Accession Number:

AD0657154

Title:

A PRACTICAL SOLUTION TO THE PROBLEM OF THERMAL BENDING IN SPACECRAFT EXTENDIBLE BOOMS.

Descriptive Note:

Technical memo.,

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1967-06-01

Pagination or Media Count:

65.0

Abstract:

The report considers solutions for the problem of protecting spacecraft extendible booms from thermal bending in sunlight. It was theorized that such protection could be achieved by devising a sunshield that would fit around the boom like a shroud, and that thermal bending would thus be reduced by orders of magnitude. However, no designs that would provide the desired protection and at the same time maintain compatibility between the boom and the boom-erection equipment were forthcoming and work on the sunshield was abandoned. This report describes a series of sunshield configurations that satisfy the compatibility requirements and have the following characteristics Stowed Volume - 2 cu in100 ft Weight - Less than 2 oz100 ft Projected Area Deployed - 2-3 times that of the bare boom Deployment - Automatic - no extra equipment required Retraction and Redeployment - Automatic - no extra equipment required Thermal Improvement Over Bare Boom - Greater than 1000.

Subject Categories:

  • Structural Engineering and Building Technology
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE