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MEEG401: Shock Mitigating Marine Seat - PowerPoint PPT Presentation


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Team 7: Vincent Borsello , Michael Brill, Daniel Gempesaw , Travis Mease Sponsor: Revenge Advanced Composites Advisor: Dr. James Glancey. Revenge Advanced Composites Composites in marine applications Industry-leading technology Currently designing a new composite boat.

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Team 7: Vincent Borsello, Michael Brill, Daniel Gempesaw, Travis Mease

Sponsor: Revenge Advanced Composites

Advisor: Dr. James Glancey


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  • Seat manufacturing process

  • Attachment Mechanism

  • Damping Mechanism

  • Frame

Shockwave

Seat (144 lbs)

Ullman Atlantic

Seat (100 lbs)


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  • Focus manufacturing process: Minimize the weight of the Support Structure while maintaining strength

  • Several parts were pre-selected by our sponsor, Revenge Advanced Composites

    • Semi-active shock absorber

    • The seat will be configured to match our design

    • Boat navigation Controls will be integrated into the prototype


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  • 50% Weight Reduction manufacturing process

    • Relative to Shockwave Seat (144 lbs)

  • Dynamic Load Damping Capabilities

    • 20 G’s Vertical, 4 G’s Fore/Aft, 4 G’s Lateral

  • Product Life: 1400 working hours

    • ~150 instances of worst case vertical load

  • Reduced Footprint/Size

    • Less than 28 x 40 in^2

  • Manufacturing

    • Best Practices for Pre-impregnated fibers (Prepreg)


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  • Arm manufacturing process

    • C-channel

  • Base

    • Direct load path

    • Minimal footprint

  • Clevis

    • Integrate shock into design

  • Pivot Point

    • Bushing, Rod, Plates

3

1

4

2


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Vertical ≈ 20 G’s manufacturing process

  • Dimensions & geometry

    • Force analysis of structure

  • Material Considerations

    • Strength and Stiffness

    • Curing/Outlife Characteristics

    • Weathering/Corrosion

  • Analyze all modes of failure (6)

  • Manufacturing Issues

    • Mold Designs

    • Ply Patterns

Lateral ≈ 4 G’s

Fore/Aft ≈ 4 G’s


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Shape/Geometry of Structure manufacturing process

Applied Loads

Varying Thickness Capability

Bolt Layout

Bolt Sizes

Washer Dimensions

Bearing Size

Pivot Point Mechanism

Arm to Seat Attachment

Structure to Boat Attachment

Load Paths

Composite Ply Layout

Hole Distance From Edges

Clevis Attachment

Rider Comfort

Material Selection

Core Dimensions

Adhesive Selection

Support Plate Dimensions

Seat Dimensions

Hole Sizes

Composite Manufacturability

8


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Side FBD of Mechanism for illustration purposes


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Approximate arm & base as simple C-channels to calculate moments of inertia


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d analysis to derive thickness1

Shear Area

Thickness=t

  • Inter-laminar shear

  • Compression

  • Failure modes for bolts:

    • Tension

    • Pull-out

d2

Top-down view of base flange

Depiction of Tear-out failure


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X_a analysis to derive thickness

R_bearing

R_rod

Y_a

Cantilever Arm

  • Pivot pin was found to fail due in tear-out

    • Low inter-laminar shear strength of composites

  • Solution: Bond on a metal doubler plate


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Side view of Clevis Plate

Top-down view of Clevis Plate


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  • De-molding analysis to derive thickness

    • Draft Angle – 2 degrees

  • Bridging

    • Minimum Radius of Curvature – 1 inch

  • Vacuum Molding

    • Extending Mold Surfaces for Vacuum Bagging


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1 analysis to derive thickness

2

3

4


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5 analysis to derive thickness

7

6


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9 analysis to derive thickness

8

10

11


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12 analysis to derive thickness

14

13


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16 analysis to derive thickness

15

17


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19 analysis to derive thickness

18

20

Layup

Mold

Part


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22 analysis to derive thickness

21

23

25

24

26


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  • Fatigue Tests Life.

  • Different Materials

    • Carbon Fiber

    • Titanium

  • Bolt on Boat Testing

  • Target the lowest factor of safety

  • Different seat

  • Finish coating/ aesthetics


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  • Stephen Andersen Life.

  • Jim Glancey

  • Michel Lourdemarianadin

  • Hope Deffor

  • Steven Beard

  • Jon Sadowsky

  • RAC

  • Special Warfare Group 7


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