Caitlyn McKay
Structures and Thermal
10 kg Integrator
Locomotion Phase – Rover, Deployment
Alternative Design – Accordion
1
AAE450 Spring 2009
Deployment
Linear Shaped Charge
Side view of Toy Ball
Copper
Lining
Explosive
Charge
Thermally
insulated
box
Toy ball
Charge Mass: 0.580 kg
Foam Mass: 0.040 kg
Total Mass: 0.620 kg
2
Foam
Charge
Picture not to scale
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Dust Repellant - Magnet
COM Equipment
Lunar Dust
Pull
0 kg
0.326 kg
Mass:
0.00024 kg
Cost: $15.00
3
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Dust
Moon dust made of:
– Rock fragments
– Mineral fragments
– Glassy particles
• Contain “natural iron”
Virtually all <10 m can be repelled by a
hand-held magnet.
Flux Density
COM Equipment
14.70 microTesla
Lunar Dust
1602.17 microTesla
4
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Sizing the Rover Wheel
Wheel Radius Rock Size Optimum Base Success
(m)
(m)
(m)
(%)
1.016
0.384
2.874
99.3
0.677
0.256
1.916
98.4
0.339
0.128
0.958
96.8
0.169
0.064
0.479
94.0
0.085
0.032
0.239
90.2
0.042
0.016
0.120
90.2
0.021
0.008
0.060
76.9
5
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Sizing the Rover Wheel
Optimum Base Size
Maximum Step Size
Rocks are taken as a “step” that needs to
be climbed.
R = radius, H = height, B = base
6
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Rover Update (Kamikaze)
Solar Panels
Batteries
Power (extra)
Communicatio
ns
Drive System
Structure
(frame)
Space Blankets
Wheels
Cooling System
7
kg
0.422kg
1.92kg
System Mass
Ballast Mass
Total
1.51kg
0.298kg
0.40kg
0.58kg
0.58kg
kg
5.7074kg
10kg
15.7074kg
Length
Width
0.23m
0.21m
Height
0.21m
* Life of 13 minutes.
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Accordion
Further analysis was done on the crushable
material to increase impact time.
I recommended not using a crushable
material because:
– Engine(s) would get in way of material for
small free fall distance.
– Added weight/length too great for free fall
from far distance, didn’t outweigh the
propellant to move the added mass.
8
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Accordion
 Assumption:
– Using
honeycomb
material,
would
completely
crush.
Only 2 of the 5 honeycomb types would crush, Alalloy 5056 3/8-5056-.0007p and ¼-5056-.0007p.
9
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Accordion
10
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
References
Calio, Anthony J., John W. Harris, John H. Langford, R. Mercer, Jamie
L. Moon, Scott H. Simpkinson, William K. Stephenson, Jeffrey L.
Warner, and Julian M. West, eds. Apollo 12 Preliminary Science
Report. Rep. no. SP-235. Washinton, D.C.: NASA, 1970. NASA. 26
Feb. 2009 <http://history.nasa.gov/alsj/a12/as12psr.pdf>.
"Evonik Foams - SOLIMIDE® Polyimide Acoustical and Thermal
Aircraft Insulation Foam -." Aerospace Technology. 01 Mar. 2009
<http://www.aerospacetechnology.com/contractors/thermal/evonik/>.
Kane, Molly. "Explosive Bolts." E-mail to the author. 4 Mar. 2009.
"Lunar/page1." Web.utk.edu. 02 Mar. 2009
<http://web.utk.edu/~pgi/lunar/page1.html>.
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AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
"NASA’s Dirty Secret: Moon Dust." Science Daily: News & Articles in
Science, Health, Environment & Technology. 02 Mar. 2009
<http://www.sciencedaily.com/releases/2008/09/080924191552.htm
>.
Novotney, Dave, and Meryl Mallery. "Historical Development of Linear
Shaped Charge." 43rd AIAA/ASME/SAE/ASEE. Proc. of Joint
Propulsion Conference and Exhibit, Cincinnati, OH. American
Institute of Aeronautics and Astronautics, 2007.
Pletta, Bryan J. "The Robotic All-Terrain Lunar Exploration Rover
(RATLER): Increased mobility through simplicity." NASA, Langley
Research Center, Selected Topics in Robotics for Space Exploration
(1993): 247-67.
Strong Neodymium Magnets Rare Earth K&J Magnetics. 02 Mar. 2009
<https://www.kjmagnetics.com/>.
Taylor, Lawrence A. "The Lunar Dust Problem: A Possible Remedy."
Space Resources Roundtable II. 2000.
12
AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal
Wijker, Jacob Job. Spacecraft Structures. New York: Springer, 2008.
Purdue University, West Lafayette, IN. 16 Feb. 2009
<http://http://www.springerlink.com/content/k4hv69/>.
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AAE450 Spring 2009
Caitlyn McKay
Structures and Thermal