Large Space Structure Figure Estimation and Control

This report describes an experimental structure which has been constructed to demonstrate and validate recent and emerging technologies in the active control and identification of large flexible space structures. The configuration consists of a large, 20 foot diameter antenna-like flexible structure...

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Bibliographic Details
Main Authors: Vivian, Howard C, Blaire, Patrick E, Eldred, Daniel B, Fleischer, Gerald E, Ih, Che-Hang C
Format: Report
Language:English
Subjects:
ACTUATORS
ADAPTIVE CONTROL SYSTEMS
ANALOG SYSTEMS
CODERS
CONTROL
DISTRIBUTION
ELECTRODYNAMICS
FLEXIBLE STRUCTURES
GIMBALS
HORIZONTAL ORIENTATION
HUBS
INDUCTION SYSTEMS
LSS(LARGE SPACE STRUCTURES)
Mechanics
METHODOLOGY
MOUNTS
OPTICAL DETECTORS
OPTICAL PROPERTIES
PARAMETERS
PE62302F
REAL TIME
REMOTE DETECTORS
RIBS
SAMPLING
SHAPE
SPACE SYSTEMS
SPACECRAFT
STATE OF THE ART
STATICS
STRUCTURAL RESPONSE
TERMINALS
Unmanned Spacecraft
WUAFAL286400DR
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Description
Summary:This report describes an experimental structure which has been constructed to demonstrate and validate recent and emerging technologies in the active control and identification of large flexible space structures. The configuration consists of a large, 20 foot diameter antenna-like flexible structure in the horizontal plane with a gimballed central hub, a flexible feed- boom assembly hanging from the hub, and 12 flexible ribs radiating outward. Fourteen electrodynamic force actuators mounted to the hub and to the individual ribs provide the means to excite the structure and exert control forces. Thirty permanently mounted sensors, including optical encoders and analog induction devices provide measurements of structural response at widely distributed points. An experimental remote optical sensor provides sixteen additional sensing channels. A computer samples the sensors, computes the control updates and sends commands to the actuators in real time, while simultaneously displaying selected outputs on a graphics terminal and saving them in memory. Several control experiments have been conducted thus far and are documented in this report. These include implementation of distributed parameter system control, model reference adaptive control, and static shape control. These experiments have demonstrated the successful implementation of state-of-the-art control approaches using actual hardware.