l unar w heel mae 435 spring 2014 seth hughes robert york james taylor alicia najor shannon green...
TRANSCRIPT
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LUNAR WHEEL MAE 435 Spring 2014Seth Hughes Robert York James Taylor Alicia Najor
Shannon Green Trucmy Nguyen David Palmer
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Gantt Chart
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Major Concerns● Lunar conditions
○ Extreme temperatures○ Radiation○ Solar wind○ Large jagged rocks that create point loads
● Regolith○ The moon’s dust (regolith) is electrostatically charged and very abrasive○ Clogs wheel components
● Traction○ Slippage across an incline○ Slippage traveling up an incline
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Introduction
● Improvements upon last year’s wheel○ Replace welds with aerospace
adhesives ○ Handle point loads better○ Improve traction
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Methods: Design● Lack of exact vehicle constraints
○ Main focus of design concept is based on the lunar environment constraints
● Regolith and various sizes of meteor fragments
○ Large fragments cause extreme point loads■ Outer surface of the wheel needs to be flexible and
durable■ Elastic outer rim layer that will deflect and distribute
point load■ Design needs to be as open as possible to allow
regolith resistance
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Methods: Materials● Solution to clogging and coating of lunar regolith
○ NASA and n-gmat, a nano-materials company has produced a coating■ Made from the lotus flower that has self-
cleaning properties● Possible use of adhesive in place of rivets
○ Masterbond Supreme 10HT adhesive has a temperature range of -269 to 204 degrees Celsius■ NASA approved for low outgassing
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Material Selection
● 6xxx series alloys ○ contain magnesium and silicon and these alloys have a
good balance of corrosion resistance and strength
● Examined Aluminum 6061 T6, 6063 T6,and 6066 T6 ○ evaluated strength, corrosion resistance, malleability,
cost, and operation temperature tolerances
● Aluminum alloy 6061 T6 ○ reasonable yield strength, relative low cost, and good
corrosion resistance
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Monarch Wheel Mark III● Outer Layer
○ An offset pattern of kidney shaped springs form a layer meant to absorb large point loads.
● Inner Layer○ A series of five spring loaded hinged
spokes for a larger scale deflection, such as that from a large rock, allowing the tread to contact more surface
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Traction● Gecko tread
○ Independent spring mounted treads
■ improve traction and the wheels handling of point loads
■ rhombus shape gives lateral and longitudinal grip
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Methods: Testing● Impact testing
○ Impact testing on scaled models○ “Real-world” testing of prototypes
■ Wheels mounted on to a pickup truck and driven over various surfaces simulating those of the moon
● Compression testing
○ Point load testing of vehicle components
■ placed between two conical steel platforms and compressed until failure occurs
○ Spring testing
■ tested and evaluated so as to relate the springs linear k value to torsional and bending k values
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Methods: Testing● Traction testing
○ Lateral and longitudinal slip conditions○ Control and slip tests will be conducted
using scaled replicas at 1/5th scale of the designs over three surfaces ■ a regolith simulant, a rocky surface, and
a mixture of the two○ The tread pattern will be tested using a
remote control vehicle○ A dynamometer will be used to measure
torque required for slip
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Expected Budget Item Amount
Gas $50.00
Mileage (estimated) $50.00
CNC work $0
Hub Material $150.00
Regolith $0.00
Metal Concepts - Rear Wheels $1,200.00
Miscellaneous $350.00
Total $1,800
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Bibliography[1]D. V. Margiotta, W. C. Peters, S. A. Straka, M. Rodriguez, K. R. McKittrick, and C. B. Jones, "The Lotus coating for space exploration - a dust mitigation tool," in Optical System Contamination: Effects, Measurements, and Control 2010, 2-5 Aug. 2010, USA, 20 10, p. 77940I (7 pp.).[2]D. Cao, A. Khajepour, and X. Song, "Modeling generalization and power dissipation of flexible-wheel suspension concept for planetary surface vehicles," Vehicle System Dynamics, vol. 49, pp. 1299-1320, 2011/08/01 2011.[3]M.Abdel-rahman, A.Ahmed, E.Badawi, “Testing Natural Aging Effect on Properties of 6066 & 6063 Alloys using Vickers Hardness and Positron Annihilation Lifetime Techniques,” Defect and Diffusion Forum, Vol. 303-304, no., 107-112, Jul 13, 2010.
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Questions?