The process for selecting guest investigators for participation in the Control of Flexible Structures (COFS)-1 program is described. Contracts and grants will be awarded in late CY87. A straw-man list of types of experiments and a distribution of the experiments has been defined to initiate definition of an experiments package which supports development and validation of control structures interaction technology. A schedule of guest investigator participation has been developed

Fontana, Anthony

Wright, Robert L.

English

NASA Technical Reports Server

N87 :. 16034
COFS I GUEST INVESTIGATOR PROGRAM
Anthony Fontana and Robert L. Wright
NASA Langley Research Center
Hampton, Virginia
First NASA/DOD CSI Technology Conference
Norfolk, Virginia
November 18-21, 1986
PRECEDING p/_F.. BLANK NOT FILMED
319
https://ntrs.nasa.gov/search.jsp?R=19870006601 2020-03-20T12:05:39+00:00Z
S_4MAR¥
The process for selecting guest investigators for participation in the COFS-I
program _s in place. Contracts and grants will be awarded in late CY87. A straw-man
llst of types of experiments and a distribution of the experiments has been defined
to initiate definition of an experiments package which supports development and
validation of CSI technology. A schedule of guest investigator participation has
been developed.
320
COFS-I GUEST INVESTIGATOR PROPOSAL REVIEW PROCESS
Potential guest investigators have submitted approximately 60 proposals in
response to the Dear Colleague Letter of February 7, 1986 which announced the
opportunity to participate in the COFS-I Guest Investigator Program. The proposal
review process is presented in figure I. The Technical Merit Panel is made up of
ten members from five NASA centers -- MSFC, GSFC, JSC, JPL, LaRC. The Technical
Reviewers are given 1 month for individual evaluation of the proposals prior to the
formal meeting of the Technical Merit Panel at LaRC in October. Proposals
considered responsive by the Technical Merit Panel are reviewed by the Accommoda-
tions Panel and Business Panel for implementation feasibility and cost aspects. The
Technical Merit Panel reviews and approves any changes made by the Accommodation
Panel or Business Panel to insure that the integrity of the experiment package is
preserved. The Experiment Evaluation Board is made up of five senior members from
five NASA centers. This board reviews and approves the experiment package recom-
mended by the Technical Merit Panel. The review process is completed at NASA Head-
quarters by the Controls/Structures Interaction (CSI) Steering Committee with final
selection for negotiations being made by the OAST Associate Administrator in early
1987. Contracts will be awarded in late CY87.
I DISTRIBUTION t
DCL SUBMISSION I _.._[ TECHNICALRELEASE
, REVIEWERS
' COMPLETE
TECHNICAL ]
MERIT
REVIEW
PANEL
COFS I
GUEST INVESTIGATOR PROPOSAL
REVIEW PROCESS
OAST
AA
- SELECTION
COMPLETE
I [ START LaRC / I
PROCUREMENTC%#;gT
INITIAL N_
_ EXPERIMENT |
\ PACKAGE /
I ACCOMMODATIONASSESSMENT
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TECHNICAL I
MERIT
REVIEW
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I BUSINESSIASSESSMENT I]
I I EXPER'MENT|
__--f STE'_ING L_; £XP'E;;MENTS I.._--/EvALuATION BOARDIng( EXPEdiENT iCOMMITTEE|- \&EXP. MIX J / DIRECTOR FOR I \ PACKAGE X
• TECHNICAL MERIT
• ENGR. & MISSION REQUIREMENTS .:
• PRIORITIES
• CONSTRAINTS
• RESOURCES & SCHEDULES .-
• FLIGHT OPPORTUNITIES
• PROGRAMMATIC MIX .;
Figure 1
321
PANEL (_I_RTERS
The Charter of each panel is shown In figure 2. The Technical Merit Panel
makes a technical evaluation of each proposal and assembles the best of the
proposals Into an integrated on-ground and on-orbit experiments package which best
supports development and validation of Control/Structures Interaction (CSI)
technology. The Technical Merit Panel reviews the output of the Accommodation Panel
and Business Panel to insure the preservation of the integrity of the experiments
package. The Accommodations Panel defines the hardware and software modifications
that must be made to the Mast Flight Article in order to accommodate the proposed
experiment. This Panel also establishes the feasibility of implementing these
modifications and assesses the safety of each proposed experiment. The Business
Panel establishes the validity of the experiment cost as presented by the proposer
and the cost to NASA for implementing the experiment on the Mast Flight Article.
Thls panel also evaluates the overall management plan presented by the proposer.
The Experiments Evaluation Board reviews and approves the final experiments package
recommended by the Technical Merit Panel and makes a recommendation for selection to
NASA Headquarters.
@ TECHNICAL MERIT PANEL
O EVALUATE PROPOSALS AND ESTABLISH THE TECHNICAL MERITS OF EACH
O RECOMMEND A PACKAGE OF PROPOSALS WHICH BEST SUPPORTS CSI
TECHNOLOGY ADVANCEMENT
O REVIEW AND APPROVE CHANGES MADE TO THE RECOMMENDED PACKAGE
BY THE ACCOMMODATIONS OR BUSINESS PANELS
• ACCOHHODATIONS PANEL
O DEFINE FLIGHT ARTICLE H/W AND S/W MODIFICATIONS OR
DEVELOPMENTS REOUIRED FOR IMPLEMENTATION
O DECIDE ON FEASIBILITY OF THESE H/W AND S/W MODIFICATIONS OR
DEVELOPMENTS
O ASSESS SAFETY OF THE PROPOSED EXPERIMENT
• BUSINESS PANEL
O INDEPENDENTLY ESTIMATE EXPERIMENT COST AS PROPOSED BY THE GI
