african hawk 2 part 1
TRANSCRIPT
African Hawk II Automated Version
Graduation Project
Done By:
Mamdouh Sadek Al- Moatasem BelaaH
Samy Samir Khattab
Introduction
Introduction
• Mini UAVs
• Pheonix 607 (2006/2007)
• Mantis (2007/2009)
• Buraq (2008/2009)
• African Hawk (2009/2010)
Introduction
• It’s a Vision
• UAS
• Autopilot
Introduction
Objectives
• Modeling and Manufacturing of the aircraft.
• Design and installation of autopilot chip onboard of the aircraft.
Introduction
What’s New?!
• Internal Arrangement
• Landing Gear
• Vacuum Bagging
• MicroPilot Autopilot
• Emergency Recovery System
Propulsion Model
Objective
• Set Mathematical to relate parameters
• Thrust
• RPM
• Velocity
Experimental Test
• Relation between throttle position, Thrust and RPM
Measuring Thrust
Measuring RPM
Results
1- Thrust Vs. Throttle Position
y = 0.209x2 + 18.981x
R² = 0.9939
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 20 40 60 80 100 120
thru
st(g
m)
throttle position (%)
2- RPM Vs. Throttle Position
y = -0.3269x2 + 121.4x
R² = 0.9887
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
0 20 40 60 80 100 120
RP
M
Throttle Position (%)
3-Thrust Vs. RPM
y = 2.5148x R² = 0.8367
0
2000
4000
6000
8000
10000
12000
0 500 1000 1500 2000 2500 3000 3500 4000 4500
rpm
THRUST(gm)
4-Endurance Vs. Throttle Position
y = 103681x-2.112 R² = 0.9964
0
20
40
60
80
100
120
140
0 20 40 60 80 100 120
End
ura
nce
- m
in
Throttle position (%)
5Thrust Vs. airplane Velocity
• BEM Theory
• CL and CD
• No geometry for blades
• 3D Scanning
• 2D Sections
Geometric Model
What’s New ?!
• Nothing Changed in the external geometry
• Some internal parts were edited
• Some new internal parts were added
Wing
Wing Ribs
Servo Motors Flap Servo
Servos Slim Servo
Fuselage
Fuselage
Fuselage Frame
Fuselage Battery Lower Holder
Fuselage Battery Upper Holder
Landing Gear Housing
Landing Gear Housing
Landing Gear Housing
Mass Model
Mass Model
• Objective:
Center of Gravity of the aircraft is related to the stability condition of the aircraft.
Moment of inertias will be needed for the calculation of the stability derivatives.
Mass Model
• Two methods of calculations:
The first method (using CAD software)
The second technique (Manual calculations)
Mass Model
• Firstly we will define the Axis system we used:
We took the center of the general Axis at the leading edge of the airfoil cross section of the wing’s root.
The +ve Z direction is upward,
the +ve Y direction is in the right wing direction from the front view,
the +ve X direction is in the direction of the fuselage rear.
Mass Model
• The aircraft is divided into 3 main sections of components:
Structural Components.
Propulsion Components.
Control Components.
Mass Model
Results
Aerodynamic model
•Cl-alfa curve
-2 0 2 4 6 8 10 12 14 16-0.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4cl-alfa
alfa
cl
wing only
airplane
Aerodynamic Model
Drag polar
0 0.01 0.02 0.03 0.04 0.05 0.06 0.07-0.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4 cl-cd , drag polar
cd
cl
wing only
airplane
Cm-alfa
-2 0 2 4 6 8 10 12 14 16-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06cm-alfa
alfa
cm
wing only
airplane
Manufacturing
Master Mold
Manufacturing Steps
• Laser cutting and structure assembly
• Balsa Surface fabrication
• Composite Surface fabrication
• Surface finish
Ribs Fabricating & arrangement
• Plywood, 27 ribs.
Balsa Surface fabrication
•1.5 mm Balsa wood sheet covering
Balsa Surface fabrication
Composite Surface fabrication
• First layer: fiber glass 200 gm/m2
• Other layers fiber glass 400 gm/m3
• Lower Surface
• Painting
Master Mold
Female Mold
• Foam Jigs
• Wood Lips
Female Mold
• Gaps are sealed with clay
• Surface is waxed at least two times
Female Mold
• Applying Epoxy Resin
• Start from root
• Brush in one direction
Female Mold
• Six layers
• Around 30 min between each layer
• Most reusable part
Manufacturing
Vacuum Bagging
Manufacturing Skin Using Vacuum Bagging Technique
• What is vacuum Bagging ?!
a new technique used in composite manufacturing that used the
pressure as a clamping force to press the fiber laminates together with the mold until the resin is cured.
Vacuum Bagging
Vacuum Bagging
• Light weight Product
vacuum bagging results in absorbing of excessive resin in the breather
material and can reduce Epoxy resin weight by 30% and total weight by 15%
•Better uniformity of lay up (No thick / thin cross sections)
• exact shaping
vacuum Bagging lay up results in perfect shape that exactly like the
female mold shape due to clamping force between mold and laminate.
•Strong bonding between layers
Vacuum Bagging Layers
• Carbon fiber
• Release Fabric
• Perforated film
• Breather /bleeder
• Bag
Vacuum Bagging Equipment
1-Vacuum Pump
2-Gauge
3-hose & Regulator
Vacuum Bagging
Easy lock
Vacuum Bagging
Tubing Clamps
Vacuum Bagging
Vacuum Port
Final Shape
Manufacturing procedures •1-Cutting carbon fiber cloth
•2-Cutting vacuum bagging layers
• 3. Preparation of bag and vacuum bagging equipment
• 4. Female mold preparation
• 5-Mixing Epoxy resin
• 6. Applying epoxy on the laminate
• 7. Applying vacuum bagging layers
•8. Mold Entrance in the bag & sealing the open side
•9. Opening vacuum pump
• 10. Removing skin from the mold
• fuselage
Internal structure
Control surfaces cutting control surfaces
Control Surfaces
Balsa Leading Edges
Control Surfaces
Covering
TO BE CONTINUED………….