Rollerblade braking system

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Design Team #11
1
Design Team #11
 Team Members
 Jeffery Aucoin
 Dima Eshtaya
 Sean Milley
 Jamie Zwicker
 Team Supervisor
 Dr. Robert Bauer
2
Introduction
Existing Design
Proposed Design
http://www.jacqdesign.com/img/blog/photos/RollerbladeCrossfire4D.jpg
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
http://www.skatescool.com/inline-skating/learn-how-to-t-stop-on-inline-skates/
5
Areas of Improvement
 Balance and Stability
 Difficulty/Technique
 Pad Wear and Lifetime
 Stopping Distance
http://www.skatescool.com/inline-skating/learn-how-to-t-stopon-inline-skates/
6
Stability
Existing Design
Proposed Design
7
Testing
 Maximum speed:
30km/h
 Average stopping
distance from 20km/h:
13m
Stopping Distances from 20km/h
Jamie
Dima
Jeff
Sean
Trial #1
13.20m
14.61m
14.51m
12.59m
Trial #2
13.11m
13.92m
13.62m
12.91m
Trial #3
12.54m
12.98m
13.49m
12.61m
Trial #4
12.21m
13.28m
12.48m
12.54m
Average 12.77m 13.70m 13.53m 12.66m
Average Group Stopping
Distance
13.16m
8
Requirements of Proposed Design
9
Design Requirements
1.
2.
3.
4.
5.
6.
7.
Removable
Support a 225lb user
Improved braking distance
Maintain mobility/stability
Controlled stop
Increased lifetime
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
http://5150snowboarding.com/product/ff1500
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
http://www.flightglobal.com/blogs/runway-girl/Gear%20shot%201.JPG
15
Drum Brakes
 Least actuating force
 Complex setup
 Not easily serviceable
 Poor heat dissipation
 Prone to brake fade
http://auto.howstuffworks.com/auto-parts/brakes/brake-types/discbrake1.htm
16
Disk Brakes
 High actuating forces
 High rate of heat
dissipation
 Less susceptible to brake
fade
 Easily serviceable
http://mtobikes.com/wp-content/magura-louise-mountain-bike-disc-brake.jpg
 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
http://www.mesltd.co.uk/images/ZSIM21118476.jpg
22
Solenoid / Piston Setup
 Provides adequate force
 Forces diminishes with
displacement
 Large power requirement
http://www.fwmurphy.co.uk/images/RP23xx_solenoid_medres.jpg
 High current draw
23
Electric Motor with Power
Screw and Piston
 High torque motor
 High forces generated
 High pressure output
 Low power
consumption
http://www.robotshop.ca/rbban07-banebotsplanetary-gearmotor.html
 Low cost, weight and
size
24
Power Screw Calculations
Power Screw Specs
Output Output Torque Torque Thread
rpm
Rev/s
N*m
in*lb
Type
444
7.4
1.454 12.869
¼-20
LH
http://www.roton.com/application_engineering.aspx
Output Force
Force
Lb
412.9
Force
N
1842
Required Actuating Force = 78.5N
25
Solar
Alternator
Battery
26
Power Supply
 Solar
 Alternator
 Battery Power
http://www.thesource.ca/estore/product.aspx?language=enCA&catalog=Online&category=RC+Toy+Batteries& product=2300322
27
Hydraulic Lines
Wireless
28
Hydraulic Lines
 Simplest Control
 Connects user’s hands to
feet
 Mobility compromised
http://media.rei.com/media/dd/84f36172-d484-4224-a6cc-00a2fa3e0ec6.jpg
29
Wireless
 Additional
Requirements
 Eliminates physical
connection
http://www.robotshop.ca/polo
lu-high-power-motorcontroller-1.html
http://www.robotshop.ca/dfrobot
-usb-microcontrolleratmega168.html
http://www.robotshop.ca/sfe-xbeeexplorer-regulated.html
 Mobility maintained
30
$1,330.74
31
Budget
Roller Blade
Section Sub-Total
Braking
1 Braking, 1 Non-braking
Description
Prototype
Attachment screws and bolts
ratchet straps
strap buckle
axle rod
square channel
plastic foot support
8 x 90mm wheels with bearings
Section Sub-Total
Power source
Section Sub-Total
Total Summary
1
1
6
6
1
1
2
1
$100.00
$20.00
$9.99
$12.99
$6.50
$20.00
$45.00
$79.99
$100.00
$20.00
$59.94
$77.94
$6.50
$20.00
$90.00
$79.99
$454.37
Planetary gear and power screw motor
Rotor
Hydraulic brake caliper with lever controlled piston
Hydraulic brake caliper
Hydraulic fluid
Section Sub-Total
Wireless Controller Transmitter
Section Sub-Total
Safety Equipment
Qty Unit Price Total Price Totals
1
2
1
1
1
$35.55
$10.00
$150.00
$80.00
$20.00
$35.55
$20.00
$150.00
$80.00
$20.00
$305.55
Receiver
Micro Controller
Motor Controller
1
1
1
1
$40.00
$40.00
$108.00
$50.00
Helmet
Mouth guard
1
1
$29.99
$10.00
$40.00
$40.00
$108.00
$50.00
$238.00
$29.99
$10.00
$39.99
battery pack and charger for actuator motor
16 AA batteries for wireless controller
sub total
13% tax
10% miscellaneous
final total
1
1
$23.99
$20.00
$23.99
$20.00
$43.99
$1,081.90
$140.65
$108.19
$1,330.74
32
Proposed Design
33
Final Design
34
The End
35
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