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EPD 160 Project

EPD 160 Project. THE CLIENT : Mark Novak Outreach Specialist Biological Systems Engineering. The Needs : Hand Controls for Safe and Reliable Lawn Tractors Design Practical and Efficient Adaptable/Mobile Design Design.

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EPD 160 Project

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  1. EPD 160 Project

  2. THE CLIENT: Mark Novak Outreach Specialist Biological Systems Engineering The Needs: Hand Controls for Safe and Reliable Lawn Tractors Design Practical and Efficient Adaptable/Mobile Design Design

  3. PROBLEM STATEMENT Create a practical hand-controlled device to operate the for/aft movement for a lawn tractor which can be used by individuals with lower body disabilities without impeding normal operation. It must be safe, reliable, durable, and removable whilst remaining both costeffective and mechanicallyefficient.

  4. Joystick Box controls Alt kill switch * Pressure sensitive * Separate brake control Jet ski controls * Pneumatic hand controls * Cruise control Motor with gear Segway controls * Cane/stick Throttle Water proofs Motorcycle control * Wireless Pulley wire Mechanical brake 2nd battery source Brainstorming

  5. Throttle (10) Mechanical brake (8) Joystick (4) Motor with gear (3) Separate brake control (2) Motorcycle control(1) Alt kill switch (0) Box controls Cane/stick Water proofs Pressure sensitive Jet ski controls Pneumatic hand controls Cruise control Segway controls Wireless Pulley wire 2nd battery source Evaluation

  6. Decision of Throttle Design Basis of our Decision: • Most votes • Easiest to assemble mechanically • Easy to control • Most cost effective

  7. Attachment of Throttle to Transmission • Initial design modeling • Test-bench/prototype • Mounting of throttle • Cross pieces/attachments to throttle • Mounting plate • Final product

  8. Initial Modeling Designs • Throttle is attached to a series of levers • Levers are connected to for/aft transmissions • Open circles are loose joints that rotate • Cylindrical bar is attached to the mounting plate

  9. Test-bench / Prototype • Took measurements of dimensions from tractor and location of levers • Constructed replica of tractor segments and operation of the throttle/levers

  10. MOUNTING of THROTTLE • Aluminum box shape • Notch attaches to back of throttle • Throttle slides down into the mounting piece

  11. Cross Pieces / Attachments to Throttle 3 Types of Attachments • Flat rectangular steel bar 2. Solid cylindrical steel bar used for rotation of levers 3. Screws / bolts for attachment

  12. Mounting Plate • 2 aluminum plates that are mirror images of each other • Placed on each side of the tractor frame and attached with screws • Cylindrical bar is inserted through the bearings

  13. Final Product • Adjusted length of the pieces and size of the screws in order to accommodate within actual confinements • Culmination of previous designs

  14. Considerations We took the following into consideration: • Range of motion • Reduced physical exposure of product • Position of product on the tractor • Types of materials used • Strengths / durability of product

  15. Considerations(continued) Shearing Stress calculations (Strength of Material): τ(ave) = P/A= F(force)/A (area) Shear, MPa of structural steel: 145x10^6 Mpa Area: π [(.25in)(2.54cm/in)(1m/100cm)]^2 Force= Aτ = 4129 lbs (max stress) “Calculations of Throttle yield” 4129x = F1y x = 5 inches, y = 9 inches F1 =2293.89 lbs (conservative number used, never put more than 2000 lbs force on throttle!!!)

  16. Considerations(continued) • Excess motion that did not apply to for/aft movements • Tight fit of levers and throttle • Lack of proper testing • Weather resistant CriticalDesignAnalysis:

  17. Considerations(continued) • More time for testing and constructing • Greater budget for better materials • Customizable lawn tractor • Experience Steps for Improvement:

  18. CONCLUSION Through our ideas and intuitive thinking, we were able to complete the design of functioning hand-controls for the lawn tractor. We believe, you, the client, will accept our ideas and make improvements upon them and hopefully someday be able to apply it to the real world.

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