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  • 1
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    Description of the Spacecraft Control Laboratory Experiment (SCOLE) facility (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A laboratory facility for the study of control laws for large flexible spacecraft is described. The facility fulfills the requirements of the Spacecraft Control Laboratory Experiment (SCOLE) design challenge for a laboratory experiment, which will allow slew maneuvers and pointing operations. The structural apparatus is described in detail sufficient for modelling purposes. The sensor and actuator types and characteristics are described so that identification and control algorithms may be designed. The control implementation computer and real-time subroutines are also described.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Proceedings of the 3rd Annual SCOLE Workshop; p 413-458
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Finite element model of SCOLE laboratory configuration (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Spacecraft Control Laboratory Experiment (SCOLE) is defined by element properties: material constants; mast, reflector, rigid links as beam elements; cable as bar element; and space shuttle as very stiff beam. Two boundary conditions are modeled: suspended (6 degrees of freedom for all joints except the top of the cable) and cantilevered cables (shuttle platform fixed in all degrees of freedon). Calculations include stiffness and mass matrices, initial stresses, static displacements and reactions, and eigensolutions.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Proceedings of the 3rd Annual SCOLE Workshop; p 149-162
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Controls-structures-electromagnetics interaction program (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A technology development program is described involving Controls Structures Electromagnetics Interaction (CSEI) for large space structures. The CSEI program was developed as part of the continuing effort following the successful kinematic deployment and RF tests of the 15 meter Hoop/Column antenna. One lesson learned was the importance of making reflector surface adjustment after fabrication and deployment. Given are program objectives, ground based test configuration, Intelsat adaptive feed, reflector shape prediction model, control experiment concepts, master schedule, and Control Of Flexible Structures-II (COFS-II) baseline configuration.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA(DOD Control)Structures Interaction Technology, 1986; p 701-715
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Slew maneuvers on the SCOLE Laboratory Facility (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Spacecraft Control Laboratory Experiment (SCOLE) was conceived to provide a physical test bed for the investigation of control techniques for large flexible spacecraft. The control problems studied are slewing maneuvers and pointing operations. The slew is defined as a minimum time maneuver to bring the antenna line-of-sight (LOS) pointing to within an error limit of the pointing target. The second objective is to rotate about the LOS within the 0.02 degree error limit. The SCOLE problem is defined as two design challenges: control laws for a mathematical model of a large antenna attached to the Space Shuttle by a long flexible mast; and a control scheme on a laboratory representation of the structure modelled on the control laws. Control sensors and actuators are typical of those which the control designer would have to deal with on an actual spacecraft. Computational facilities consist of microcomputer based central processing units with appropriate analog interfaces for implementation of the primary control system, and the attitude estimation algorithm. Preliminary results of some slewing control experiments are given.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA(DOD Control)Structures Interaction Technology, 1986; p 851-867
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Status report and preliminary results of the spacecraft control laboratory experiment (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Spacecraft Control Laboratory Experiment (SCOLE) was conceived to provide a physical test bed for investigation of control techniques for large flexible spacecraft. The SCOLE problem is defined as two design challenges. The first challenge is to design control laws for a mathematical model of a large antenna attached to the space shuttle by a long flexible mast. The second challenge is to design and implement a control scheme on a laboratory representation of the structure modelled in the first part. Control sensors and actuators are typical of those which the control designer would have to deal with on an actual spacecraft. The primary control processing computer is representative of the capacity and speed which may be expected in actual flight computers. A brief description is given of the laboratory apparatus along with some preliminary results of structural dynamics tests and actuator effectiveness tests.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Marshall Space Flight Center Structural Dynamics and Control Interaction of Flexible Structures; p 359-398
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Description of the Spacecraft Control Laboratory Experiment (SCOLE) facility (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A laboratory facility for the study of control laws for large flexible spacecraft is described. The facility fulfills the requirements of the Spacecraft Control Laboratory Experiment (SCOLE) design challenge for laboratory experiments, which will allow slew maneuvers and pointing operations. The structural apparatus is described in detail sufficient for modelling purposes. The sensor and actuator types and characteristics are described so that identification and control algorithms may be designed. The control implementation computer and real-time subroutines are also described.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TM-89057 , NAS 1.15:89057
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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