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Moments applied in the manual assembly of space structures - Ease biomechanics results from STS-61BMeasurements of the level and pattern of moments applied in the manual assembly of a space structure were made in extravehicular activity (EVA) and neutral buoyancy simulation (NBS). The Experimental Assembly of Structures in EVA program included the repeated assembly of a 3.6 m tetrahedral truss structure in EVA on STS-61B after extensive neutral buoyancy crew training. The flight and training structures were of equivalent mass and geometry to allow a direct correlation between EVA and NBS performance. A stereo photographic motion camera system was used to reconstruct in three dimensions rotational movements of structural beams during assembly. Moments applied in these manual handling tasks were calculated on the basis of the reconstructed movements taking into account effects of inertia, drag and virtual mass. Applied moments of 2.0 Nm were typical for beam rotations in EVA. Corresponding applied moments in NBS were typically up to five times greater. Moments were applied as impulses separated by several seconds of coasting in both EVA and NBS. Decelerating impulses were only infrequently observed in NBS.
Document ID
19900038128
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cousins, D.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Akin, D. L.
(MIT Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1989
Publication Information
Publication: Acta Astronautica
Volume: 19
ISSN: 0094-5765
Subject Category
Astronautics (General)
Accession Number
90A25183
Funding Number(s)
CONTRACT_GRANT: NAS9-17266
CONTRACT_GRANT: NAS8-35996
Distribution Limits
Public
Copyright
Other

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