2024 Micro-pressure wave radiated from tunnel exit

Micro-pressure wave radiated from tunnel exit

Author: zyex

August undefined, 2024

WebREDUCTION OF MICRO-PRESSURE WAVE RADIATED FROM TUNNEL EXIT BY SIDE BRANCHES IN TUNNEL. When a train enters a tunnel, a pressure pulse called a … WebBackground-corrected sound pressure levels are identified and then compared with the source levels measured in the cavitation tunnel of the Potsdam Model Basin (SVA). It is found that free-field computations corrected by tunnel-induced effects match well with experiments up to 100 Hz (in the one-third octave band), whereas relevant ...

Efficient prediction methods for the micro-pressure wave from a …

WebMar 1, 2011 · Abstract. When a compression wave generated by a high-speed train entering a tunnel propagates through the tunnel and arrives at the tunnel exit, an impulsive … WebDec 1, 2024 · A micro-pressure wave is discharged from the exit of the train tunnel when a compression wave induced by a high-speed train moves outside the exit of the train … harmony table lamp

Full-Scale Measurement of Micropressure Waves in High …

WebApr 15, 2024 · To study the influence of launch conditions and wave interference on the stability of submersible aerial vehicles at the water–air interface, a coupling model for water-exit motion of submersible aerial vehicles was established by using the RNG k-ε turbulence model and VOF method. The water-exit processes of submersible … WebMar 17, 2024 · The pressure at the upstream (left-hand) end of the tunnel is then increased rapidly in a prescribed manner, causing a steep-fronted wavefront to propagate along the tunnel. When the wavefront reaches the exit portal, it reflects back along the tunnel and … Table 2 and Fig. 18 (c) indicated that a limited reduction of approximately 4.88% … Reduction of micro-pressure wave radiated from tunnel exit by hood at tunnel … An impulse wave is a micro-pressure wave, which leads to environment problems … In all test cases the flow rate is increased linearly from an initial steady state … Then the main micro-pressure wave “a” and the branch micro-pressure wave “ a ′ ” are … WebMay 25, 2013 · When a train enters a tunnel at high speed, an impulsive pressure wave, called a micro-pressure wave, is radiated from a tunnel exit portal. Because it is one of … chapter 13 boy in the striped pajamas

Experimental investigation on tunnel sonic boom SpringerLink

WebMeasures to Counteract Micro-pressure Waves Radiating from Tunnel Exits of DB’s New Nuremberg-Ingolstadt High-Speed Line. In: , et al. Noise and Vibration Mitigation for Rail … WebGao, Reducing pressure wave fluctuation of high-speed train in long tunnel based on connected aisle, Eng. Mechan., № 37, с. 230 Guo, Parameter study and optimization design of a hat oblique tunnel portal, Proceedings of the Institution of Mechan. chapter 13 business bankruptcy explainedWebtitle = "Micro-pressure wave radiation from tunnel portals in deep cuttings", abstract = "The reflection and radiation of steep-fronted wavefronts at a tunnel exit to a deep cutting is … harmony swimming pool

"WebUpon the entrance of a high-speed train into a relatively long train tunnel, compression waves are generated in front of the train. These compression waves subsequently coalesce into a weak shock wave so that a unpleasant sonic boom is emitted from the tunnel exit. " - Micro-pressure wave radiated from tunnel exit

Micro-pressure wave radiated from tunnel exit

Research on the characteristics of micro-pressure waves in high ...

WebGeneration of the compression wave by a train entering a tunnel is investigated by model experiments. In the model experiments, the train and the tunnel are represented by an axisymmetric model, a three-dimensional mirror image model and … WebSep 12, 2006 · When micro-pressure wave radiation at tunnel portals has to be simulated, a more accurate prediction of pressure gradients is required in order to capture the …

Did you know?

WebMay 19, 2024 · The reflection and radiation of steep-fronted wavefronts at a tunnel exit to a deep cutting is studied and contrasted with the more usual case of radiation from over-ground portals. ... Micro-pressure wave radiation from tunnel portals in deep cuttings Show all authors. Honglin Wang 1. Honglin Wang . School of Mechanical Engineering, …

WebREDUCTION OF MICRO-PRESSURE WAVE RADIATED FROM TUNNEL EXIT BY HOOD AT TUNNEL ENTRANCE An explosive noise produced by high-speed trains emerging from … WebAug 16, 2024 · The relationship between the MPW and the nose-entry wave and the effects of train speed and the tunnel exit hole on the MPW are analyzed. The results show that the MPW decreases with...

WebSep 26, 2024 · The relationship between the MPW and the nose-entry wave and the effects of train speed and the tunnel exit hole on the MPW are analyzed. The results show that the MPW decreases with increasing distance from the tunnel exit, but increases rapidly with increasing train speeds. WebFeb 1, 2024 · Micro-pressure wave emission from tunnel portals in high-speed railways causes environmental issues. Tunnel hoods installed in the tunnel portals reduce the micro-pressure wave...

WebMay 19, 2024 · Abstract. The reflection and radiation of steep-fronted wavefronts at a tunnel exit to a deep cutting is studied and contrasted with the more usual case of radiation …

WebThe authors used FLUENT (pressure based code) as their multiphase solver and the Schnerr–Sauer cavitation model. Two frequency peaks were identified to be caused by cavitation. The lower peak was reported to be related to cloud shedding at 3 kHz and the higher peak was related to the collapse of small bubbles at 6 kHz. chapter 13 buy used car loan outside of planWebSep 12, 2006 · Micro-pressure waves are recorded in a point located 20 mm above the tunnel ground and 120 mm far from the tunnel exit. Time histories of pressure inside the tunnel are also monitored in different sections. chapter 13 business bankruptcyWebOct 27, 1998 · An analytical investigation is made of the compression wave generated when a high-speed train enters a long tunnel with distributed venting. The compression wave amplitude is determined by train speed and the area ratio of the train and tunnel, but its rise time depends principally on the geometry of the tunnel entrance. chapter 13 ccpWebMar 13, 2003 · A micro-pressure wave depends on the pressure gradient of the compression wave at the tunnel exit. We measured and investigated the distortion … chapter 13 capital budgeting decisionsWebAug 4, 2015 · The micropressure wave radiated from a tunnel exit is one of the environmental problems which can be investigated from the temporal pressure gradient of the compression wave. chapter 13 checkpoint public opinionWebOct 29, 2001 · The compression wave generated by a high-speed train emerging from the exit portal of a tunnel gives rise to an impulsive noise called a micro-pressure wave. In this study, new methods for the prediction of sonic-boom noise are proposed. The first method combines acoustic monopole analysis and the method of characteristics with the … harmony tai chi centerWebJun 1, 2024 · 1. Introduction. When the nose tip of a high-speed train enters a tunnel, a compression wave will be generated ahead of the train, a small part of which radiates outward from the tunnel exit, thus forming a micro-pressure wave (MPW) (Miyachi, 2024; Ozawa, 1979).Excessive pulse-like pressure waves not only adversely affect the tunnel … harmony tailoring and alterations