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title2次元波動ベース法による音響透過及び伝播解析に関する研究
Other TitleStudy on Steady-State Sound Transmission and Propagation Analysis Using the Two-Dimensional Wave Based Method
Author(jpn)高橋, 孝; 金田, 英和; 村上, 桂一; 橋本, 敦; 青山, 剛史; 古賀, 豊; 宮, 信大; カリル, モハメド; 森, 浩一; 中村, 佳朗
Author(eng)Takahashi, Takashi; Kaneda, Hidekazu; Murakami, Keiichi; Hashimoto, Atsushi; Aoyama, Takashi; KOGA, Yutaka; MIYA, Nobuhiro; Khalil, Mohammed; Mori, Koichi; Nakamura, Yoshiaki
Author Affiliation(jpn)宇宙航空研究開発機構研究開発本部数値解析グループ; 計算力学研究センター; 宇宙航空研究開発機構研究開発本部数値解析グループ; 宇宙航空研究開発機構研究開発本部数値解析グループ; 宇宙航空研究開発機構研究開発本部数値解析グループ; 名古屋大学大学院工学研究科航空宇宙工学専攻; 名古屋大学大学院工学研究科航空宇宙工学専攻; カイロ大学; 名古屋大学大学院工学研究科航空宇宙工学専攻; 名古屋大学大学院工学研究科航空宇宙工学専攻
Author Affiliation(eng)Numerical Analysis Group, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA); Research Center of Computational Mechanics Inc.; Numerical Analysis Group, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA); Numerical Analysis Group, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA); Numerical Analysis Group, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA); Department of Aerospace Engineering, Graduate School of Engineering, Nagoya University; Department of Aerospace Engineering, Graduate School of Engineering, Nagoya University; Cairo University; Department of Aerospace Engineering, Graduate School of Engineering, Nagoya University; Department of Aerospace Engineering, Graduate School of Engineering, Nagoya University
Issue Date2010-03-31
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構
Publication titleJAXA reseach and development report
宇宙航空研究開発機構研究開発報告
VolumeJAXA-RR-09-008
Publication date2010-03-31
Languagejpn
eng
AbstractAcoustic environment at a launch site is affected by jets from rocket engines, as well as by geometric features of a launch pad. Then, spacecraft are also exposed to acoustic pressure with the wide frequency range transmitted through a payload fairing. In the case that vibro-acoustic response is predicted using steady-state vibroacoustic analysis, there actually exists the mid-frequency range in which there are no mature numerical methods. This report deals with the novel Wave Based Method (WBM), a deterministic approach for steady-state vibroacoustic analysis in the wide frequency range. Then the two-dimensional (2D) WBM code developed by the authors is applied to some sound transmission problems and exterior problems. In the sound transmission analysis, it is found that discontinuous impedance boundary conditions (BCs) must be fi tted by using continuous functions to obtain more accurate results using both WBM and FEM. After smoothing the BCs, numerical prediction results of our sound transmission models by the 2D WBM and FEM are compared, and the 2D WBM are verified. Furthermore, in order to verify the 2D code extended for the exterior problems, it is applied to simple launch pad models. In both propagation and transmission problems, it can be stated that the WBM has quite high potential to be applied in the higher frequency range.
著者らは,定常音響構造連成解析において,従来の手法では解析が困難な中間周波数帯を解析可能な決定論的手法である波動ベース法(WBM)に着目し,フェアリング内部の宇宙機の2 次元内部定常音響振動連成解析を行ってきた.本報告では,著者らが開発し拡張した2 次元解析コードを用いて,内部音響透過問題と,解析領域の広い外部音響伝播問題に対するWBM の適用性を検討した結果を示す.音響透過問題に関しては,単純な弾性板を通じた音響透過損失の計算を行い,有限要素法(FEM) による解析結果と比較することによってWBM の解析精度の検証を行った.その際,WBM とFEM の両者に対して,弾性板の端部における不連続な境界条件に付随して解析精度が悪化する問題を指摘し,簡易的な手法で問題を回避する方法を提案した.一方,外部問題においては,ロケット打ち上げ時の射場の定常音響伝播の計算を行い,無限遠において音が反射しないことを保証する放射条件を厳密に満足して,広い解析領域および広い周波数領域における問題を扱うことができることを示した.
DescriptionOriginal contains color illustrations
形態: カラー図版あり
Keywordscoupled vibroacoustic analysis, sound transmission, sound propagation, wave based method
Document TypeTechnical Report
JAXA Category研究開発報告
ISSN1349-1113
NCIDAA1192675X
SHI-NOAA0064697000
Report NoJAXA-RR-09-008
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/15741


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