翻訳と辞書 Words near each other ・ Aerolíneas de El Salvador ・ Aerodrom Municipality, Macedonia ・ Aerodrom, Kragujevac ・ Aerodrome ・ Aerodrome (disambiguation) ・ Aerodrome Abbeville ・ Aerodrome beacon ・ Aerodrome Inc. ・ Aerodrome mapping database ・ Aerodromnaya Hill ・ Aerodrone ・ Aerodynamic (disambiguation) ・ Aerodynamic (instrumental) ・ Aerodynamic aerosol classifier ・ Aerodynamic and Propulsion Test Unit (Arnold AFB, TN) ・ Aerodynamic center ・ Aerodynamic drag ・ Aerodynamic force ・ Aerodynamic Forms in Space ・ Aerodynamic heating ・ Aerodynamic levitation ・ Aerodynamic Mudflap ・ Aerodynamic Park ・ Aerodynamic potential-flow code ・ Aerodynamically Alleviated Marine Vehicle ・ Aerodynamics ・ Aerodynamics of Gender ・ Aerodynamik/La Forme Remixes ・ Aerodyne ・ Aerodyne Systems Vector Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Aerodynamic center ： ウィキペディア英語版 Aerodynamic center The torques or moments acting on an airfoil moving through a fluid can be accounted for by the net lift applied at some point on the airfoil, and a separate net pitching moment about that point whose magnitude varies with the choice of where the lift is chosen to be applied. The aerodynamic center is the point at which the pitching moment coefficient for the airfoil does not vary with lift coefficient (i.e. angle of attack), so this choice makes analysis simpler . :$=0$ where $C\_L$ is the aircraft lift coefficient. In other words, the aerodynamic center is the point on the airfoil where the incremental lift (due to change in Angle of Attack) will act. And, since the lift force generated due to change of angle of attack passes through this point, the moment generated about this point will be zero. The concept of the aerodynamic center (AC) is important in aerodynamics. It is fundamental in the science of stability of aircraft in flight. For symmetric airfoils in subsonic flight the aerodynamic center is located approximately 25% of the chord from the leading edge of the airfoil. This point is described as the quarter-chord point. This result also holds true for 'thin-airfoils'. For non-symmetric (cambered) airfoils the quarter-chord is only an approximation for the aerodynamic center. A similar concept is that of center of pressure. The location of the center of pressure varies with changes of lift coefficient and angle of attack. This makes the center of pressure unsuitable for use in analysis of longitudinal static stability. Read about movement of centre of pressure. == Role of aerodynamic center in aircraft stability == For longitudinal static stability:     and    $>0$ For directional static stability:   $>0$     and    $>0$ Where: :$C\_z\; =\; C\_L\; \backslash cos(\backslash alpha)\; +\; C\_d\; \backslash sin(\backslash alpha)$ :$C\_x\; =\; C\_L\; \backslash sin(\backslash alpha)\; -\; C\_d\; \backslash cos(\backslash alpha)$ For A Force Acting Away at the Aerodynamic Center, which is away from the reference point: :$X\_\; =\; X\_\backslash mathrm\; +\; c$ Which for Small Angles $\backslash cos(\backslash alpha)\; =\; 1$ and $\backslash sin(\backslash alpha)\; =\; \backslash alpha$, $\backslash beta\; =\; 0$, $C\_z=C\_L-C\_d$ *\alpha, $C\_z=C\_L$ simplifies to: :$X\_\; =\; X\_\backslash mathrm\; +\; c$ :$Y\_\; =\; Y\_\backslash mathrm$ :$Z\_\; =\; Z\_\backslash mathrm$ General Case: From the definition of the AC it follows that :$X\_\; =\; X\_\backslash mathrm\; +\; c\; +\; c$ : . :$Y\_\; =\; Y\_\backslash mathrm\; +\; c\; +\; c$ : . :$Z\_\; =\; Z\_\backslash mathrm\; +\; c\; +\; c$ The Static Margin can then be used to quantify the AC: :$SM\; =\; \backslash over\; c\}$ where: :$C\_n$ = yawing moment coefficient :$C\_m$ = pitching moment coefficient :$C\_l$ = rolling moment coefficient :$C\_x$ = X-force ~= Drag :$C\_y$ = Y-force ~= Side Force :$C\_z$ = Z-force ~= Lift :ref = reference point (about which moments were taken) :c = reference length :S = reference area :q = dynamic pressure :$\backslash alpha$ = angle of attack :$\backslash beta$ = sideslip angle SM = Static Margin 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aerodynamic center」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.