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Reconfigurable Seat for Humvee Simulator Lockheed Martin Group #8 Shannon Whyms Jeremy Riggs Ryan Hendrickson Mei-Ling Liber
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Overview Project Scope Current Design and Problem Areas Product Specifications Concept Generation and Design Analysis Materials Future Plans
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Project Scope The goal of this project is to design and build a seat for the Virtual Combat Convoy Trainer (VCCT). A reconfigurable seat design for converting the trainer between HMMWV & truck configurations.
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Current Design Two-piece seat with reconfigurable cushions Prong and slot design Crank for height adjustment
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Problem Areas Current design has had structural problems and is fairly complex Deformation of back support after repeated use Vertical height adjustment is tedious
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Product Specifications Reconfigurable Withstand a 300N (70 lb) horizontal load Fore and aft adjustment Height adjustment Seat and/or seatbelt should be symmetrical Target weight of the seat is ~ 89- 100 N (20- 25lbs)
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Concept Generation One-piece seat Addition of latches Hydraulic Piston for height adjustment Stationary seatbelt placement Rails address fore and aft adjustment
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Concept Design Fully assembled seat Seat and latch assembly only Back view
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Concept Design Gas Spring Lift Female Latch Box assembly with rails and male latch
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Analysis & Assumptions Seat can be modeled as a rigid body Latches are crash tested Seat rails are sufficiently sturdy Comparison between original and concept design using finite element analysis
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Shear Analysis Point of failure: Latch Bolts Applied force at the seatback translates to a shear force at the latches Total weight translates to a compression force at the latches Once shear and compressive forces are known, bolts can be sized
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Bolts Grade 5 Medium Carbon Steel Yield Strength: 92,000 psi Shear Strength: 55,200 psi Factor of Safety: 2 Allowable Yield Strength: 46,000 psi Allowable Shear Strength: 27,600 psi Bolt Size: ¼ -20
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Finite Element Analysis Original Prong Design Our Concept
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Materials Frame of chair: Low carbon AISI C-1008 Covering of chair: Foam Padding Screws/pins: Grade 5 Medium Carbon Steel Box: OEM Gas Lift: OEM
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Cost Analysis Procured Items PartVendorQuantityCostSubtotal PistonSwivel Chair Parts1$62.33 BoltBolt Depot1$16.57 Latch SetChevrolet4$81.41$325.62 SeatbeltJunkyard1$0.50 Steel (seat)Speedy Metals4$50.00$200.00 Custom Services WeldingCOE Machine Shop N/A $0.00 UpholsteryTBD $300.00$300 Total Cost $905.02
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Future Plans Analysis Analytical calculation of force required for unlatching Fatigue analysis on joints Overall Sourcing and procurement of materials and parts Manufacturing and assembly
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Acknowledgements Lockheed Martin Jeff Payne David Bogle Dr. P.J. Hollis
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References Hibbeler, R.C., “Statics and Mechanics of Materials,” Second Edition, Prentice-Hall, Inc., Boston, Copyright 2004. Norton, Robert, “Machine Design: An Integrated Approach,” Third Edition, Pearson Prentice Hall, Upper Saddle River, Copyright 2004.
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