第53回流体力学講演会/第39回航空宇宙数値シミュレーション技術シンポジウム (2021年6月30日-7月2日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議)

The 53rd Fluid Dynamics Conference / the 39th Aerospace Numerical Simulation Symposium (June 30 - July 2, 2021. The Japan Society for Aeronautical and Space Sciences : Japan Aerospace Exploration Agency (JAXA), Online meeting)

Low noise design concepts have been applied to regional jet two-wheel main landing gear to reduce airframe noise during landing approach. Those concepts were initially developed for the main landing gear of the JAXA's experimental aircraft, ''Hisho,'' based on the Cessna Citation Sovereign, and were tailored to the two-wheel main landing gear after a careful investigation of flow fields around it with computational fluid dynamics simulations, far-field noise measurements with a 10%- scale wind tunnel model and an evaluation of the structural feasibility. The initial design was then improved upon by further investigations with a 20%-scale wind tunnel model and additional computational simulations. Six types of low noise devices were prepared: a porous cover around the tire axle and the lower half part of the strut, a plate between the mid door and strut, a porous plate on the side brace, wheel holes sealed with aluminum tape, a door arm with porous plates. Significant noise reduction, 5.5 dB(A) in overall sound pressure level at a position directly below the main landing gear and 4.5 EPNdB, was achieved.

著者名の誤記: TKAISHI,Takehisa

形態: カラー図版あり

The clerical error of an author's name: TKAISHI,Takehisa

Physical characteristics: Original contains color illustrations

資料番号: AA2130027010

レポート番号: JAXA-SP-21-008