Active Attenuation of Low Frequency Noise Radiated from Tunnel Exit of High Speed Train

1994 ◽  
Vol 13 (2) ◽  
pp. 39-47
Author(s):  
Min Liang ◽  
Toshiya Kitamura ◽  
Katsushi Matsubayashi ◽  
Toshifumi Kosaka ◽  
Tatsuo Maeda ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Pressure Wave ◽  
High Speed ◽  
Outer Space ◽  
Low Frequency ◽  
Close Relation ◽  
Frequency Noise ◽  
High Speed Train ◽  
Low Frequency Noise ◽  
Active Cancellation

A pressure wave occurs at the instant when a high speed train enters into a long tunnel. The wave propagates downstream to the tunnel exit and low frequency noise is radiated from the exit to outer space. The low frequency noise causes a lot of problems1 to the residents living near the exit and has a close relation with the pressure gradient of the pressure wave. To attenuate the low frequency noise, an active cancellation system rather than a passive one is developed. This research uses a model tunnel to examine the characteristic of the pressure wave and investigates the possibility to reduce the low frequency noise by reducing the pressure wave gradient with active cancellation.

Study of Low Frequency Noise Occurred from Tunnel Entrance of High Speed Train

2001 ◽  
Vol 2001.11 (0) ◽  
pp. 120-122
Author(s):  
Toshiya KITAMURA ◽  
Yasuhiko OKAWA ◽  
Toshikazu KATO ◽  
Shinji YAMADA
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Frequency Noise ◽  
High Speed Train ◽  
Low Frequency Noise ◽  
Tunnel Entrance

scholarly journals Low-Frequency Noise Radiated from a High-Speed Train Passing an Open Section

2007 ◽  
Vol 73 (735) ◽  
pp. 2275-2282 ◽  
Author(s):  
Hajime TAKAMI ◽  
Katsuhiro KIKUCHI ◽  
Hiroshi MAEKAWA ◽  
Takeshi KURITA ◽  
Yusuke WAKABAYASHI
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Frequency Noise ◽  
High Speed Train ◽  
Low Frequency Noise ◽  
Open Section

Active Control of Impulsive Low Frequency Noise Emitted from Tunnel Exit of High Speed Train

1998 ◽  
Vol 17 (3) ◽  
pp. 141-151
Author(s):  
Toshiya Kitamura ◽  
Min Liang ◽  
Makoto Uzawa ◽  
Masayuki Teranishi ◽  
Jun-Ichi Takano ◽  
...  
Keyword(s):  
Active Control ◽  
High Speed ◽  
Low Frequency ◽  
Frequency Noise ◽  
High Speed Train ◽  
Low Frequency Noise

125 Low-Frequency Noise Radiated from a High-speed Train Running in an Open Section

2006 ◽  
Vol 2006.16 (0) ◽  
pp. 114-115
Author(s):  
Hajime TAKAMI ◽  
Katsuhiro KIKUCHI ◽  
Masanobu IIDA ◽  
Hiroshi MAEKAWA ◽  
Takeshi KURITA ◽  
...  
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Frequency Noise ◽  
High Speed Train ◽  
Low Frequency Noise ◽  
Open Section

Low Frequency Noise in High Speed SiGe:C HBTs after Forward and Mixed-Mode Stress

2009 ◽  
Author(s):  
Malick Diop ◽  
Cedric Leyris ◽  
Nathalie Revil ◽  
Mathieu Marin ◽  
Gérard Ghibaudo ◽  
...  
Keyword(s):  
Mixed Mode ◽  
High Speed ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Mode Stress

Infra-sound cancellation and mitigation in wind turbines

2018 ◽  
Vol 7 (1) ◽  
pp. 73-81
Author(s):  
Albert Boretti ◽  
Andrew Ordys ◽  
Sarim Al Zubaidy
Keyword(s):  
Hearing Loss ◽  
Amplitude Modulation ◽  
Pressure Wave ◽  
Endolymphatic Hydrops ◽  
Low Frequency ◽  
Frequency Noise ◽  
Frequency Range ◽  
Large Pressure ◽  
Active Cancellation ◽  
Sound Cancellation

Abstract The infra-sound spectra recorded inside homes located even several kilometres far from wind turbine installations is characterized by large pressure fluctuation in the low frequency range. There is a significant body of literature suggesting inaudible sounds at low frequency are sensed by humans and affect the wellbeing through different mechanisms. These mechanisms include amplitude modulation of heard sounds, stimulating subconscious pathways, causing endolymphatic hydrops, and possibly potentiating noise-induced hearing loss. We suggest the study of infra-sound active cancellation and mitigation to address the low frequency noise issues. Loudspeakers generate pressure wave components of same amplitude and frequency but opposite phase of the recorded infra sound. They also produce pressure wave components within the audible range reducing the perception of the infra-sound to minimize the sensing of the residual infra sound.

Field Measurement of Wayside Low-Frequency Noise Emitted from Tunnel Portals and Trains of High-Speed Railway

2005 ◽  
Vol 24 (4) ◽  
pp. 219-231 ◽  
Author(s):  
K. Kikuchi ◽  
M. Iida ◽  
T. Takasaki ◽  
H. Takami
Keyword(s):  
High Speed ◽  
Near Field ◽  
Low Frequency ◽  
Hydrodynamic Pressure ◽  
Field Measurements ◽  
Frequency Noise ◽  
Pressure Waves ◽  
Low Frequency Noise ◽  
Open Section ◽  
Tunnel Portal

In order to determine the actual circumstances of wayside low-frequency noise and infrasound generated by high-speed trains (Shinkansen), field measurements were performed at two sites, one near a tunnel portal and the other in a fully open section. The measurements were based upon the manual issued by the Ministry of the Environment of Japan in October 2000 and conducted to obtain G-weighted SPL, 1/3-octave band spectra, velocity dependence and distance attenuation of SPL. The measured results show that major components of the low-frequency noise from the tunnel portal are impulsive micro-pressure waves and continuous pressure waves, while those in the open section are near-field hydrodynamic pressure variations and far-field acoustic pressure waves.

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