final design presentation
Post on 31-May-2015
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FINAL DESIGN PRESENTATION
ContentsGoals
Preliminary Design Shortcomings
Final Design Details
Construction Details
Bill of Materials
Product Performance
Lessons Learned
Project Goals
Create a working, autonomous hovercraft that can successfully navigate a course without hitting walls and overcoming the button obstacle at the start of the track.
Preliminary Design Shortcomings
Speed Controller H-Bridge
Materials Sensor Placement
Hull Structure
Parts Quantity Mass (g)
Radius (cm)
Length (cm)
Width (cm)
Height (cm)
Area (cm^2) Weight (N)
Top Plate 1 126.3 n/a 70 60 2.54 4200 1.24
Bottom Plate 1 68.1 n/a 60 50 2.54 2995 0.67
Support Bars 6 .04 n/a 1 1 3 1 negligible
Bottom Plate Holes
6 n/a 0.5 n/a n/a 2.54 0.79 n/a
Hull Structure and Skirt
Center of Pressure
.350m x .250m
Switch Actuation
Stripped CD Drive H-Bridge Relay
Button Presser Circuit
LevitationDelta GFB0912SHG 92x92x50.8mm Ultra High Output
12V Case Fan
Requirement
Flow rate 1.324M3/min
Pressure 5.29mmH20
Manufacturer Fan Curve Tested Fan Curve
Levitation Circuit
Propulsion
FrontBack
Button Pusher
Levitation FanPropulsion Fan
Propulsion FanPropulsion Battery
Levitation Battery
Propulsion
Acceleration
Forward= .15 m/s2 Angular= 1.26 rad/s2
Fan Specs
GWS EDF55D Ducted Fan with Brushless 3900KV
Motor
EDF 50A Ducted Fan with CN12-RLC Brushed Motor Combined Thrust=1.96N
Requirements
Thrust force greater than the Friction force of 1.69 N
Propulsion Circuit
Power
14.8V Lithium-Ion Battery with a 2.2
Amp Capacity and a 5 amp
Maximum Discharge Rate.
11.1VLithium-Ion Battery with a 4.4
Amp Capacity and a 5 Amp
Maximum Discharge Rate.
9V Battery for button-pushing
mechanism
Sensors and Actuators
QTR-8RC Reflectance Sensor
Array
Sharp IR Sensor
GP2Y0A02YK0F
• Wall Distance• Button Distance
• Line Reading• Line Counting
Sensors Circuitry
Control Algorithm
Keeping Straight
Turning
Before During
Returning Straight
After
Building Process
• Cut Deck Pieces
• Glue Decks with Support Bars
• Create Skirt Template
• Cut Fabric• Sew• Attach Skirt
Hull
• Test Fan• Attach• Wire• Test
Levitation
Levitation • Assemble Fans
• Test Fans• Attach
Servos• Wire Servos• Glue Fans to
Servos• Wire Fans• Test
Propulsion
Propulsion
• Strip CD Drive
• Build H-Bridge
• Attach • Wire• Test
Button Presser
Button Presser
• Test Sensors
• Wire Sensors
• Build Sensor Housing
• Attach Sensors
Sensors
Bill of MaterialsPart Model Cost
Hull Structure (with skirt) 16.00
Levitation Fan Delta GFB0912SHG Fan 9.99
Propulsion Fans EDF55D with brushless motor and EDF50A with brushed motor
51.73
Servos HRC31311S HS-311 Standard Servo 15.98
Levitation Battery Li-Ion 18650 14.8V 2200 mAhm 37.99
Propulsion Battery Li-Ion 18650 11.1V 4400 mAhm 56.62
Button Pusher (with H-bridge and motor)
14.66
Arduino 42.50
Sensors QTR-8RC Reflectance Sensor Array + Sharp GP2Y0A020F Distance Sensor
34.95
Circuitry 67.25
Total 347.67
Gantt Chart
Performance
Qualified to Compete!
Pressed the Button!
Navigated the Course!
Under Budget and On time!
Did not place however.
Lessons LearnedLeave plenty of time for parts to ship as companies don’t
always deliver on time
Chances are, something’s going to break. Buy extras if
possible.
Ensure that more than one team member is aware of every
step.
Questions???
?
Bill of Materials
item Model craft $Photosensor Array QTR-8RC Reflectance Sensor Array 14.95Servo (2,0) HRC31311S HS-311 Standard Servo 15.98Levitation fan Delta GFB0912SHG Fan 9.99Wiring 2pc board 1.995v relay (1) 2.995v relay (2) 4.69Glue Liquid Nails 3Infrared Sensor (2,0) Sharp GP2Y0A020F Analog Distance Sensor 20Foam 5Plywood 2Leviation Battery Pack Li-Ion 18650 14.8V 2200 mAhm Part No 31021 37.99Propulsion Battery Pack Li-Ion 18650 11.1V 4400 mAhm Part No 31016 56.62
Heat Sink 1 Heatsink For TO-220 Ohmite Heatsinks 1.8Arduino 42.5Skirt 63 pin-jst wire (1,1) JST 3-pin - BARE 3Propulsion Fan and motor (back) EDF50 EDF-2030x3 Rotor (GW/EDF50A 11.73Transistor MOSFET Transistor 3.29
Propulsion Fan and Motor (front)EDF55-300H with GWBLM005C GWS 2028-6 BRUSHLESS MOTOR 40
CD Drive 5Heat Sink 2 2.99Speed controller 35Perfboard Kit 1.50H-Bridge 9.669 Volt Battery 8
Total 347.67
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