Transcript Lander Egress Design Progress Report 9/26/2011

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ROVER EGRESS DESIGN
11/9/2011
Hahna Alexander
Anton Galkin
Zack Morrison
Results Outline
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Ramp Segment Design
 Hinge Design
 Deployment Mechanism
 Composite Analysis
 Fabrication
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Ready to Manufacture
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Ready to Manufacture
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Drawings
Bill of Materials Finalized
Hinge Modifications
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Spring Deployment Mechanism
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Spring Deployment Mechanism
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Frangibolts Reusable, Expensive
Hitch Pin for Earth-Ramps practical
Adjustable for Lunar Design
Ramp Segment Design
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Flange
4” Height
No Taper
X+ Pattern
Reduced Thickness
Design Changes: Base Pattern
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Changed Base Platform Pattern: ANSYS
OLD
NEW
Moment on Ramp Segments
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Moment Drives Truss Design
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Moment Drives Truss Design
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Tapered Design Considered
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Taper
No Taper
Buckling
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Finite Element Analysis
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Strange Results
Hand calculations
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Factor of Safety = 3
Design Parameter Optimization
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Strength-to-Weight Ratio
Factor of Safety
Sheet Metal Thickness
Fillet Radius
X Pattern Dimension #1
X Pattern Dimension #2
Ramp Segment Design
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Flange
4” Height
No Taper
X+ Pattern
Reduced Thickness
ANSYS Results
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ANSYS simulations for stress and buckling used to improve design
Composite Testing
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Off-Planet use of composites more practical than Aluminum
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Composites will be lighter
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About 2.25kg, Full two segments (no holes), FOS >2
Composite Testing
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Work to be Completed
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Manufacturing – NREC, mfg.com
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Implementing the Test Plan
 Geometry,
Small Scale, Landing Conditions, etc.
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1Written Blog Left
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Final Paper
Questions?
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Moment Drives Truss Design
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