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Project MATV Final Presentation

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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