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بسم الثه الرحمن الرحيم
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MAIN ELEMENTS IN AIRCRAFT
5 لوو انم 5 Control
>
Wings Landing gear
Engine mount
Nacelle
Stabilizers
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350
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Airplane
Fuselage Description
Main structure (or body) of the aircraft Wings and tail units are
attached it Houses the crew, passengers, cargo, and power plant.
‘Multi-engine aircraft, the power plants mounted on nacelles.
4
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Major Airplane
Componen
Nacelles are separate units that are similar in design and
to the fuselage.
attached to the wing structure or fuselage.
constructi
Nacelles
soo
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Airplane
Engine Mounts —
Attach power plant to the aircraft single-engine aircraft, they are
‘mounted on the front end or nose of the fuselage.multi-engine
tached to or incorporated into the nacelle
sngine aircraft, are incorporated into the
Ps 1 attached to the fuselage on the sides of the fuselage.
ithe back of the aircraft.
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Airplane
Componeniges
Wings
constitute the main lifting surface of the aircraft while in flight
and are designated as right and left. The right and left sides of
an aircraft are relative to the right- and left-hand sides,
‘respectively, of the
ated in the cockpits ۳ ۵۵٩
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Major Airplane
Components
Stabilizers (or tail surfaces) are airfoils whose primary purpose Is.
to increase aircraft ity. They are mounted at the rear end of the
fuselage and consist
of the fin oF fins and the horizontal stabilizer.
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‘The structures of most flight
vehicles are thin walled structures
(shells)
که ۵عزاموه کاعاعع8*
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wing structure)
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cad
Definitions
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‘A critical load-bearing structure on an.
aircraft. Ifthis structure Is severely
damaged, the aircraft cannot fly.
Structural elements mainly to provide
‘enhanced
jerodynamics. Fairings, for instance, are
found where the wing meets the body or
at various locations on the leading or
trailing edge af the wing.
a
Airplane
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Major Airplane
Components 7
reacts the applied torsion and shear forces transmits
aerodynamic forces to the longitudinal and transverse
Supporting members acts with the longitudinal members in
resisting the applied bending and axial loads acts with the
‘members in reacting the hoop, or circumferential 2
hen the structure is pressurized. 14
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Major Airplane
Components
stringers
5
‘resist bending and axial loads along with the skin
‘divide the skin into small panels and thereby increase its
buckling and failing stresses
‘act with the skin in resisting axial loads caused by
essurization.
كد 01
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Major Airplane
Components
ee Asis is a form of construction in which a number ره
‘of members are joined to form a rigid structure. Many
arly aircraft used the Pratt truss, in which, wooden
ongerons served as the main longitudinal structural
mb
05 مد
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Major Airplane
Components
— ay
_ Monocoque structures;
Unstiffened shells. must be relatively thick to resist bending,
compressive, and torsional loads.Does not use formers, frame
assemblies, or bulkheads to give shape to the fuselageThe
biggest challenge: maintaining enough strength while keeping
within allowable limits, ۳ ۵ ری
ight within 1 1
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Major Airplane
Components
cot hE EU Ge,
to diffuse concentrated loads into the cover.
‘More efficient type of construction that permits much thinner
covering shel
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25
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200
Major Airplane
Components
Structural integration of the wing and fuselage
*Keep the wing in its aerodynamic profile
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Major Airplane
Components
resist bending and axial loads
form the wing box for stable torsion resistance
ol > OG
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Airplane
Components
Structure & Fuel Volume
Front Spar & Rear spar (Wing box) is usually
‘Tank
‘The Space Betw:
Displacement of Fi
25
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Major Airplane
Component:
angle booms Those
skin
{All spanwise bending loads reacted by substantial booms or
ی
2 0
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«9
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front rear
Skat ack spt Pg dap vane
7 dap
5
spar layout
Airbus A319
2 Oo
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Airplane
Components
Fixed landing gear
Fixed landing gear is attached to the airframe so that it Is held in
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۳
Control surface
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200
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<:
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Landing Gear
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Major Airplane
Components
Itis Landing Gear Not Takeoff Gear!
3 To 5 Percent of Aircraft Weight
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Major Airplane
Components
Retractable landing gear is carried partially or completely inside
the airframe structure to reduce drag. When necessary for
landing, the gear is extended by some mechanism. The gear is
Into the airfr takeoff
25
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Retractable landing ge
ناك —
lof 7 Oo
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Major Airplane
Components
2
“Quadra cycle. “inline
Skids.
01 «5
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Major Airplane
Components
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Major Airplane
Components
Centerline landing gear is often found on aircraft such as
sailplanes and gliders. This configuration has one main landing
wheel mounted on the centerline of the fuselage and near the
center of gravity of the aircraft. Small auxiliary wheels or skids
foeated on the nose, tall, and wing tps of these type
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Major Airplane
Components
Quadracycle landing gear normally consists of two nose wheels
and two main wheels. This configuration Is found on some
helicopters and on most float-equipped aircraft that incorporate
retractable wheels in the float design
ago
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Major Airplane
Components
Tricycle layout preferable in vast majority of cases
Interference with sensitive electronic payloads (SAR Radar, etc )
force using retractable landing gears
2d
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Major Airplane
Components
‘Skid-type landing gear is usually reserved for use on helicopters
‘as the normally take off and land vertically and do not require a
landing or take-off run.
۰
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1
landing gear
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Airplane
Components
Tail Dragger
Constant AOA (4-5 Degree)
{ow cost
Pilot visibility is Zero
46
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Major Airplane
Components
‘Takeoff Rotation Problem
‘Same Cost Like Tall Dragger
No Steering Problem
5
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Airplane
Components
2111111118 with Single
ERE n tor heavy high wing military transports with
retraction into fuselage bilsters.
| 43
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Removing L.G.(Arado234)
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Airplane
Design Loads
Vertical loads : dependent on magnitude of touchdown rate.
Longitudinal loads : caused by “spin-up’ and braking loads.
Lateral loads : caused by cross-wind landings and ground
turning.
so
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Nose Gear
Failure
one of the
case
should be
consider
for
structure
design
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Retraction
Dynamics
9 smo
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THANK YOU
Leite ی
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MAHDI RAHNAMA,
00
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