Study of analysis method of interior noise in railway cars by means of ray tracing method

We have studied the analysis method of interior noise in railway cars by means of a ray tracing method. Firstly, by using a point source as input, sound distribution inside a car was analysed and compared with the measurement result obtained by a loud speaker test. It was found that the analysis res...

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Autores principales:	Takashi YOSHIZAWA, Toshihiko MOCHIDA, Toru YAMAZAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	ray tracing method statistical energy analysis interior noise railway car sound distribution Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/2de93eefedfd46779e083dd232c75ddf
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spelling	oai:doaj.org-article:2de93eefedfd46779e083dd232c75ddf2021-11-29T05:47:05ZStudy of analysis method of interior noise in railway cars by means of ray tracing method2187-974510.1299/mej.18-00449https://doaj.org/article/2de93eefedfd46779e083dd232c75ddf2019-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/5/6_18-00449/_pdf/-char/enhttps://doaj.org/toc/2187-9745We have studied the analysis method of interior noise in railway cars by means of a ray tracing method. Firstly, by using a point source as input, sound distribution inside a car was analysed and compared with the measurement result obtained by a loud speaker test. It was found that the analysis result of sound decay along the longitudinal direction of the car did not always match the measurement result. It is possibly because the wave character of the sound cannot be strictly simulated by the ray tracing method. However, for the purpose of analysing the sound distribution while the train is running, it may not be necessary to accurately simulate the sound decay in the longitudinal direction, because the sound sources are distributed everywhere inside the running car and therefore the importance of the sound decay along the longitudinal direction may be low. Based on this perspective, we have proposed the interior noise analysis method for the running condition by applying multiple sources inside the car. The amplitude of each source was estimated from the measured vibration of the interior panels as well as from the estimated radiation efficiency of each panel. Validation of the analysis was conducted by comparison with the measured data of the interior noise inside the running train, and it was confirmed that the level of interior noise reduction by the installation of passenger seats matched well between the analysis and the measurement.Takashi YOSHIZAWAToshihiko MOCHIDAToru YAMAZAKIThe Japan Society of Mechanical Engineersarticleray tracing methodstatistical energy analysisinterior noiserailway carsound distributionMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 5, Pp 18-00449-18-00449 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	ray tracing method statistical energy analysis interior noise railway car sound distribution Mechanical engineering and machinery TJ1-1570
spellingShingle	ray tracing method statistical energy analysis interior noise railway car sound distribution Mechanical engineering and machinery TJ1-1570 Takashi YOSHIZAWA Toshihiko MOCHIDA Toru YAMAZAKI Study of analysis method of interior noise in railway cars by means of ray tracing method
description	We have studied the analysis method of interior noise in railway cars by means of a ray tracing method. Firstly, by using a point source as input, sound distribution inside a car was analysed and compared with the measurement result obtained by a loud speaker test. It was found that the analysis result of sound decay along the longitudinal direction of the car did not always match the measurement result. It is possibly because the wave character of the sound cannot be strictly simulated by the ray tracing method. However, for the purpose of analysing the sound distribution while the train is running, it may not be necessary to accurately simulate the sound decay in the longitudinal direction, because the sound sources are distributed everywhere inside the running car and therefore the importance of the sound decay along the longitudinal direction may be low. Based on this perspective, we have proposed the interior noise analysis method for the running condition by applying multiple sources inside the car. The amplitude of each source was estimated from the measured vibration of the interior panels as well as from the estimated radiation efficiency of each panel. Validation of the analysis was conducted by comparison with the measured data of the interior noise inside the running train, and it was confirmed that the level of interior noise reduction by the installation of passenger seats matched well between the analysis and the measurement.
format	article
author	Takashi YOSHIZAWA Toshihiko MOCHIDA Toru YAMAZAKI
author_facet	Takashi YOSHIZAWA Toshihiko MOCHIDA Toru YAMAZAKI
author_sort	Takashi YOSHIZAWA
title	Study of analysis method of interior noise in railway cars by means of ray tracing method
title_short	Study of analysis method of interior noise in railway cars by means of ray tracing method
title_full	Study of analysis method of interior noise in railway cars by means of ray tracing method
title_fullStr	Study of analysis method of interior noise in railway cars by means of ray tracing method
title_full_unstemmed	Study of analysis method of interior noise in railway cars by means of ray tracing method
title_sort	study of analysis method of interior noise in railway cars by means of ray tracing method
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/2de93eefedfd46779e083dd232c75ddf
work_keys_str_mv	AT takashiyoshizawa studyofanalysismethodofinteriornoiseinrailwaycarsbymeansofraytracingmethod AT toshihikomochida studyofanalysismethodofinteriornoiseinrailwaycarsbymeansofraytracingmethod AT toruyamazaki studyofanalysismethodofinteriornoiseinrailwaycarsbymeansofraytracingmethod
_version_	1718407577018040320

Study of analysis method of interior noise in railway cars by means of ray tracing method

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