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Noise in the passenger cars of high-speed trains

Title
Noise in the passenger cars of high-speed trains
Author
전진용
Keywords
FLOOR IMPACT SOUNDS; QUALITATIVE ASPECTS; INTENSITY
Issue Date
2015-12
Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
Citation
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, v. 138, NO 6, Page. 3513-3521
Abstract
The aim of this study is to investigate the effects of both room acoustic conditions and spectral characteristics of noises on acoustic discomfort in a high-speed train's passenger car. Measurement of interior noises in a high-speed train was performed when the train was operating at speeds of 100 km/h and 300 km/h. Acoustic discomfort caused by interior noises was evaluated by paired comparison methods based on the variation of reverberation time (RT) in a passenger car and the spectral differences in interior noises. The effect of RT on acoustic discomfort was not significant, whereas acoustic discomfort significantly varied depending on spectral differences in noise. Acoustic discomfort increased with increment of the sound pressure level (SPL) ratio at high frequencies, and variation in high-frequency noise components were described using sharpness. Just noticeable differences of SPL with low-and high-frequency components were determined to be 3.7 and 2.9 dB, respectively. This indicates that subjects were more sensitive to differences in SPLs at the high-frequency range than differences at the low-frequency range. These results support that, for interior noises, reduction in SPLs at high frequencies would significantly contribute to improved acoustic quality in passenger cars of high-speed trains. (C) 2015 Acoustical Society of America.
URI
http://asa.scitation.org/doi/10.1121/1.4936900http://hdl.handle.net/20.500.11754/29248
ISSN
0001-4966; 1520-8524
DOI
10.1121/1.4936900
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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