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  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (9)
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  • 1
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    A hardware demonstration of distributed control for a flexible offset-feed antenna (1985)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: A fully instrumented hardware model of a flexible offset-feed antenna has been constructed for laboratory tests. Three rate gyros, four angular position laser sensors, and a set of ten distributed accelerometers are used to rconstruct the antenna state. Three control moment gyros are used to simultaneously orient the antenna, and to maintain a stable line of sight. A description is presented of the distributed antenna control system and experimental results.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: JPL Proc. of the Workshop on Identification and Control of Flexible Space Struct., Vol. 1; p 253-268
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  • 2
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    Hardware verification of distributed/adaptive control (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Adaptive control techniques are studied for their future application to the control of large space structures, where uncertain or changing parameters may destabilize standard control system designs. The approach used is to examine an extended Kalman filter estimator, in which the state vector is augmented with the unknown parameters. The associated Riccatti equation is linearized about the case of exact knowledge of the parameters. By assuming that parameter variations occur slowly, the filter complexity is reduced further yet. Simulations on a two degree-of-freedom oscillator demonstrate the parameter-tracking capability of the filter, and an implementation on the JPL Flexible Beam Facility using an incorrect model shows the adaptive filter/optimal control to be stable where a standard Kalman filter/optimal control design is unstable.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Proc. of the Workshop on Appl. of Distributed System Theory to the Control of Large Space Struct.; p 337-350
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  • 3
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    Adaptive Filtering for Large Space Structures: A Closed-Form Solution (1985)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: In a previous paper Schaechter proposes using an extended Kalman filter to estimate adaptively the (slowly varying) frequencies and damping ratios of a large space structure. The time varying gains for estimating the frequencies and damping ratios can be determined in closed form so it is not necessary to integrate the matrix Riccati equations. After certain approximations, the time varying adaptive gain can be written as the product of a constant matrix times a matrix derived from the components of the estimated state vector. This is an important savings of computer resources and allows the adaptive filter to be implemented with approximately the same effort as the nonadaptive filter. The success of this new approach for adaptive filtering was demonstrated using synthetic data from a two mode system.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: JPL Proc. of the Workshop on Identification and Control of Flexible Space Struct., Vol. 3; p 161-173
    Format: application/pdf
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  • 4
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    Experimental demonstration of the control of flexible structures (1984)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The Large Space Structure Technology Flexible Beam Experiment employs a pinned-free flexible beam to demonstrate such required methods as dynamic and adaptive control, as well as various control law design approaches and hardware requirements. An attempt is made to define the mechanization difficulties that may inhere in flexible structures. Attention is presently given to analytical work performed in support of the test facility's development, the final design's specifications, the control laws' synthesis, and experimental results obtained.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 7; 527-534
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  • 5
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    Spacecraft drag-free technology development: On-board estimation and control synthesis (1982)
    In:  CASI
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    Publikationsdatum: 2019-06-28
    Beschreibung: Estimation and control methods for a Drag-Free spacecraft are discussed. The functional and analytical synthesis of on-board estimators and controllers for an integrated attitude and translation control system is represented. The framework for detail definition and design of the baseline drag-free system is created. The techniques for solution of self-gravity and electrostatic charging problems are applicable generally, as is the control system development.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-CR-169141 , JPL-Pub-82-45 , NAS 1.26:169141
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  • 6
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    Distributed control of large space structures (1981)
    In:  CASI
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    Publikationsdatum: 2019-06-28
    Beschreibung: Theoretical developments and the results of laboratory experiments are treated as they apply to active attitude and vibration control, as well as static shape control. Modern control theory was employed throughout as the method for obtaining estimation and control laws.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-CR-164365 , JPL-PUB-81-15
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  • 7
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    Closed-loop control performance sensitivity to parameter variations (1983)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: Previously cited in issue 19, p. 2994, Accession no. A82-38877
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: (ISSN 0731-5090)
    Format: text
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  • 8
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    Closed loop control performance sensitivity to parameter variations (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: A very efficient technique for computing the closed loop performance sensitivities to parameter variations of a dynamic system with a reduced order controller has been developed. The eigensystem of the closed loop system is computed once. With this information, the closed loop filter and state rms responses, and the first and second derivatives of these rms values with respect to given parameters are computed. Detailed numerical examples using the JPL flexible beam and a 55 meter offset fed, wrap-rib antenna are included.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: AIAA PAPER 82-1440 , Astrodynamics Conference; Aug 09, 1982 - Aug 11, 1982; San Diego, CA
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  • 9
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    Optimal local control of flexible structures (1979)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: The steady state solution of the linear quadratic optimal control problem with the constraint that only partial state information is available for feedback is derived. This development results in a systematic and computationally efficient approach for reducing the complexity of the control law for high order systems. Numerical examples and performance evaluation of (1) a simple fourth order system, and (2) a free-free flexible beam, are included.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: AIAA PAPER 79-1740 , Guidance and Control Conference; Aug 06, 1979 - Aug 08, 1979; Boulder, CO
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