aircraft and aerodynamics
TRANSCRIPT
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ARIF AZIZB.Sc. Engg (Mech), BUET.
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TO GIVE YOU A BASIC IDEA ABOUT
AIRCRAFT AND HOW IT FLIES
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DEFINATION OF AIRCRAFT
A HEAVIER THAN AIR FLYING MACHINE,SUPPPORTED BY AEROFOILS, DESIGNEDTO OBTAIN , WHEN DRIVEN THROUGHTHE AIR AT AN ANGLE INCLINED TO THEDIRECTION OF MOTION, A REACTION
FROM THE AIR APPROXIMATELY AT RIGHTANGLES TO THEIR SURFACES
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DIFFERENT PARTS IN ISOMETRIC VIEW
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TYPES OF AIRCRAFT
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FIRST AIRCRAFT OF THE WORLD
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AIR SHIP
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AEROPLANE
LAND PLANE
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AEROPLANE
SEA-PLANE (FLOAT PLANE)AMPHIBIAN
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NON POWER DRIVEN
GLIDER KITES
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HELICOPTER
ROTORCRAFT
HELICOPTER
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THEOREM
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EQUATION OF CONTINUITY
MASS FLOW RATE ALONG A STREAM FILAMENT ISCONSTANT. 1V1A1=2V2A2 IE VA=CONST, ALONG ASTREAM LINE.
STREAM LINE. A STREAMLINE IS AN IMAGINARYLINE DRAWN IN THEFIELD OF FLOW SUCHTHAT THE VELOCITYVECTOR AT ANY POINTON THE LINE IS ALWAYSTANGENTIAL TO THE
LINE. 13
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VENTURI TUBE
VENTURY EFFECT
P1A1V1=P2A2V2
P1=P2A2V2/V1A1
P2=P1V1A1/V2A2
POINT1 POINT2
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HOW LIFT IS PRODUCED?
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PRINCIPLE OF FLIGHT
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FORCES ACT ON AIRCRAFT
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UNBALANCED FORCES
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FLIGHT CONTROLS
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PRIMARY CONTROL SURFACES.
AILERON.
ELEVATOR. RUDDER.
SECONDARY CONTROL SURFACES.
SLAT (AUXILIARY AEROFOIL). FLAP.
AIR BRAKE.
AIRCRAFT CONTROLS
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FUNDAMENTAL FLIGHT CONTROL
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AIRCRAFT CONTROLS
AN AIRCRAFT HAS THREE AXIS ; LONGITUDINAL, LATERALAND NORMAL AXIS. THREE SEPARATE MOVEMENTS AREPERFORMED WITH THE HELP OF THREE CONTROL
SURFACES ABOUT THESE THREE AXIS.A. ELEVATOR FOR CONTROL IN PITCH (ABOUTLATERAL AXIS).
B. AILERONS FOR CONTROL IN ROLL (ABOUT
LONGITUDINAL AXIS).
C.RUDDER FOR CONTROL IN YAW (ABOUT NORMAL AXIS).
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AIRCRAFT CONTROLS
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TAKE OFF
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SEGMENTS OF TAKE OFF
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http://www.globalsecurity.org/military/systems/aircraft/images/Takeoff1big.JPG -
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TAKE OFF
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HIGH SPEED FLIGHT30
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ML
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WAVE PROPAGATION
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WAVE PROPAGATION
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WAVE PROPAGATION
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SONIC BOOM
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SONIC BOOM
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SHOCK WAVE
Normal Shock Wave : High Subsonic Flight
Oblique Shock Wave : Transonic & Supersonic Flight
Expansion Waves : Supersonic Flight
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GLOBAL POSITIONING SYSTEM
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GLOBAL POSITIONING
SYSTEM
A TYPICAL GPS RECEIVER
CALCULATES ITS POSITION
USING THE SIGNALS FROMFOUR OR MORE GPS
SATELLITES. FOUR SATELLITES
ARE NEEDED SINCE THE
PROCESS NEEDS A VERY
ACCURATE LOCAL TIME, MORE
ACCURATE THAN A CLOCK CAN
PROVIDE, SO THE RECEIVER
INTERNALLY SOLVES FOR TIME
AS WELL AS POSITION.
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Worldwide radio-navigation system
Calculate positions in latitude - longitude
coordinates (x,y,z 3D format)
Advantages of satellite based system
Coverage Independence from weather
Highly accurate time and positional data
Unlimited users
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6 Orbital Planes
600 apart each in longitude
550 inclined to the equator
3 satellites each orbit
1200 apart
18 are Primary Satellite
3 satellite are spare on
orbit
24 Satellites23 41
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Satellites circle the earth twice a day
3D coordinate (x,y,z) information
Triangulation method.
X
Y
Z
X,Y,Z
3 Dimensional Coordinate
World Geodetic System
- WGS84.
Three satellites to calculatea 2D position (latitude &
longitude)
Four or more satellites to calculate 3D position (latitude,
longitude and altitude)16 42
http://en.wikipedia.org/wiki/World_Geodetic_Systemhttp://en.wikipedia.org/wiki/WGS84http://en.wikipedia.org/wiki/WGS84http://en.wikipedia.org/wiki/WGS84http://en.wikipedia.org/wiki/World_Geodetic_Systemhttp://en.wikipedia.org/wiki/World_Geodetic_Systemhttp://en.wikipedia.org/wiki/World_Geodetic_Systemhttp://en.wikipedia.org/wiki/World_Geodetic_Systemhttp://en.wikipedia.org/wiki/World_Geodetic_System -
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LatitudeLongitude
Latitude
Longitude
Altitude
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BLACK BOX
USED TO RECORD AIRCRAFTSPECIFIC PERFORMANCEPARAMETERS
USED AS AN AID ININVESTIGATING AIRCRAFTMISHAPS
USUALLY PAINTED BRIGHTORANGE AND GENERALLY
LOCATED IN THE TAILSECTION OF THE AIRCRAFT.
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EJECTION SYSTEM
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EJECTION
MB EJECTION SEAT99.98% RELIABLE
MIN HEIRH: 0 ft
MAX HEIGHT: 50000 ft
MIN SPEED: 0 kph
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EJECTION
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MISSILES & ROCKETS
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MISSILES AND ROCKETS
RECEIVE AND MODULATE THE IRRADIATION ENERGY FROM THETARGET, MEASURING THE TARGET
POSITION INFORMATION ANDTRANSFORM IT TO AN ELECTRICALSIGNAL
SEARCH AND TRACK THE TARGET
CO-ORDINATE REFERENCE SIGNALAND OFF-BORESIGHT ANGLESIGNAL
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ESCAPING FROMMISSILE ATTACK
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STEATH TECHNOLOGY
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STEATH TECHNOLOGY
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HOW TO ACHIVE
REFLECT THE RUDDER SIGNAL IN DIFFERENT
DIRECTION
USING SPECIAL PAINT WHICH ABSORB RUDDERSIGNAL
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OBJECTIVE OF STEATH TECHNOLOGY
TO AVOID ENEMY RADAR
TO ATTACK ENEMY WITHOUT GIVINGREACTON TIME
TO CREATE SURPRISE FOR THE ENEMY
TO ACQUIRE PINPOINT ACCURACY
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APPLICATION OF RADAR BEAM ONA STEALTH SHAPED OBJECT
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LANDING
LANDING SPEED:280-300 kph
MAX LANDING SPEED:360 kph
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LANDING
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QUESTIONS & ANSWER
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THANK YOU