Design Team #11

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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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