368 音響的ソフト境界により構成される消音器のダクト騒音低減性能について

• 藤原 恭司

  九大

• 川瀬 康彰

  成田国際空港振興協会

• 斉藤 歩美

  九大院

書誌事項

タイトル別名

• 368 Duct noise reduction efficiency of a silencer composed of acoustically soft boundaries

抄録

An effective silencer of an air conditioning duct is studied. A duct with an acoustically soft boundary is employed as the effective silencer. On the acoustically soft boundary the sound pressure is zero and it is impossible to realize in the air-borne sound field, because of the non-existence of very much lighter medium than the air. In this study, an arrangement of one-quarter wave length acoustic tubes is employed as the soft boundary. This acoustic tube has frequency dependence, but sound pressure becomes nearly zero at the tube mouth around odd resonance frequency. Several numerical and experimental examples of duct silencers composed of acoustically soft boundaries are presented.

収録刊行物

• Dynamics & Design Conference

  Dynamics & Design Conference 2009 (0), _368-1_-_368-4_, 2009

  一般社団法人 日本機械学会

キーワード

• Duct noise control
• Acoustically soft boundary
• Silencer

詳細情報

• CRID: 1390001205890528896
• NII論文ID: 110008087451
• DOI: 10.1299/jsmedmc.2009._368-1_
• ISSN: 24242993
• Web Site: https://www.jstage.jst.go.jp/article/jsmedmc/2009/0/2009__368-1_/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可