著者

北村 圭一 葛生 和人 入門 朋子 野中 聡 藤本 圭一郎 福添 森康 嶋 英志

出版者

一般社団法人 日本航空宇宙学会

雑誌

航空宇宙技術 (ISSN:18840477)

巻号頁・発行日

vol.10, pp.43-50, 2011 (Released:2011-06-14)

参考文献数

23

被引用文献数

3 3

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The Epsilon Launch Vehicle, scheduled to be launched in 2013, is currently under the development by JAXA (Japan Aerospace Exploration Agency). In this study, aerodynamic characteristics of the Epsilon Launch Vehicle are investigated by conducting both wind tunnel tests and numerical analyses at Mach 0.7. In order to examine accuracy of the measured drag, we probed the cavity pressure in addition to the base pressure, in contrast to our earlier work for Mach 1.5. The measured data indicated that the cavity pressure can be substituted by the base pressure or the static pressure within 3% error, which accounts for 1% error in the fore drag estimation. Then, the fore drag, calculated based on the static pressure, was used for CFD validation. Our CFD results of attack angles of 0 and 5 degrees showed fair agreement with the wind tunnel results, including the surface flow pattern, the fore drag and the normal force. Finally, aerodynamic characteristics of Epsilon Launch Vehicle at Mach 0.7 are extracted from the CFD results: 1) contribution to total forces was clarified for each part (e.g., flanges and attitude control units), 2) the normal force profile at Mach 0.7 showed comparable peaks with the Mach 1.5 case, in spite of the smaller separation regions near protuberant parts, and 3) the Reynolds number effect turned out to be minor within the range of the wind-tunnel and flight conditions.

著者

葛生 和人 平野 靖 間瀬 健二 渡邉 豊英

出版者

一般社団法人情報処理学会

雑誌

情報処理学会研究報告マルチメディア通信と分散処理(DPS) (ISSN:09196072)

巻号頁・発行日

vol.2008, no.21, pp.7-12, 2008-03-06

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ドメイン構成を用いずに,いずれの共有端末からも個別のユーザ環境を再構築できるシステムを開発した.本システムでは,ドメインサーバを介さずに LDAP 上で管理される既存のユーザディレクトリ情報にアクセスし,PKI アプリを搭載した IC カードと連携して共有端末へのログオン認証が行われる.なお,ユーザ環境の再構築に必要なユーザプロファイル情報は,ssh サーバを通して共有のデータストレージ上に格納される.また,共有端末からネットワークドライブとして接続した Samba ファイルサーバ上に,ユーザプロファイル関連フォルダを置くことで,通常はドメイン構成上ではじめて成り立つ移動ユーザプロファイル機能を,ドメインサーバの導入の必要なく実現することができた.本システムは,管理運用面と経済性の両面において有利なソリューションであるといえよう.We developed newly the logon authentication system which can rebuild the individual environment on a shared terminal without depending on domain accounts. In this system, the logon authentication to the terminal is carried out using both a PKI application on smart card and the user directory information of LDAP, and the system does not need a domain control server. The user profile data, which is required for rebuilding of user environments, is stored on shared data storage through a ssh server. On the other hand, the concept of roaming user profile not belonging to a domain is realized through putting user profile folders on Samba file server connected to a shared terminal as a network drive. This system can be regarded as advantageous solution from the points of both user management and economical efficiency.