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The X-beam as a deployable boom for the space station
| Content Provider | Semantic Scholar |
|---|---|
| Author | Adams, Louis R. |
| Copyright Year | 1988 |
| Abstract | Extension of antennas and thrust modules from the primary structure of the Space Station will require deployable beams of high stiffness and strength, as well as low mass and package volume. A square boom crosssection is desirable for interface reasons. These requirements and others are satisfied by the X-Beam. The X-Beam folds by simple geometry, using single-degree-of-freedom hinges at simple angles, with no strain during deployment. Strut members are of large diameter with unidirectional graphite fibers for maximum beam performance. Fittings are aluminum with phosphor-bronze bushings so that compliance is low and joint lifetime is high. The several beam types required for different applications on the Space Station will use the same basic design, with changes in strut cross-section where necessary. Deployment is by a BI-STEM which pushes the beam out; retraction is by cables which cause initial folding and pull the beam in. INTRODUCTION The problems of launching and assembling the Space Station demand minimum package size and weight with maximum stiffness and strength. The design is shown in Figure i and embodies the following features: ° The mast articulation is the X-Beam version (patent pending) of the Astromast, shown in Figures 2 and 3, which has the following advantages: Zero strain in the members during deployment allows use of large strut cross sections and high modulus graphite fibers. Simple hinge angles minimize tooling costs. High torsional and bending beam stiffness is Maintained durin9 deployment. Maximum mast performance for minimum weight is achieved by using primarily unidirectional graphite fibers for all loaded members. Diagonal members perform as compression and tension members so that only one diagonal is required per face, minimizing mass and maximizing stiffness. *Astro Aerospace Corporation, Carpinteria, California PRECEDING PAGE BLANK NOT [OILMED 59 https://ntrs.nasa.gov/search.jsp?R=19880012089 2019-05-20T08:56:15+00:00Z |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880012089.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