O ESTIMATE COST OF FLIGHT ARTICLE H/W AND S/W MODIFICATIONS OR
DEVELOPMENTS REQUIRED FOR NASA IMPLEMENTATION
O ASSESS MANAGEMENT PLAN AND INSTITUTIONAL SUPPORT
• EXPERIMENT EVALUATION BOARD
O REVIEW AND APPROVE THE EXPERIMENTS PACKAGE RECOMMENDED BY THE
TECHNICAL MERIT PANEL
O MAKE RECOMMENDATIONS FOR SELECTION TO NASA HEADQUARTERS
322
Figure 2
STRAW-NAN LIST OF TYPES OF EXPERIMENTS
A list of potential experiment categories is presented in figure 3. Each
category is defined below.
I. Deployment Kinematics and Dynamics - Prediction of beam kinematics, loads,
strains, and deflections that occur during on-orblt deployment and retraction.
2. Static Linearlty of Deployed Beam - Development of a sensor system for measure-
ment of straightness of deployed beam on-orblt. Prediction of precision of
straightness of deployed beam and variation of precision after disturbance.
3. Structural Characterization
a) Design of excitation algorithms for use on-orblt for purposes of exciting
the structure to produce dynamic response data containing the desired
characterization information.
b) Design of identification algorithms for use on-ground, post-fllght for
purposes of extracting the structural characteristics from dynamic response
data taken on-orblt.
c) Design of identification algorithms which reside in the flight article
computer and are used open-loop, on-orbit to extract structural characteris-
tics from dynamic response data.
4. Control Law Evaluation
a) Design of non-dlstrlbuted control algorithms using collocated sensors and
actuators for purposes of on-orbit, real-tlme, disturbance suppression.
b) Design of distributed control algorithms using non-collocated sensors and
actuators for purposes of on-orblt, real-tlme, disturbance suppression.
c) Design of adaptive control algorithms for use on-orbit which automatically
adjust for such things as sensor/actuator failures, and changes in
structural characteristics.
5. Hardware Development - Development of sensors, active actuators, passive
dampers, structural members, etc. for on-orbit evaluation.
6. Other - Review of the proposals may define additional categories.
• DEPLOYMENT KINEMATICS AND DYNAHICS
• STATIC LINEARITY OF DEPLOYED BEAM
STRUCTIIRAL CHARACTERIZATION
o EXCITATION ALGORITHMS
o GROUND-BASED SYSTEM IDENTIFICATION
0 ON-ORBIT, OPEN-LOOP, SYSTEM IDENTIFICATION
CONTROL LAW EVALIIATION
o COLLOCATED DISTIIRBANCE SIIPPRESSION
o DISTRIRIITED CONTROL
o AnAPTIVE CONTROL
HARDWAREDEVELOPMENT
Figure 3
323
DESIRED CONTENT OF EXPERIMENT PACKAGE
The COFS-I GI experiments package should be an integrated combination of
on-ground and on-orbit experiments which best supports the development and valida-
tion of Controls/Structures/Interaction (CSI) technology. The package should
include experiments from each of the previously discussed categories with emphasis
on structural characterization experiments and control law evaluation experiments.
Ground-based system identification is technically critical and relatively inexpen-
sive since flight quality software is not required. Therefore, a large number of
these ground-based system identification experiments is justified. Other structural
characterization experiments and the control law evaluation experiments are techni-
cally critical also, but the number of these experiments which can be conducted
on-orblt is limited by the on-orbit test time available and the cost of developing
the associated flight software. Emphasis of these experiments can be achieved by
initially selecting a relatively large number of investigations with subsequent
competitive reduction to a relatively small number of investigations for actual
on-orbit evaluation. Competitive reduction is achieved by ground-based performance
evaluations using a high-fidelity simulation of the MAST flight article.
Percent of
Total
Experiments
I
f
#
_.-----._Competltlve
Reduction
Line
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_-_ _ _ _ ,_ D _J 0 _ ,-4 _ eL _ _
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y. A K
Y
Structural Characterization Control Law
Evaluat ion
Figure 4
324
SCHEDULE OF GUEST INVESTIGATOR PARTICIPATION
Selection of guest investigators for negotiation will be made in early 1987
with contract and grants awarded by October 1987. Those guest investigators
participating in the scaled model ground tests will have to define their test
requirements by February 1988 so that timely preparation for their participation can
be made by NASA. Likewise, participants in the flight article ground tests will
have to submit their requirements by March 1988. Guest investigators developing
algorithms for use on-orbit must submit a preliminary design by June 1988, coded in
Fortran, for competitive evaluation by NASA. Development of flight software will be
initiated by NASA for the best of the on-orbit algorithms. Analysis of flight data
will continue for approximately 1 year after the flight tests.
CY
• CONTRACT/GRANT AWARD
• SCALED MODEL TESTS
REQUIREMENTS DUE
• FLIGHT ARTICLE GROUND
TEST REQUIREMENTS DUE
• ON-ORBIT ALGORTHMS TO
LaRC FOR EVALUATION
• PREDICTIONS OF ON-ORBIT
PERFORMANCE DUE
• FLIGHT TESTS
• ANALYSIS OF FLIGHT DATA
87 88 89 I 90 92
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Figure 5
325


COFS 1 Guest Investigator Program

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