1. KEVIN DAHYA STRUCTURES – ERV

2. KEVIN DAHYA STRUCTURES - ERV
Shape – Cylindrical with nose cone
Better Pressure Vessel
Easier to fit into faring
Weight reduction
Aerodynamics

3. KEVIN DAHYA STRUCTURES - ERV
Red – Crew Quarters
Grey – Outer Shell
Gold – Rover Garage

4. KEVIN DAHYA STRUCTURES - ERV

5. KEVIN DAHYA STRUCTURES - ERV
Sizing Breakdown
Crew Quarters ~300m3
Propulsion/
In-Situ Plant ~200m3
Rover Garage ~110m3

6. KEVIN DAHYA STRUCTURES - ERV
Hoop Stress (insignificant)
Sigma (hoop) = 25 Mpa
Sigma (yield) = 276 Mpa
Weight Studies
Solid Aluminum m ~8 Tonnes
Sigma (hoop) = 60MPa
Current Configuration ~3.5 Tonnes
Sigma (hoop) = 25Mpa

7. KEVIN DAHYA STRUCTURES - ERV
Modal Analysis
Natural Frequency (fnat)
Fnat Axial = 166 Hz
Fnat Lateral = 31 Hz
Must be greater than 35Hz (Axial) and 15 Hz Lateral

8. KEVIN DAHYA STRUCTURES - ERV
Future Work
More Accurate Launch Loads
Landing Loads
Design of Landing Legs
Weight Refinement