飛行モードによる羽ばたき音の特性の違いについて

機関リポジトリ

書誌事項

タイトル別名
  • Flapping Sound Characteristics under Different Flying Modes

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説明

平成21年6月18-19日. 宇宙航空研究開発機構調布航空宇宙センター

18 June-19 June, 2009, Japan Aerospace Exploration Agency

Flapping motion consists of combined motions of wing reciprocation and rotation, and thus generates complex flow field and pressure change around the wing, which produce typical sound sources such as dipole or quadrupole sources. This implies the control of flapping sound is an important issue to realize practical flapping wing air vehicles. For this purpose, we developed a numerical scheme to analyze sound generation and transmission of flapping wing by combining CFD and acoustic analyses. This scheme is applied to two types of motions, i.e. hovering and forward moving motion of insect (hawkmoth). Conspicuous similarity is found in both flying types, i.e. the dominance of fundamental frequency wave in front and the second or higher harmonic wave in side or bottom. Another similarity is found in the sound directivity, i.e. the strong sound transmission in the direction perpendicular to the flapping plane and the weak transmission in the direction parallel to the flapping plane. These results clearly represent the relationship between wing motion and sound characteristics, and thus providing us with insights on the control methods of flapping sound.

形態: カラー図版あり

Physical characteristics: Original contains color illustrations

資料番号: AA0064672023

レポート番号: JAXA-SP-09-011

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詳細情報 詳細情報について

  • CRID
    1050292561262626816
  • NII論文ID
    120006828392
  • NII書誌ID
    AA11984031
  • ISSN
    1349113X
  • Web Site
    http://id.nii.ac.jp/1696/00004915/
  • 本文言語コード
    ja
  • 資料種別
    conference paper
  • データソース種別
    • IRDB
    • CiNii Articles

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