Characteristics of Noise Reduction in Helmholtz Resonator in Exhaust Systems
排気系におけるヘルムホルツ共鳴器の消音特性
The Helmholtz resonator not only reduces exhaust noise in resonance frequency, but also increases in other frequencies. The silencer property can control the damping in the neck of the Helmholtz resonator. In order to obtain the damping, the neck diameter must be small. Because the particle velocity is high at the neck due to the high-pressure fluctuation in the exhaust system, the pressure drop is high at the narrow pipe. When a Helmholtz resonator is designed, it is advised to control the damping at the neck diameter and the frequency at the neck length.共鳴器を装着すると，排気音は共鳴周波数で消音するが，他の周波数で増音する．増音は共鳴器の首部の細径化による減衰の付与で抑制できる．減衰が直径に依存する原因は，高音圧下のため首部での粒子速度が大きく，拡縮流での圧力損失が大きいためである．設計する際は，首部の直径で減衰を，長さで周波数を制御すると良い．
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/02878321
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Authors:
- Esaki, Takashi
- Publication Date: 2012
Language
- English
- Japanese
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
- Pagination: pp 217-224
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Serial:
- Transactions of Society of Automotive Engineers of Japan
- Volume: 43
- Issue Number: 2
- Publisher: Society of Automotive Engineers of Japan
- ISSN: 0287-8321
- EISSN: 1883-0811
- Serial URL: https://www.jstage.jst.go.jp/browse/jsaeronbun
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Publication flags:
Open Access (libre)
Subject/Index Terms
- TRT Terms: Damping (Engineering); Exhaust system components; Noise control; Physical properties; Resonance frequency; Traffic noise
- Subject Areas: Design; Environment; Highways; Vehicles and Equipment; I15: Environment; I91: Vehicle Design and Safety;
Filing Info
- Accession Number: 01517595
- Record Type: Publication
- Source Agency: Japan Science and Technology Agency (JST)
- Files: TRIS, JSTAGE
- Created Date: Mar 10 2014 10:52AM