{"created":"2023-06-20T14:35:52.581078+00:00","id":2154,"links":{},"metadata":{"_buckets":{"deposit":"7316fc4f-5043-4e01-ac58-da9a658eb7e4"},"_deposit":{"created_by":1,"id":"2154","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2154"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00002154","sets":["1887:1893","9:10:147:180"]},"author_link":["3797","3795","3792","3794","3793","3796"],"item_3_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Comprehensive study on active flap control for BVI noise reduction"}]},"item_3_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-02-29","bibliographicIssueDateType":"Issued"},"bibliographicVolumeNumber":"JAXA-RR-07-020","bibliographic_titles":[{"bibliographic_title":"宇宙航空研究開発機構研究開発報告"},{"bibliographic_title":"JAXA Research and Development Report","bibliographic_titleLang":"en"}]}]},"item_3_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"ヘリコプタ全機周りの流れ場を解析する3次元非定常オイラー・コードをベースに、ブレード／渦干渉(Blade-Vortex Interaction: BVI)騒音低減用のアクティブ・フラップ制御(Active Flap Control: AFC)を解析するコードを開発し、Ffowcs Williams and Hawkings(FW-H)の式に基づく音響解析コードと組み合わせることで、AFCの重要な2つのパラメータであるフラップの位相角と取り付け位置が騒音に及ぼす影響を解析した。ここで、位相角の影響を容易に把握するための簡易的なモデルを提案し、そこから得られる知見を適用することで、実験値の予測を格段に改善できることを示した。また、ここで用いた特定の条件では、位相角60度のとき5.62dBの騒音低減効果が得られた。フラップ位置の影響については、より翼端に近い位置に配置されたフラップを適正な位相角で作動させることが騒音低減に有効であることを示した。また、フラップを翼端に近い位置に配置した場合、フラップの外端から発生するフラップ渦がブレードの翼端渦と融合する現象が捉えられた上、それが翼端渦の強度に影響を及ぼしてBVIの起こる瞬間にブレード上圧力変動を増加させることを確認した。さらに、フラップ位置を内側から外側に移動させると、ある位置を境に騒音低減のメカニズムが劇的に変わることが分かったが、そのメカニズム解明については今後の課題である。","subitem_description_type":"Abstract"}]},"item_3_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"A three-dimensional unsteady Euler code for the analysis of Active Flap Control (AFC) has been developed in this study based on an advanced CFD (Computational Fluid Dynamics) code for the full configuration of helicopters. The effect of phase angle and geometric position of AFC on Blade-Vortex Interaction (BVI) noise is analyzed by combining the new CFD code with an acoustic code based on the Ffowcs Williams and Hawkings (FW-H) equation. As a result, a simple model is proposed to understand the effect of flap phase angle on BVI noise and 3D calculations by the present method confirm that the model properly works. The prediction of the effect of flap phase angle by the present method is remarkably improved by applying the understandings derived from the simple model. A quantitative noise reduction of 5.62 dB is obtained at the flap phase angle of 60 deg and noise signal strongly propagates almost downward in the present condition. The prediction of flap position effect shows that more effective BVI noise reduction can be achieved by the flap at the outer position with well-adjusted phase. When the flap is located near the blade tip, the merger between outer flap vortex and tip vortex can change the tip vortex strength and the blade surface pressure in the BVI condition. As the flap location moves inward, the sudden change of BVI noise reduction mechanism happens, which needs more discussion for the understandings.","subitem_description_type":"Other"}]},"item_3_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0063803000","subitem_description_type":"Other"}]},"item_3_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: JAXA-RR-07-020","subitem_description_type":"Other"}]},"item_3_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構"}]},"item_3_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Japan Aerospace Exploration Agency (JAXA)"}]},"item_3_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1349-1113","subitem_source_identifier_type":"ISSN"}]},"item_3_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA1192675X","subitem_source_identifier_type":"NCID"}]},"item_3_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"宇宙航空研究開発機構 総合技術研究本部　計算科学研究グループ"},{"subitem_text_value":"宇宙航空研究開発機構 総合技術研究本部　計算科学研究グループ"},{"subitem_text_value":"宇宙航空研究開発機構 航空プログラムグループ　運航・安全技術チーム"}]},"item_3_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Japan Aerospace Exploration Agency Computational Science Research Group, Institute of Aerospace Technology"},{"subitem_text_language":"en","subitem_text_value":"Japan Aerospace Exploration Agency Computational Science Research Group, Institute of Aerospace Technology"},{"subitem_text_language":"en","subitem_text_value":"Japan Aerospace Exploration Agency Operation and Safety Technology Team, Aviation Program Group"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Yang, Choongmo"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"青山, 剛史"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"齊藤, 茂"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yang, Choongmo","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Aoyama, Takashi","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Saito, Shigeru","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-01-15"}],"displaytype":"detail","filename":"63803000.pdf","filesize":[{"value":"2.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"63803000.pdf","url":"https://jaxa.repo.nii.ac.jp/record/2154/files/63803000.pdf"},"version_id":"9baae925-233b-4ae0-8777-634e1d869d01"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"ヘリコプタ","subitem_subject_scheme":"Other"},{"subitem_subject":"翼渦干渉","subitem_subject_scheme":"Other"},{"subitem_subject":"BVI騒音","subitem_subject_scheme":"Other"},{"subitem_subject":"3次元モデル","subitem_subject_scheme":"Other"},{"subitem_subject":"アクティブフラップ","subitem_subject_scheme":"Other"},{"subitem_subject":"計算流体力学","subitem_subject_scheme":"Other"},{"subitem_subject":"回転翼","subitem_subject_scheme":"Other"},{"subitem_subject":"位相角","subitem_subject_scheme":"Other"},{"subitem_subject":"空力騒音","subitem_subject_scheme":"Other"},{"subitem_subject":"音圧","subitem_subject_scheme":"Other"},{"subitem_subject":"helicopter","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"blade-vortex interaction","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"BVI noise","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"three dimensional model","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"active flap","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"computational fluid dynamics","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"rotary wing","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"phase angle","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"aerodynamic noise","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"sound pressure","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"technical report","resourceuri":"http://purl.org/coar/resource_type/c_18gh"}]},"item_title":"ヘリコプタの騒音を低減するアクティブ・フラップの数値解析","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"ヘリコプタの騒音を低減するアクティブ・フラップの数値解析"}]},"item_type_id":"3","owner":"1","path":["180","1893"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"2154","relation_version_is_last":true,"title":["ヘリコプタの騒音を低減するアクティブ・フラップの数値解析"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T09:27:43.935682+00:00"}