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Includes geosciences (general); earth resources and remote sensing; energy production and conversion; environment pollution; geophysics; meteorology and climatology; and oceanography.

For related information see also Space Sciences.

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For space radiation see 93 Space Radiation.

47 METEOROLOGY AND CLIMATOLOGY Includes weather forecasting and modification.

3486

48 OCEANOGRAPHY

3487

64 NUMERICAL ANALYSIS

Includes biological, dynamic, and physical oceanography; and marine resources.

For related information see also 43 Earth Resources and Remote Sensing.

For related information see also 54 Man/System Technology and Life Support.

3496

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LIFE SCIENCES

Includes life sciences (general); aerospace medicine; behavioral sciences; man/system technology and life support; and space biology.

66 SYSTEMS ANALYSIS

Includes data sampling and smoothing; Monte Carlo method; and stochastic processes.

3499

Includes mathematical modeling; network analysis; and operations research.

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tion.

Includes sound generation, transmission, and attenua

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AND SPACE POLICY

Includes NASA appropriation hearings; aviation law; space law and policy; international law; international cooperation; and patent policy.

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Note: N.A. means that no abstracts were assigned to this category for this issue. SUBJECT INDEX

N.A.

PERSONAL AUTHOR INDEX

CORPORATE SOURCE INDEX

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1-1

I-51

1-59

I-71

1-73

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ONTRACT OR GRANT
REPORT NUMBERS
PRICE CODE

ON MICROFICHE

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

(Contract NAS9-17560)

(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
Author
system, even when restricted to vernier reaction jets.

CORPORATE SOURCE

PUBLICATION DATE

AVAILABILITY SOURCE
COSATI CODE

xii

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