final design review autonomous hovercraft
DESCRIPTION
Final Design Review Autonomous Hovercraft. Mechanical Engineering 8936 Term 8 Design Project April 3, 2012. INTRODUCING. SPROCKET. Agenda. Project Scope Development Design Specifications Execution Final Prototype Hardware Code Logic Diagram Risks Project Management - PowerPoint PPT PresentationTRANSCRIPT
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Final Design ReviewAutonomous Hovercraft
Mechanical Engineering 8936Term 8 Design Project
April 3, 2012
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INTRODUCING
2SPROCKET
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AgendaProject ScopeDevelopmentDesign SpecificationsExecutionFinal PrototypeHardwareCode Logic DiagramRisksProject ManagementProject ChallengesFuture Considerations
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Project Scope
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The objective of the design team is to design and build a hovercraft that is:
Autonomous - Able to navigate a proposed path free of operating input.
Path should be free of:DisturbancesObstacles
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Development
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Component TestingSkirts Motors/Fans Sensors
Parameter Study
Governing Equations
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Design Specifications
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Parameter Specification Final Parameter
Diameter < 20 inches 15.5 inches
Total Weight < 5 kg 1.5 kg
Nominal operational Speed ≈ 5 km/hr 4.5 km/hr
Turning Radius < 2x Diameter < 15.5 inches
Acceleration > 0.14 m/s^2 0.2 m/s^2
Deceleration > 0.14 m/s^2 0.2 m/s^2
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Execution
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Prototype TestingSensors Parameters Gains
Controls Integration
Control Board Sensors Logic
Parameter DeterminationYaw Drag Dart
Effect Inertia Thrust
Prototype Construction
Body Skirt Mounts
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Final Prototype
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Range Finding IR
Compass
Control Board
Wall Detection IR’s
Control Board Battery
Drive Battery
Thrust Motors
Top View
Power MOSFET
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Final Prototype
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Bottom View
Motor
CentrifugalLift Fan
Baffles
Skirt
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HardwareRomeo Control BoardArduino BasedIntegrated Motor DriverAllows for Bluetooth, GPS, Servo Motor Future\ Expansion
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Code LogicTravel Down HallwayIdentify CornersPerform Turns in Sequence & Stop
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Code Logic Diagram
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Code Logic Diagram
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Risks
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Type Hazard ControlSafety
Sharp Corners Eliminate Sharp CornersExposed Props Cover Props if Dangerous
Electrical and Batteries Contain Electronics Environment
Batteries Dispose of hazardous waste properly
Material Try to eliminate waste and material used
Cost
Over BudgetHave a contingency and
use old parts already purchased
ScheduleOverruns Weekly Update Schedule
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Project Schedule
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Project Timeline (weeks)
January February March April
Consecutive Week 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
Dates
8 Ja
n - 1
5 Ja
n
16 J
an -
22 J
an
23 J
an -
29 J
an
30 J
an -
05 F
eb
06 F
eb -
12 F
eb
13 F
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19 F
eb
20 F
eb -
26 F
eb
27 F
eb -
04 M
ar
05 M
ar -
11 M
ar
12 M
ar -
18 M
ar
19 M
ar -
25 M
ar
26 M
ar -
01 A
pr
02 A
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08 A
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09 A
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15 A
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16 A
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22 A
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23 A
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29 A
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1.1 Project Definition1.2 Scope1.3 Research1.4 Simulation1.5 Procurement1.6 Construction1.7 Testing
2.0 Project Definition2.1 Project Scope2.2 Definfing Project Roles2.3 Defining Hovercraft Path2.4 Defining Existing Material Invetory
3.0 Research3.1 Basic hovercraft theory3.2 Skirt Material
