Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

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CHAPTER 12 Airworthiness............................................................................. The airworthiness of an ai ...

374 CHAPTER 12 Airworthiness Fig.12.1 Flight envelope. The curves OA and OF correspond to the stalled condition of the aircraft ...

12.2 Load Factor Determination 375 Table 12.1 Category Load Factorn Normal Semiaerobatic Aerobatic n 1 2.1+24000/(W+10000) 4.5 6 ...

376 CHAPTER 12 Airworthiness componentstoverifydesignestimates.Theproblemofstructuraldeteriorationduetocorrosionandwear maybelar ...

12.2 Load Factor Determination 377 Forsomematerials,suchasmildsteel,thecurve(usuallyknownasanS–Ncurveordiagram)isasymp- totictoa ...

378 CHAPTER 12 Airworthiness flaps are lowered and raised, producing additional load cycles in the flap support structure. Engin ...

CHAPTER 13 Airframe Loads........................................................................... InChapter11,wediscussedinge ...

380 CHAPTER 13 Airframe Loads Fig.13.1 Inertia forces on a rigid mass having a constant angular velocity. Fig.13.2 Inertia force ...

13.1 Aircraft Inertia Loads 381 elementδminadirectionperpendiculartorandintheoppositesensetotheangularacceleration.This inertiaf ...

382 CHAPTER 13 Airframe Loads Example 13.1 Anaircrafthavingatotalweightof45kNlandsonthedeckofanaircraftcarrierandisbroughttorest ...

13.1 Aircraft Inertia Loads 383 LetNandSbetheaxialandshearloadsatthesectionAA,asshowninFig.13.4.Theinertiaload actingattheCGofth ...

384 CHAPTER 13 Airframe Loads wherev 0 isthetouchdownspeed,visthefinalspeed(=0),andsisthelengthofdeckcovered.Then, v^20 =− 2 as ...

13.1 Aircraft Inertia Loads 385 whichgives may=950kN Then ay= 950 m = 950 250 /g =3.8g (i) NowtakingmomentsabouttheCG ICGα− 1200 ...

386 CHAPTER 13 Airframe Loads 13.2 SymmetricManeuverLoads....................................................................... ...

13.2 Symmetric Maneuver Loads 387 Theloadsareinstaticequilibriumsincetheaircraftisinasteady,unaccelerated,levelflightcondition. ...

388 CHAPTER 13 Airframe Loads required to balance the aircraft weight, the aircraft experiences an upward acceleration normal to ...

13.2 Symmetric Maneuver Loads 389 levelflightcase.TheenginethrustTisnolongerdirectlyrelatedtothedragD,asthelatterchanges during ...

390 CHAPTER 13 Airframe Loads Asafirstapproximation,weneglectthetailloadP.Therefore,fromEq.(13.12),sinceT=0,we have L≈nW (i) Hen ...

13.3 Normal Accelerations Associated with Various Types of Maneuver 391 13.3 NormalAccelerationsAssociatedwithVariousTypesofMane ...