission from a high-speed train tunnel

Cited by 33 publications

References 12 publications

Characteristics of pressure waves radiated from tunnel portals in cuttings

Characteristics of pressure waves radiated from tunnel portals in cuttings

Combining Spatial Filtering and Sparse Filtering for Coaxial-Moving Sound Source Separation, Enhancement and Fault Diagnosis

Development of tunnel compression wave generator with multiple small solenoid valves

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