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Project MATV Final Presentation

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Project MATV Final Presentation. Jonathan Cole Fabio Faragalli Trevor Dwyer. April 7, 2010. Outline. Project MATV Initial Vision Project Objectives Design Iterations MATV Solid Model Model Overview Drive-train Suspension Design FEA Analysis Axles Suspension Arms Final Design.

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Project MATV Final Presentation

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  1. Project MATVFinal Presentation Jonathan Cole Fabio Faragalli Trevor Dwyer April 7, 2010

  2. Outline • Project MATV • Initial Vision • Project Objectives • Design Iterations • MATV Solid Model • Model Overview • Drive-train • Suspension Design • FEA Analysis • Axles • Suspension Arms • Final Design

  3. Initial Vision • Small all-terrain vehicle • Able to navigate rough terrain and water obstacles • Battery powered • Chain driven from two electric motors • Provide enough power and clearance to climb stairs • Remote control operation • Skid steer design • 6 independently sprung wheels • Water tight platform • Able to fit through a standard door • Ample room for the mounting of recording, navigational, and controls equipment

  4. Term Objectives • Initial design iteration • Hydraulic powered concept • Independent hydraulic wheel motors • Tandem bi-directional hydraulic pump • Driven by a 4 stroke gasoline engine • Objectives: • Enough torque to navigate vertical obstacles • Lift nose of vehicle with leading wheels • 24 hour autonomy

  5. MATV Specifications • 6 wheel platform • Amphibious • Weight less than 300lbs • 50lbs payload • Minimum 2ft3 cargo space • Robust off-road suspension • Independently sprung wheels • 12-14” ground clearance • Less than 48” wide • Vmax 30km/h

  6. Initial Design Issues • Weight • Spec: 300 lbs with a payload of 50 lbs • Actual: 600+ lbs total • Large weight of independent wheel motors & suspension arms • Cost • Cost estimate ~$10,000 • Wheel motors $720 US per motor ($4200+ total) • Tandem pump $1000+ • Operating Pressures • 2000 psi for entire hydraulic system • Motor limited • 1/3 operating pressure drop per motor (series)

  7. Improvement Opportunities • Drive-train • Hydraulic transmission / chain driven system • Torque potential • Weight & cost savings • Suspension Design • Swing-arm suspension • Ground clearance & width potential • More suitable for chain drive • Simplified hub & shock design

  8. System Regression Analysis

  9. System Characteristics • Required HP dependent only on weight. • Regardless of operating pressure. • Limit of 5.5HP engine is 600lb @ 45° slope. • Required pump displacement and flow rate highly dependent on operating pressure. • Transmission (pump/motor) can handle 4500psi intermittent and 3000psi continuous. • This translates to 1300lb(+) capacity @ 3000psi. • Tire diameter only affects gear ratio. • Required torque at wheels dependent on gear ratio. • Engine governed at 3600rpm, transmission Max 4000rpm.

  10. Solid Model • 80/20 frame • Allows for easy adjustments • Light weight while maintaining strength

  11. Platform Design • Aluminum outer shell • Light weight and corrosion resistant • Amphibious • Houses components

  12. Drive Train • Upper Shaft • Notched at either end to allow the bearing to be secured • Partially keyed to allow the attachment of the gears without hindering the bearings

  13. Drive Train • Lower Shaft • Similarly Notched to allow the bearings to be securely attached • Keyed to allow the attachment of the gear

  14. Suspension • Swing Arm Design • Allows for greater travel and ground clearance • Reduces overall width and supports the use of the chain drive

  15. Wheel Assembly • Pillowblock Bearings • 3/4 inch • 5/8 inch • Flange mounts • 5/8 inch • 2 ½ inch bolted • Gear • 5/8 inch • U-channel • 3/16 inch

  16. FEA Analysis • Axles • Suspension Arms

  17. Upper Axles (Impulse momentum) Strain (10 kN) Displacement (10 kN) 0.7 inch

  18. Axial LoadSwing arm 3/16 inch Strain (10 kN) Displacement (10 kN)

  19. Axial LoadSwing arm 5/8 inch Strain (10 kN) Displacement (10 kN)

  20. MATV Weight Estimate

  21. MATV Cost Estimate

  22. Final Component Design • Honda GX690 Engine • 22.3 Hp @ 3600rpm • 35.6 ft∙lb @ 2500rpm • Sauer Danfoss BDU-21H • Output Torque = 72.1 N·m • Operating pressure 3250 psi • Dp/Dm = 1.28 in3

  23. Optimal Gear Ratio

  24. Questions?

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