Design Team #11 1. Team Members Jeffery Aucoin Dima Eshtaya Sean Milley Jamie Zwicker Team...
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Transcript of Design Team #11 1. Team Members Jeffery Aucoin Dima Eshtaya Sean Milley Jamie Zwicker Team...
Design Team #11
1
Design Team #11Team Members
Jeffery AucoinDima EshtayaSean MilleyJamie Zwicker
Team SupervisorDr. Robert Bauer
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IntroductionExisting Design Proposed Design
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http://www.jacqdesign.com/img/blog/photos/RollerbladeCrossfire4D.jpg
Rubber Stop Pad
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Existing Design
Rubber Pad attached to the heel of one rollerblade
To stop user must push the pad against the ground to create a braking force
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http://www.skatescool.com/inline-skating/learn-how-to-t-stop-on-inline-skates/
Areas of Improvement
Balance and Stability
Difficulty/Technique
Pad Wear and Lifetime
Stopping Distance
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http://www.skatescool.com/inline-skating/learn-how-to-t-stop-on-inline-skates/
Stability
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Existing Design Proposed Design
Testing
Maximum speed: 30km/h
Average stopping distance from 20km/h: 13m
Stopping Distances from 20km/h Jamie Dima Jeff SeanTrial #1 13.20m 14.61m 14.51m 12.59mTrial #2 13.11m 13.92m 13.62m 12.91mTrial #3 12.54m 12.98m 13.49m 12.61mTrial #4 12.21m 13.28m 12.48m 12.54m
Average
12.77m
13.70m
13.53m
12.66m
Average Group Stopping Distance
13.16m
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Requirements of Proposed Design
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Design Requirements1. Removable2. Support a 225lb user3. Improved braking distance4. Maintain mobility/stability5. Controlled stop6. Increased lifetime7. Serviceable
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Foot SupportWheel Frame and AssemblyBrake Actuator and ApplicationPower SupplyControl Unit
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Foot Support
Ability to attach over existing footwear
Modify existing snowboard binding
Add third strap
Adjust mobility of back support
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http://5150snowboarding.com/product/ff1500
Wheel FrameHousing for all
components of the skate
⅛” Square Channel Iron
Dimensioned to incorporate range of shoe sizes
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ElectricDrumDisk
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Electric/Magnetic BrakesGood for high speed
braking
Provides energy feedback
Brake force diminishes as speed decreases
Cannot lock up15
http://www.flightglobal.com/blogs/runway-girl/Gear%20shot%201.JPG
Drum BrakesLeast actuating force
Complex setup
Not easily serviceable
Poor heat dissipationProne to brake fade
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http://auto.howstuffworks.com/auto-parts/brakes/brake-types/disc-brake1.htm
Disk BrakesHigh actuating forces
High rate of heat dissipationLess susceptible to
brake fade
Easily serviceable
Require little maintenance
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http://mtobikes.com/wp-content/magura-louise-mountain-bike-disc-brake.jpg
Brake Torque Calculations
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Disk Brake Calculations
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Wheel Assembly
All rotating pieces
AxlesBearingsWheelsBrake rotors
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Hydraulic PumpSolenoid / Piston SetupElectric Motor with Power Screw and Piston Setup
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Hydraulic Pump
Provides adequate pressure
Too Large in size / weight
High cost
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http://www.mesltd.co.uk/images/ZSIM21118476.jpg
Solenoid / Piston SetupProvides adequate
force
Forces diminishes with displacement
Large power requirement
High current draw23
http://www.fwmurphy.co.uk/images/RP23xx_solenoid_medres.jpg
Electric Motor with Power Screw and Piston
High torque motor
High forces generated
High pressure output
Low power consumption
Low cost, weight and size
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http://www.robotshop.ca/rbban07-banebots-planetary-gearmotor.html
Power Screw CalculationsPower Screw Specs
Output Force
Output rpm
Output Rev/s
Torque N*m
Torque in*lb
Thread Type
444 7.41.45
412.8
69¼-20
LH
Force Lb
Force N
412.9 1842
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http://www.roton.com/application_engineering.aspx
Required Actuating Force = 78.5N
SolarAlternatorBattery
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Power Supply
Solar
Alternator
Battery Power
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http://www.thesource.ca/estore/product.aspx?language=en- CA&catalog=Online&category=RC+Toy+Batteries& product=2300322
Hydraulic LinesWireless
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Hydraulic Lines
Simplest Control
Connects user’s hands to feet
Mobility compromised
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http://media.rei.com/media/dd/84f36172-d484-4224-a6cc-00a2fa3e0ec6.jpg
WirelessAdditional
Requirements
Eliminates physical connection
Mobility maintained
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http://www.robotshop.ca/pololu-high-power-motor-controller-1.html
http://www.robotshop.ca/dfrobot-usb-microcontroller-atmega168.html
http://www.robotshop.ca/sfe-xbee-explorer-regulated.html
$1,330.74
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Budget 1 Braking, 1 Non-braking Description Qty Unit
PriceTotal Price
Totals
Roller Blade Prototype 1 $100.00 $100.00 Attachment screws and bolts 1 $20.00 $20.00 ratchet straps 6 $9.99 $59.94 strap buckle 6 $12.99 $77.94 axle rod 1 $6.50 $6.50
square channel 1 $20.00 $20.00 plastic foot support 2 $45.00 $90.00
8 x 90mm wheels with bearings 1 $79.99 $79.99 Section Sub-Total
$454.37
Braking Planetary gear and power screw motor 1 $35.55 $35.55 Rotor 2 $10.00 $20.00 Hydraulic brake caliper with lever
controlled piston1 $150.00
$150.00 Hydraulic brake caliper 1 $80.00 $80.00 Hydraulic fluid 1 $20.00 $20.00 Section Sub-Total
$305.55
Wireless Controller
Transmitter 1 $40.00$40.00
Receiver 1 $40.00 $40.00 Micro Controller 1 $108.00 $108.00 Motor Controller 1 $50.00 $50.00 Section Sub-Total
$238.00
Safety Equipment
Helmet 1 $29.99$29.99
Mouth guard 1 $10.00 $10.00 Section Sub-Total
$39.99
Power source battery pack and charger for actuator motor
1 $23.99$23.99
16 AA batteries for wireless controller 1 $20.00 $20.00 Section Sub-Total
$43.99
Total Summary sub total $1,081.90 13% tax $140.65 10% miscellaneous $108.19
final total
$1,330.74
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Proposed Design
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Final Design
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The End
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