无人机专业英语 课件 unit3 flight dynamics of uav.pptx

无人机专业英语

Unit3FlightDynamicsofUAV

1FlightDynamicsofUAVControlSurfaces23.13.2CONTENT

3.1FlightDynamicsofUAVNormalAxisofAircraft3.1.1 AxisandRotationThethreecriticalflightdynamicsparametersoffixed-wingdronearetheanglesofrotationinthreedimensions.Thecenterpointiscalledcenterofgravity(COG),beingtheoriginofthreeaxesinthemeantime.Threeaxesarenormalaxis,longitudinalaxis,andlateralaxis.Rotationsinthreedimensionsareyaw,roll,andpitch,respectively.MovementofYaw

3.1FlightDynamicsofUAVLongitudinalAxisofAircraft3.1.1 AxisandRotationRollistherotationaboutthelongitudinalaxis,positivewiththestarboardwingdown.MovementofRoll

3.1FlightDynamicsofUAVLateralAxisofAircraft3.1.1 AxisandRotationPitchistherotationaboutthelateralaxis,positivewithnoseup.MovementofPitch

3.1FlightDynamicsofUAVAerodynamicForcesonanAircraft3.1.2 AerodynamicForcesAerodynamicforcesarehighlydependentontheinteractionoftheatmospheremoleculeswiththeaircraftsurface,andspecificallyonthemolecules’densityandvelocity.Herethevelocityreferstotherelativevelocitybetweenatmosphereandaircraft.

3.1FlightDynamicsofUAVAirfoil3.1.3 AirfoilAcross section of a typical airplane wing shows the topsurface tobemorecurvedthanthebottomsurface.Thisshapedprofileiscalledan“airfoil”andtheshapeexistsbecauseithaslongbeenproven(sincethedawnofflight)thatanairfoilgeneratessignificantlymoreliftthanopposingdrag.

3.1FlightDynamicsofUAVTheGenerationofLift3.1.3 TheGenerationofLiftThefasterawingmovesthroughtheair,themoretheactionsareexaggeratedandthemoreliftisgenerated.Conversely,aslowermovingwinggenerallycreateslesslift.Theliftequalstohalfofthedensitytimesthesquareofvelocitytimeswingareatimesliftindex.

3.2ControlSurfacesForaairplanetoflyinacontrolledmanner,controlsurfaceareneces