NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Performance Evaluation of an Actuator Dust Seal for Lunar OperationExploration of extraterrestrial surfaces (e.g. moon, Mars, asteroid) will require durable space mechanisms that will survive potentially dusty surface conditions in addition to the hard vacuum and extreme temperatures of space. Baseline tests with lunar simulant were recently completed at NASA GRC on a new Low-Temperature Mechanism (LTM) dust seal for space actuator application. Following are top-level findings of the tests completed to date in vacuum using NU-LHT-2M lunar-highlands simulant. A complete set of findings are found in the conclusions section.Tests were run at approximately 10-7 torr with unidirectional rotational speed of 39 RPM.Initial break-in runs were performed at atmospheric conditions with no simulant. During the break-in runs, the maximum torque observed was 16.7 lbf-in. while the maximum seal outer diameter temperature was 103F. Only 0.4 milligrams of NU-LHT-2M simulant passed through the sealshaft interface in the first 511,000 cycles while under vacuum despite a chip on the secondary sealing surface.Approximately 650,000 of a planned 1,000,000 cycles were completed in vacuum with NU-LHT-2M simulant.Upon test disassembly NU-LHT-2M was found on the secondary sealing surface.
Document ID
20140009203
Document Type
Technical Memorandum (TM)
Authors
Delgado, Irebert R. (NASA Glenn Research Center Cleveland, OH United States)
Gaier, James R. (NASA Glenn Research Center Cleveland, OH United States)
Handschuh, Michael (Ohio State Univ. Columbus, OH, United States)
Panko, Scott (ASRC Aerospace Corp. Cleveland, OH, United States)
Sechkar, Ed (ASRC Aerospace Corp. Cleveland, OH, United States)
Date Acquired
July 16, 2014
Publication Date
September 1, 2013
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
NASA/TM-2013-216587
GRC-E-DAA-TN10013
E-18781
Funding Number(s)
WBS: WBS 647280.04.01.03
CONTRACT_GRANT: NNC12BA01B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
lunar
seal
actuator
simulant

Available Downloads

NameType 20140009203.pdf STI