Design Metrics

1
Design Metrics

• Maneuverability
• Effectiveness
• Transition
• External Force Effect
• Weight
• Power
• Size/Deck Arrangements

Maintenance Well Deck Storage Noise
Vibration Technology Risk Ease of
Acquisition/ Manufacturability Susceptibility
2
Design Metrics

• Ranked on a scale of 1 to 5
• 1 least important
• 5 most important
• Tradeoff weighting assigned using following
  equation

3
Trade-off Theory

• Two Stage Trade-off
• First Stage
• Hybrid system components
• Second Stage
• Standalone system components
• Top choice from First Stage Trade-off

4
Trade-off Theory

• Each system receives a rating (1 to 10) for each
  Metric
• Ratings based on Rules
• Ranking S (Rating Weighting) all Metrics
• LOWEST Ranking is BEST

5
Trade-off Rules

• Maneuverability - rocks, ditches, trees, turning,
  standing objects 2 points for each (subtract
  from 10)
• Effectiveness - 1 or 10 (yes or no)
• Transition - 1/2 point for every 15 seconds of
  transition 1 point for each obstacle sand bar,
  well deck, rocks, waves
• External Force Effect - waves, wind, rain,
  current
• 2 points for each
• Foreign object damage - susceptibility of each
  system

6
Trade-off Rules

• Weight - of the system divided by the weight of
  the vehicle
• Power - power required for the propulsion system
• Size/Deck Arrangements - foot print area (on
  deck) divided by available deck area Available
  deck whole deck-cargo deck-machinery
• Maintenance - 1, 5, 10 (1little regular
  maintenance bike 5moderate maintenance car
  10significant maintenance airplane)

7
Trade-off Rules

• Well deck storage - yes or no (able to fit into
  the boat storage)
• Noise/Vibration - 1, 5, 10 (1little noise
  computer 5moderate noise loud 10significant
  noise ear protection)
• Technology Risk - 1, 5, 10 (1proven on ACV
  5Not proven on ACV, but used elsewhere
  10untested)
• Ease of acquisition/Manufacturability - 1, 5, 10
  (1know where to get it 5need strings 10none)

8
Characterization of Rollagons

• Maneuverability - one point for ditches, trees,
  turning, and standing objects
• Effectiveness - feasible land propulsion system
• Transition - around 1 minute from water system to
  land system possible interference from rocks or
  objects on the ocean bottom
• External force effect - waves and wind could
  effect our hydraulic boons possibility of
  foreign objects

9
Characterization of Rollagons

• Size/deck arrangements - rollagons would take up
  roughly half of deck space
• Maintenance - would not need any significant
  amount of maintenance.
• Well deck storage - the rollagons do not inhibit
  the vehicle from fitting in the boat
• Noise/vibration - rollagons will be moderately
  quiet
• Technology risk - not proven on an ACV at this
  moment