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Unit-1.Aircraft basics with history of aircraft
- 1. OE: Aircraft Electronicsand Systems UEC632N Presented by: Dr. Vijaylakshmi Jigajinni ECE Dept. BEC Bagalkote
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- 22. Anaircraftconsistsof (i)mainframe—fuselageto carrypassengersor payloads, (ii)wingstoprovideliftingforceto overcome weightof the aircraft, (iii)propulsion system ( jetengineorturboprop or propeller engine)and (iv)sophisticatedavionicssystem includinginstrumentationsystem, navigationsystems, communicationsystems and warningsystems. Modern avionicssuite includesmany digitalcomputers to increasesafety, reducepilot workloadandenhance reliability.
- 40. Control Surfaces • Theprimary control surfaces are shown in Fig. and these control the pitch, roll and yaw of the aircraft.
- 41. • The secondarycontrol surfaces include air brakes spoilers, trims for roll, pitch and yaw, as shown in Fig.
- 42. Forces, Moments andAngle of Attack (AOA)
- 43. There are twocoordinate systems: (i) First coordinate system—inertial coordinate system is fixed to the earth and is used for aircraft motion analysis, with respect to earth. (ii) Second coordinate system—body coordinate system is fixed to the moving aircraft.
- 44. Coordinate System ThreeForces The aircraft experiences longitudinal force, lateral force and vertical (normal) force. Likewise, there are three moments: 1. Pitching moment about lateral axis, 2. Rolling moment about longitudinal axis, and 3. Yawing moment about vertical axis.
- 45. Angle of Attack(AOA) Angle of attack (AOA, α Greek letter alpha) is the angle between the chord line of an aerofoil and the vector representing the relative motion of aerofoil and the surrounding air.
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- 47. • High AoAin fighter aircraft give an agility to evade missile hits • Indian-Russian fighter aircraft has highest AoA of 123 degree of 3 sec • AoA has increased from 20 to 45 degree even to 90 degree High Alpha
- 50. Engines • Modern jetliners have 2, 3 or even 4 turbo fan • Engine perform unprecedented reliability, so that failures are rare • Turbo engines are more propular
- 54. Avionics • Modern aircraftincludes state of art instrumentation, navigation, communication and warning systems • 3 warning systems – Stall warning systems – Ground proximity warning system – Traffic collision avoidance system
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Editor's Notes
- #43 In order to deal with the motion of an aircraft, it is essential to define a suitable coordinate system
- #48 Tha manoeuvre is called pugachev’s cobra manouvre i.E wing perpendicular to the direction od motion Boeing 777 and airbys 330 Aoa is less
- #55 Induction of these system reduce accidents, earlier it was 2 per month