3.2.1 Foam3.2.2 Rubber3.2.3 Cloth
3.3 Hardware & Sensors3.3.1 Motors3.3.2 Arduino Board3.3.3 Compass3.3.4 IR Sensors3.3.5 Sonar3.3.6 Gyro
3.4 Fans3.4.1 Lift Fan3.4.2 Thrust Fans
4.0 Simulation4.1 Understanding Governing Equations4.2 Parameter Study
4.2.1 Root Locus Plots4.2.2 Simulink Simulation
4.3 Determination of Parameters4.4 Determining Various PID Gains
5.0 Procurement5.1 Arduino Board5.2 Sonar Sensor5.3 Compass5.4 Gyro Sensor5.5 Motors
6.0 Construction6.1 Body6.2 Skirt6.3 Motor Mounts6.4 Sensor Mounting6.5 Battery Mounting
7.0 Testing7.1 Parameter Testing
7.1.1 Mass7.1.2 Moment of Inertia7.1.3 Yaw Damping7.1.4 Dart Effect7.1.5 Prop Torque7.1.6 Friction
7.2 Thrust Fan Testing7.3 Sensor Testing
7.3.1 Sonar7.3.2 Compass7.3.3 Gyro7.3.4 IR Sensors
7.4 Integration of all sensors7.5 Path Testing
1.0 Mini Design Report #11.1 Mini Design Presentation #1
2.0 Mini Design Report #22.1 Mini Design Presentation #2
3.0 Final Report3.1 Final Presentation
1.0 Mini Design Report #1 30-Jan1.1 Mini Design Presentation #1 30-Jan
2.0 Mini Design Report #2 28-Feb2.1 Mini Design Presentation #2 28-Feb
3.0 Final Report 4-Apr3.1 FinalPresentation 4-Apr
High Level Design
Detailed Design
Submission Preparation
Objectives / Milestones
1.1 Project Definition1.2 Scope1.3 Research1.4 Simulation1.5 Procurement1.6 Construction1.7 Testing
High Level Design
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Project Budget
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Starting Budget
Faculty of Engineering $ 250.00
Group Members $ 200.00
Total Budget: $ 450.00
Costs to Date
Sonar Range Finder $ 26.89
Gyroscope $ 41.19
Digital Compass $ 37.11
DF Robot Microcontroller $ 37.11
Propellers $ 6.00
Motors $ 12.00
HST/S&H $ 31.10
Total Project Cost $ 191.40
Remaining Funds $ 258.60
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Project ChallengesUncontrolled Environment
Non-uniform Test SurfacePedestrian TrafficObstaclesMagnetic Interference
Battery Inconsistency
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Future ConsiderationsBluetoothSensorsCoverPrototype SizeVideo Surveillance
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ReferencesBeardmore, Roy. Root Locus Methods. Ed.
Roy Beardmore. N.p., July. Web. 17 Jan. 2012. <http://www.roymech.co.uk/Related/Control/root_locus.html>.
Kalpakjian, Serope, and Steven Schmid. Manufacturing Engineering and Technology.
Fifth ed. Upper Saddle River: Pearson Education, 2006. N. pag. Print.
Rethwisch, David G. Materials Science and Engineering An Introduction. Seventh ed. New York: John Wiley & Sons, 2007. Print. 19
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Project Website
www.autonomoushovercraft.yolasite.com
Please Visit!
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Thank You!
Special Thanks to:Professor Michael Hinchey
Tom PikeSteve Steele
Craig Mitchell
Please Feel Free To Ask Any Questions
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Back up
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Design Parametersα = Hovercraft Angle Headingβ = Hovercraft Angle of VelocityE = Drive ForceF = Friction ForceT = Yaw TorqueM = Mass I = Yaw InertiaK = Dart Effect J = Yaw DragX = Prop Coefficient Relating Ramp up SpeedY = Prop Coefficient Relating Maximum TorqueZ = Coefficient of Friction
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Governing Equations
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Equations of Motion Drive Equation
Yaw Control
Translation Control
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Simulation
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Variable Effect Design Considerations
Mass: MFaster response more damping for smaller
valuesLightweight
Moment of Inertia: I
Faster response for smaller values, damping
effect negligible
Mass located to reduce moment of inertia
Yaw Damping: J
Response speed decreases with increasing
values. Damping only signification for J = 0.
Low yaw damping desirable
Dart Effect: K
Unstable for negative values, slower response
for increasing values, negligible damping
Balance mass as well as possible, front heavy is unstable, back heavy is
stable but reduces response time
Prop Torque: Y
Poor damping at low values, negligible
response speed until a crit ical value where
response speed decreases
Ensure sufficient torque available for fast
response, control system design to compensate for
poorer damping
Friction: Z Faster response, more damping at higher values High friction desirable
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Sprocket in Deep Tank
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