{"created":"2023-06-20T15:16:11.375417+00:00","id":46299,"links":{},"metadata":{"_buckets":{"deposit":"0017d76b-0586-4210-ae7f-78a7ee88e8f9"},"_deposit":{"created_by":1,"id":"46299","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"46299"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00046299","sets":["1887:1893","9:1090:1091:2025"]},"author_link":["513719","513694","513724","513681","513704","513692","513708","513721","513707","513685","513706","513702","513711","513683","513687","513726","513689","513727","513701","513717","513718","513686","513684","513720","513705","513713","513696","513710","513691","513723","513688","513700","513678","513679","513698","513680","513699","513715","513690","513703","513712","513697","513722","513714","513716","513725","513693","513709","513695","513682"],"item_16_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"D-SEND#2 Flight Test Report"}]},"item_16_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2020-02-28","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"104","bibliographicPageStart":"1","bibliographicVolumeNumber":"JAXA-RM-19-008","bibliographic_titles":[{"bibliographic_title":"宇宙航空研究開発機構研究開発資料"},{"bibliographic_title":"JAXA Research and Development Memorandum","bibliographic_titleLang":"en"}]}]},"item_16_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"D-SENDプロジェクトは，成層圏まで上昇させた気球から供試体を自由落下させ，超音速飛行中のソニックブームを陸上及び地上約1kmまでの数ヶ所の空中で計測するもので，D-SEND#1試験とD-SEND#2試験の2 つのステップから構成される．その第2 ステップであるD-SEND#2試験の第1 回飛行試験は，スウェーデンのEsrange実験場で2013年8月に実施されたが飛行異常を発生し，所望の低ソニックブーム波形を計測することができなかった. その後, 原因分析と必要な対策を講じて2014年8月に再試験を目指したが，気象条件が整わず未実施に終わった. この教訓を生かし，新たな対策として試験期間の増加と準備段階の工夫等を行うことを前提に再度の試験が認められ, 2015年7月に第2回飛行試験を実施し，無事に成功するに至った.本飛行試験では，JAXAの特許技術を適用して設計された供試体（S3CMと呼称）をソニックブーム計測システム（BMSと呼称）の上空において設計条件で飛行させ，想定される低ソニックブーム波形を計測することで設計概念の実証を図ることを目的とした. 飛行試験で得られた計測されたソニックブームの圧力波形（“計測波形”と呼称）のピークは明らかに低減されていることが確認された. しかしながら, 設計形状から推算されるソニックブームの圧力波形（“推算波形”と呼称）との間に明確な差異が認められたことから, 詳細な分析を行った結果, 大気乱流の影響を受けていることが明らかになった. そこで，大気乱流モデルを取り入れたソニックブーム伝播解析法を新たに構築し，飛行試験結果を再検討した結果，計測波形は推算波形の変形によるものであることが定量的に明確に示された. これを持ってJAXA特許技術である「重心まわりのモーメントを釣り合わせた飛行状態（トリム状態）で先端及び後端のソニックブーム波形を同時に低減可能な設計概念」の飛行実証に世界で初めて成功するに至った．本稿は，このD-SEND#2飛行試験に関する試験計画, 試験の全体システム構成，供試体システムの開発状況，ソニックブーム計測システムの運用方法，実際の試験運用結果，並びに計測結果と技術評価等をまとめたものである．","subitem_description_type":"Abstract"}]},"item_16_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"The objective of the D-SEND#2 flight test was to demonstrate the validity of JAXA’s low sonic boom design concept through the balloon drop technique which was used in the D-SEND#1 tests. Although the first flight test of the D-SEND#2 test vehicle was conducted in the 16th of August, 2013, the test was unfortunately failure. In order to solve the main cause of the failure, JAXA improved the stability and control system of the vehicle by including corrected aerodynamic data. The second flight test was successfully conducted in the 24th of July, 2015, and lots of data of the sonic boom generated by the vehicle were measured with our special microphone system. The remarkable reduction of both front and rear overpressure of the sonic boom measured at the design condition was clearly confirmed. However, the waveform of its pressure distribution (called “pressure signature”) was not precisely similar to the low boom pressure signature estimated on the vehicle which was developed with the JAXA’s low boom design concept. After the detail analysis of its difference, JAXA found out that the main reason was based on the deformation of pressure signature through its propagation within atmospheric turbulence which was recognized to exist around the region from the ground to altitude of 3km. JAXA newly developed a boom propagation tool including the effect of atmospheric turbulence on the propagation of sonic boom, then confirmed that the difference between the measured and estimated pressure signatures was able to be physically explained by the effect of atmospheric turbulence quantitatively as well as qualitatively. This article provides detailed technical information about the plan and preparation outline, some design results of the vehicle system, and principal results of the D-SEND#2 flight test.","subitem_description_type":"Other"}]},"item_16_description_18":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"形態: カラー図版あり","subitem_description_type":"Other"}]},"item_16_description_19":{"attribute_name":"内容記述（英）","attribute_value_mlt":[{"subitem_description":"Physical characteristics: Original contains color illustrations","subitem_description_type":"Other"}]},"item_16_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA1930022000","subitem_description_type":"Other"}]},"item_16_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: JAXA-RM-19-008","subitem_description_type":"Other"}]},"item_16_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.20637/JAXA-RM-19-008/0001","subitem_identifier_reg_type":"JaLC"}]},"item_16_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構(JAXA)"}]},"item_16_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Japan Aerospace Exploration Agency 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飛行試験報告書"],"weko_creator_id":"1","weko_shared_id":1},"updated":"2023-06-20T20:03:17.459565+00:00"}