Design Team #11 1

Team Members Jeffery Aucoin Dima Eshtaya Sean Milley Jamie Zwicker Team Supervisor Dr. Robert Bauer 2

Introduction Existing Design Proposed Design 3

Rubber Stop Pad 4

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 5

Areas of Improvement Balance and Stability Difficulty/Technique Pad Wear and Lifetime Stopping Distance 6 on-inline-skates/

Stability 7 Existing DesignProposed Design

Testing Maximum speed: 30km/h Average stopping distance from 20km/h: 13m Stopping Distances from 20km/h JamieDimaJeffSean Trial # m14.61m14.51m12.59m Trial # m13.92m13.62m12.91m Trial # m12.98m13.49m12.61m Trial # m13.28m12.48m12.54m Average12.77m13.70m13.53m12.66m Average Group Stopping Distance13.16m 8

Requirements of Proposed Design 9

Design Requirements 1. Removable 2. Support a 225lb user 3. Improved braking distance 4. Maintain mobility/stability 5. Controlled stop 6. Increased lifetime 7. Serviceable 10

Foot Support Wheel Frame and Assembly Brake Actuator and Application Power Supply Control Unit 11

Foot Support Ability to attach over existing footwear Modify existing snowboard binding Add third strap Adjust mobility of back support 12

Wheel Frame Housing for all components of the skate ⅛ ” Square Channel Iron Dimensioned to incorporate range of shoe sizes 13

Electric Drum Disk 14

Electric/Magnetic Brakes Good for high speed braking Provides energy feedback Brake force diminishes as speed decreases Cannot lock up 15

Drum Brakes Least actuating force Complex setup Not easily serviceable Poor heat dissipation Prone to brake fade 16 brake1.htm

Disk Brakes High actuating forces High rate of heat dissipation Less susceptible to brake fade Easily serviceable Require little maintenance 17

Brake Torque Calculations 18

Disk Brake Calculations 19

Wheel Assembly All rotating pieces Axles Bearings Wheels Brake rotors 20

Hydraulic Pump Solenoid / Piston Setup Electric Motor with Power Screw and Piston Setup 21

Hydraulic Pump Provides adequate pressure Too Large in size / weight High cost 22

Solenoid / Piston Setup Provides adequate force Forces diminishes with displacement Large power requirement High current draw 23

Electric Motor with Power Screw and Piston High torque motor High forces generated High pressure output Low power consumption Low cost, weight and size 24 planetary-gearmotor.html

Power Screw Calculations Power Screw Specs Output Force Output rpm Output Rev/s Torque N*m Torque in*lb Thread Type ¼-20 LH Force Lb Force N Required Actuating Force = 78.5N

Solar Alternator Battery 26

Power Supply Solar Alternator Battery Power 27 CA&catalog=Online&category=RC+Toy+Batteries& product=

Hydraulic Lines Wireless 28

Hydraulic Lines Simplest Control Connects user’s hands to feet Mobility compromised 29

Wireless Additional Requirements Eliminates physical connection Mobility maintained 30 lu-high-power-motor- controller-1.html -usb-microcontroller- atmega168.html explorer-regulated.html

$1,

Budget 1 Braking, 1 Non-braking DescriptionQtyUnit PriceTotal PriceTotals Roller Blade Prototype1$ Attachment screws and bolts1$20.00 ratchet straps6$9.99 $59.94 strap buckle6$12.99 $77.94 axle rod1$6.50 square channel1$20.00 plastic foot support2$45.00 $ x 90mm wheels with bearings1$79.99 Section Sub-Total $ Braking Planetary gear and power screw motor1$35.55 Rotor2$10.00 $20.00 Hydraulic brake caliper with lever controlled piston1$ Hydraulic brake caliper1$80.00 Hydraulic fluid1$20.00 Section Sub-Total $ Wireless Controller Transmitter1$40.00 Receiver1$40.00 Micro Controller1$ Motor Controller1$50.00 Section Sub-Total $ Safety Equipment Helmet1$29.99 Mouth guard1$10.00 Section Sub-Total $39.99 Power source battery pack and charger for actuator motor1$ AA batteries for wireless controller1$20.00 Section Sub-Total $43.99 Total Summary sub total $1, % tax $ % miscellaneous $ final total $1,

Proposed Design 33

Final Design 34

The End 35