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Tests of an alternate mobile transporter and extravehicular activity assembly procedure for the Space Station Freedom trussResults are presented from a ground test program of an alternate mobile transporter (MT) concept and extravehicular activity (EVA) assembly procedure for the Space Station Freedom (SSF) truss keel. A three-bay orthogonal tetrahedral truss beam consisting of 44 2-in-diameter struts and 16 nodes was assembled repeatedly in neutral buoyancy by pairs of pressure-suited test subjects working from astronaut positioning devices (APD's) on the MT. The truss bays were cubic with edges 15 ft long. All the truss joint hardware was found to be EVA compatible. The average unit assembly time for a single pair of experienced test subjects was 27.6 sec/strut, which is about half the time derived from other SSF truss assembly tests. A concept for integration of utility trays during truss assembly is introduced and demonstrated in the assembly tests. The concept, which requires minimal EVA handling of the trays, is shown to have little impact on overall assembly time. The results of these tests indicate that by using an MT equipped with APD's, rapid EVA assembly of a space station-size truss structure can be expected.
Document ID
19930001782
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Heard, Walter L., Jr. (NASA Langley Research Center Hampton, VA, United States)
Watson, Judith J. (NASA Langley Research Center Hampton, VA, United States)
Lake, Mark S. (NASA Langley Research Center Hampton, VA, United States)
Bush, Harold G. (NASA Langley Research Center Hampton, VA, United States)
Jensen, J. Kermit (Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Wallsom, Richard E. (Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Phelps, James E. (Lockheed Engineering and Sciences Co. Hampton, VA., United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1992
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
L-17051
NASA-TP-3245
NAS 1.60:3245
Accession Number
93N10970
Funding Number(s)
PROJECT: RTOP 506-43-41-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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