Lander Egress Design Progress Report 9/26/2011

Rover Egress Design11/9/2011Hahna AlexanderAnton GalkinZack Morrison

1Anton 1Results Outline2Ramp Segment DesignHinge DesignDeployment MechanismComposite AnalysisFabricationReady to Manufacture3

Ready to Manufacture4

Drawings Bill of Materials Finalized

Hinge Modifications5

Spring Deployment Mechanism6

Spring Deployment Mechanism7

Frangibolts Reusable, ExpensiveHitch Pin for Earth-Ramps practicalAdjustable for Lunar Design

Ramp Segment Design8Flange4 HeightNo TaperX+ PatternReduced Thickness

Design Changes: Base Pattern9Changed Base Platform Pattern: ANSYS

NEWOLDMoment on Ramp Segments10

Moment Drives Truss Design11

Moment Drives Truss Design12

Tapered Design Considered13Taper

No Taper

Buckling14Finite Element Analysis Strange ResultsHand calculationsFactor of Safety = 3

Design Parameter Optimization15Sheet Metal Thickness

Fillet RadiusX Pattern Dimension #1

X Pattern Dimension #2Strength-to-Weight RatioFactor of Safety

Ramp Segment Design16Flange4 HeightNo TaperX+ PatternReduced ThicknessANSYS Results17

ANSYS simulations for stress and buckling used to improve design

Composite Testing 18Off-Planet use of composites more practical than Aluminum

Composites will be lighterAbout 2.25kg, Full two segments (no holes), FOS >2

Composite Testing19

Work to be Completed20Manufacturing NREC, mfg.com

Implementing the Test Plan Geometry, Small Scale, Landing Conditions, etc.

1Written Blog Left

Final Paper Questions?21

Moment Drives Truss Design22