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Group 11- ASME Design Competition

Group 11- ASME Design Competition. Alicia Christie Desmond Bourgeois Toddrick Ruff. ASME Design Competition. Rule Update Rocks do need to touch receiving area 1 rock in each circle. Score S = Σ (R*t) +1000P - W - A - 1000T – 5s

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Group 11- ASME Design Competition

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  1. Group 11- ASME Design Competition • Alicia Christie • Desmond Bourgeois • Toddrick Ruff

  2. ASME Design Competition • Rule Update • Rocks do need to touch receiving area • 1 rock in each circle Score S = Σ (R*t) +1000P - W - A - 1000T – 5s R = designated rock score t = target multiplier W = Weight of the vehicle in grams A = milliamp-hours available to the device according to the battery labels T = Times device touches border tape s = seconds to complete task, maximum 240 P = bonus for parking vehicle at end of task (1 = parked, 0 = not parked) Schematic of Test Course 2 – 1700 pt rocks 1 – 1600 pt 2 - 1500pt 2 – 1000pt

  3. Decision from Last Presentation 3 – Wheel Design Street Sweeper Mechatronics, Ariel University Center

  4. Design Concept rotate move

  5. r + 2*cos(30)*[r+s/2] = 3.75 in Wheel set distance D = 4r + s : if r = 1 in, s = 1.18 in, D = 5.18 in D*2 + 4 in (box size with guides in back) = 14.36 in with wheels and box touching Max length is 14.5 in

  6. Design Concept ?

  7. Final Design • Wheels are offset with front wheels on inside barrier barrier

  8. Idea for body expansion • Switch blades Approximate Extension Length

  9. Interim Prototype

  10. 3 Wheel Operating Principle Exploded View Assembled View

  11. Gear Force Analysis • Assumptions • Const. load with uniform shock • Const. mesh with no backlash • Axial load is negligible • Qv < 5, low pinion velocity < 13m/s • 99% reliability • Full-depth teeth with tip loading • Pressure angle 20º • Operating temps < 200º • Teeth form standard AGMA profile Radial Tangential Axial

  12. Gear Force Analysis Given Resulting Forces

  13. Rock Collector

  14. Free Body Diagram 1lb 3lb Position #1 • Assumptions • Weight of box = 2lbs • Weight of Front = 7lbs • Tipping will not occur on back wheel 3lb 2lb 3.5in 1.5in 5.9in 10.225in ∑M = ∑F*d M = 34.04 lb-in, moment created by rock collector would have to exceed this limit to tip over giving a negative moment

  15. Cost Analysis

  16. Cost Analysis Current Total: $943.70

  17. Future Plan • FEM Analysis to determine ways to remove material • Exact gear placement to minimize motor use • Power input and velocity calculations • Exact placement of wheels and expandable body to fit within size requirement • Placement of batteries and motors • Control configuration • Amount of motors, gears, other control components • Program control components

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