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Draper (Charles Stark) Lab., Inc., Cambridge,
CONTROL OF FLEXIBLE STRUCTURES-2 (COFS-2) FLIGHT
CONTROL, STRUCTURE AND GIMBAL SYSTEM
INTERACTION STUDY Final Report
Stanley Fay, Stephen Gates, Timothy Henderson, Lester Sackett,
Kim Kirchwey, Isaac Stoddard, and Joel Storch Sep. 1988
205 p
(NASA-CR-172095; R-2088; NAS 1.26:172095) Avail: NTIS HC
A10/MF A01 CSCL 22B
The second Control Of Flexible Structures Flight Experiment
(COFS-2) includes a long mast as in the first flight experiment,
but with the Langley 15-m hoop column antenna attached via a
gimbal system to the top of the mast. The mast is to be mounted
in the Space Shuttle cargo bay. The servo-driven gimbal system
could be used to point the antenna relative to the mast. The
dynamic interaction of the Shuttle Orbiter/COFS-2 system with
the Orbiter on-orbit Flight Control System (FCS) and the gimbal
pointing control system has been studied using analysis and
simulation. The Orbiter pointing requirements have been assessed
for their impact on allowable free drift time for COFS experiments.
Three fixed antenna configurations were investigated. Also
simulated was Orbiter attitude control behavior with active vernier
jets during antenna slewing. The effect of experiment mast dampers
was included. Control system stability and performance and loads
on various portions of the COFS-2 structure were investigated.
The study indicates possible undesirable interaction between the
Orbiter FCS and the flexible, articulated COFS-2 mast/antenna
system, even when restricted to vernier reaction jets. Author
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