Group 11- ASME Design Competition

1
Group 11- ASME Design Competition

• Alicia Christie
• Desmond Bourgeois
• Toddrick Ruff

2
Overview of Design Competition

• Optimize Score
• Weight
• Power used (mAh)
• Time
• Accuracy
• Follow Competition Rules
• Size (14.5 x 6.5 x 6.5 in)

Schematic of Test Course
3
Decision from Last Presentations
3 Wheel Design
Rock Collector
Mechatronics, Ariel University Center
4
Changes to Drive Train
Old Design
5
Changes to Drive Train

• New Design
• Lighter
• Decreased Complexity
• Increased Reliability
• Increased Modularity

6
Gear and Motor Selection
Gears Material Molded Nylon Torque 41 Speed
1.51
Motors DTXC 3315 Speed Controllers DTXM 1280
and 1281
7
Control Logic
Old Design
New Design

• Tele-operation
• Wireless
• No Fabrication
• Big Transmitter

• Umbilical Cord
• Tethered
• Fabricated Control Box
• More Compact

Umbilical Cord
8
Control Logic
Top view of robot
Signal Type Analog Ch 1-4 Digital Ch 5-6
Channel Number 1 2 3 4 5 6
M8
M9
M1
M3
M6
M4
M2
M7
9
Platform Design
Old Design
New Design
10
Changes to Rock Collector
New Design
Old Design

• ½ shorter length
• Walls are Cast Acrylic and spaced with putty to
  make lighter
• Difference is 224.3g
• Density of Aluminum 2.70g/cm3
• Density of Cast Acrylic 1.2g/cm3

11
Expandable Body
x
y

• Expansion based on design changes is 3.61
• 2y x 3.61
• x 0.95
• y 2.28

Light-weight spring-assisted knives
12
Removing Material from Backing

• Problem
• Weight is a constrain on the overall score
• Rock Collector Backing
• Al 6061
• Solution
• Remove material from robot
• Strength is important!!!

13
Swiss Cheese Design
Inspiration Avoid notch stress concentration
14
X-Bracket Design
Inspiration Bridges and trusses
Notch stress concentration
15
H-Bracket Design
Inspiration Least material possible
16
Thanks To

• Sponsors
• American Society of Mechanical Engineers
• Boeing
• Individuals
• Dr. Carl Moore
• Dr. Dave Cartes
• Dr. Chiang Shih
• Dr. Daudi Waryoba

17
References

• Density of Aluminum
• http//www.mansfieldct.org/schools/mms/staff/hand/
  Density.htm
• Density of Plexiglas
• http//www.boedeker.com/acryl_p.htm