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Proceedings Paper

Structural control sensors for control, astrophysics, and structures experiment in space
Author(s): Hugh W. Davis; John P. Sharkey; Connie K. Carrington
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Paper Abstract

The Control, Astrophysics and Structures Experiment in Space (CASES) will investigate critical control technology applicable to sthbilizing and pointing large flexible structures in space. This shuttle-based experiment will provide active control ofa 32 m extendibleboom structure usinggas thrusters for pointing and angular momentum exchange devices (AMED) for active damping to suppress vibrations. In conjunction with this controls-structures interaction experiment, an x-ray diffraction instrument will investigate high energy sources at the center of the galaxy and on the surface ofthe Sun. An occulter plate on the tip ofthe boom and proportional counters at the base of the boom comprise an x-ray telescope with a 32 m length. High spatial resolution depends on accurate knowledge and, to alesser extent, control ofthe position ofthe boom tip assembly relative to the proportional counters located at the base ofthe boom. The Remote Attitude Measurement Sensor (RAMS) was designed to provide high accuracy and update rates while measuring numerous reflective targets on a flexible structure. RAMS is presently baselined to fill two important sensor needs for CASES. First, as a tip displacement sensor, RAMS willprovide accurate knowledge ofthe position and orientation of the boom tip assembly. Second, as a boom motion tracker, RAMS will monitor 43 reflective targets that are distributed along the length ofthe boom and provide displacement (eigenvector) information for post-facto processing. This paper describes the design and operation of RAMS as both a tip displacement sensor and a boom motion tracker. It explains how RAMS interfaces with the CASES closed-loop control system and how systems identification is accommodated.

Paper Details

Date Published: 1 October 1990
PDF: 15 pages
Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); doi: 10.1117/12.21506
Show Author Affiliations
Hugh W. Davis, Ball Aerospace Systems Group (United States)
John P. Sharkey, NASA/Marshall Space Flight Ctr (United States)
Connie K. Carrington, NASA/Marshall Space Flight Ctr (United States)


Published in SPIE Proceedings Vol. 1303:
Advances in Optical Structure Systems
John A. Breakwell; Victor L. Genberg; Gary C. Krumweide, Editor(s)

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