order of presentation david – intro and fall review matt – testing and summary of changes josiah...

Order of PresentationDavid – Intro and Fall ReviewMatt – Testing and Summary of ChangesJosiah – Details on New DesignJosh – Electrical HardwareOna – Electrical Software / OptimizationTJ – Progress Summary / Future Work

Outline Summary – Fall (David)

Review of Competition (missions, specs, etc.) Old Design

Progress Report New Design (Josiah) Testing (Matt)

Static thrust Endurance Various propellers / throttle settings conclusions

Payload Configuration (Matt) New Dimensions (Josiah) Bulkhead Skeleton (Josiah) Landing Gear (Josiah) Wing Attachment (Josiah) Electronics Configuration (Josh/Ona)

Block Diagram (side-by-side) Mission Model (flow chart) (Matt) HPMI (Matt)

Future Work (TJ) Fabrication

testing CFD Finalize Mission Model

Project OverviewDevelop a UAV which will satisfy the AIAA Design/Build/Fly

Competition mission profile.Competition Details

Location: Tucson, AZDate: April 15-17, 2011

Major requirements:Hand launchedFixed wingElectric powered (NiCad or NiMH batteries)Propeller drivenMust be contain within a carry on bagMax propulsion battery of ¾ lbs.Max current draw of 20 amps

Mission Profile

Mission 1: Dash to Critical Target•4 minutes without payload to fly around course•Scoring equation:

Mission 2: Ammo Re-supply•Steel bar payload completing 3 laps around course•Scoring equation:

Mission 3: Medical supply Mission•Golf balls payload completing 3 laps around course•Scoring equation:

Fall Semester Final Design

Side

Top

New Design

Testing – Complete Setup

Testing – Propulsion System

Testing – Data Logger Interface

TestingManufacturer Motor Specifications

Max Static Thrust: 42.4 oz (2.65 lb.)Able to propel 5 lb. aircraft

Static ThrustGLX Force Sensor

Various Propellers / Throttle SettingsGraph (12x8, 9x7.5, etc)

ConclusionsThrust may be insufficient for hand launch at initial

desired weight of 5lbsNeed to reduce the size and weight of systemDon’t want to increase battery size / weightMotor is already best option

Payload Configuration

Reduced to two rows side by side

Less required storage space

Less required structure

New Dimensions

Smaller DesignLighterLess dragLess energy consumption

Old DesignNew Design

4.5”3”

30”23”

Bulkhead SelectionProvides stiffness,

toughness, and ease of fabrication

Carbon fiber/Balsa Wood

Joined via thin circular CFRP tie rods

Landing Platform – Friction Contact

AdvantagesErgonomic hand

launchLess drag

DisadvantagesHigher potential for

damagePropeller

interference with ground

Landing PlatformRequirements

Leading ground contacts must be low friction

Rear contact must be high friction

All contact materials must be abrasion resistant

Our approachCarbon Fiber/Kevlar

hybrid compositeTeflon/low friction

coating for front ground contacts

Low Friction Ground Contacts

High Friction Ground Contact

Wing Connections – Friction FitSlides tightly into

positionQuick and easy

assemblyLight weightFew components to

break

Mission Model

1) Hand Launch (100%)

2) Acceleration (100%)

3) Turn 1 (90%)

4) Cruise (75%)

5) 360 Degree Loop (90%)

6) Cruise (75%)

7) Turn 2 (90%)

8) Landing (50%)

#) Phase (Throttle Setting)

Electronics - Hardware Propulsion Batteries: Elite

1500 mAh (10 Cell NiMH) 4.5 minutes battery life

(theoretical) 12V; 20A Avg. Current Draw

5.25 minutes battery life (tested) 13.5V; 16A Avg. Current Draw May need to increase Capacity

Servo Batteries 750 mAh (5 Cell NiMH) Servo Controller draws

minimal current Battery Lifetime yet to be

determined Receiver added to Servo

Battery Pack to maximize the lifetime for Propulsion Battery Pack.

Electrical/Electromechanical Components DX6 Transmitter/Receiver Himax 2025 Brushless Motor Castle Creations Phoenix

25A ESC Recommended for motor

Micro Maestro 6 Ch USB Servo Controller Supports 4 Servos / 1 Gyro Programmable

Dual Axis Gyroscope (Pitch and Roll) May or may not be used Can fight with experienced

pilots

Electronics - Hardware

Electronics & Controls Main selections- DX6i 6-channel transmitter (Spektrum)- AR6200 6-channel receiver (Spektrum)- Micro Maestro 6-Channel USB Servo Controller (Pololu)- Digital Servo D65HB (HuiDa RC International Inc) - LPR510AL Dual-Axis Gyroscope (Pololu) Safety Manuever - Kill Throttle- Roll Right- Yaw Right- Nose Up

Electronics & Controls Block Diagram

Aircraft Optimization

Lift CoefficientDrag CoefficientEmpty Weight

Aircraft DimensionsWind Speed

Payload Size / WeightPropeller Size

Motor PropertiesGear Box

Battery PropertiesReference Payload

Reference Laps

PropulsionPower

AerodynamicsStructures

Performance

Optimized?

Yes

No

Mission ScoreOverall Score

Aircraft DimensionsPayload Size / Weight

Propeller SizeMotor Properties

Gear BoxBattery Properties

Top SpeedPerformance

Inputs Analysis Optimization Optimal Parameters

Payload ConfigurationImage of new golf ball arrangementSmaller size (width and height)

Better for gripping Less dragEasier to fit into suitcase

16 golf balls (~1.6lbs)Decrease size of steel bar

P/W ~ 1.5 instead of 2.5

Maximum weight ~3lbs loaded

HPMIImage of manufactured componentLearned process to fabricate compositesHoneycomb-core no good

Too heavy if filled with resinRequires different technique (wet layup)

Permitted access to HPMI facilitiesFriday 01/28 @ 8:30am

Manufacture more components for testingBegin to fabricate wings, fuselage, other

parts

Preliminary FabricationNomex Honeycomb-Carbon Fiber

Composite Attempted Vacuum Bagging Need Different Fabrication Method (Wet Layup) Too Heavy Foam Core to Replace Honeycomb Kevlar added to bottom for landing gear

Work in ProgressFabrication of First PrototypeMission and Performance Analysis CodePower System Simulink SimulationControl System ProgrammingCFD of PrototypeReport Compilation

Future WorkControl System TestingFlight TestingDesign OptimizationFinalize Report