Methods to Mitigate Thermally Induced Distortion

by Fred M. Cutting, Honeywell, Inc, Clearwater, United States,



Document Type: Proceeding Paper

Part of: Engineering, Construction, and Operations in Space IV

Abstract:

The purpose of this paper is to show the magnitude of bending on the Space Station Freedom Navigation Base as induced by thermal expansion and contraction over the operating range -45 °F to 100 °F. The navigation base is supported on three flex mounts attached to Space Station Freedom truss structure. This paper documents the effects of the Navigation Base flex mount design on the Navigation Base distortion. Recommendations for design changes to meet the 60 arc second requirement are included. This paper shows that a hinge or pivot is required to avoid a bending moment induced by the flex mount on the Navigation Base. A hinge design is being incorporated into the Navigation Base mounting hardware as a result of this work. Standard hinge design practices are identified. Tolerance analysis and resulting `dynamic impacting' of a hinge is evaluated. Weight and complexity of both hinge and flex pivots are addressed. This paper is intended to identify the parameters which were considered for the redesign of the Navigation Base flex mounts.



Subject Headings: Dynamic analysis | Space stations | Space structures | Space truss | Plastic design | Thermal properties | Navigation (geomatic) | Distortion (structural)

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