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  • 1
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    Modal damping enhancement in large space structures using AMCD's (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The use of an annular momentum control device (AMCD) is proposed for enhancing the modal damping of large space structures (LSS's) during fine pointing missions. Theoretical and experimental studies proved that an AMCD cannot destabilize the LSS and that the system is asymptotically stable under certain conditions.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance and Control; 3; Sept
    Format: text
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  • 2
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    Optimal member damper controller design for large space structures (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Consideration is given to the selection of velocity feedback gains for individual dampers for the members of a structurally controlled large flexible space structure. The problem is formulated as an optimal output feedback regulator problem, and necessary conditions are derived for minimizing a quadratic performance function. The diagonal nature of the gain matrix is taken into account, along with knowledge of noise covariances. It is pointed out that the method presented offers a systematic approach to the design of a class of controllers for enhancing structural damping, which have significant potential if used in conjunction with a reduced-order optimal controller for rigid-body modes and selected structural modes.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance and Control; 3; July-Aug
    Format: text
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  • 3
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    Overview of magnetic bearing control and linearization approaches for annular magnetically suspended devices (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An overview of magnetic bearing control and linearization approaches which have been considered for annular magnetically suspended devices is presented. These devices include the Annular Momentum Control Device and the Annular Suspension and Pointing System. Two approaches were investigated for controlling the magnetic actuator. One approach involves controlling the upper and lower electromagnets differentially about a bias flux. The bias flux can either be supplied by permanent magnets in the magnetic circuit or by bias currents. In the other approach, either the upper electromagnet or the lower electromagnet is controlled depending on the direction of force required. One advantage of the bias flux is that for small gap perturbations about a fixed operating point, the force-current characteristic is linear. Linearization approaches investigated for individual element control include an analog solution of the nonlinear electromagnet force equation and a microprocessor-based table lookup method.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: An Assessment of Integrated Flywheel System Technol.; p 297-306
    Format: application/pdf
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  • 4
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    Description of a laboratory model Annular Momentum Control Device (AMCD) (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The basic concept of the Annular Momentum Control Device (AMCD) is that of a rotating annular rim suspended by noncontacting magnetic bearings and driven by a noncontacting electromagnetic spin motor. The purpose of this paper is to highlight some of the design requirements for AMCD's in general and describe how these requirements were met in the implementation of laboratory test model AMCD. An AMCD background summary is presented.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: An Assessment of Integrated Flywheel System Technol.; p 157-167
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  • 5
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    Advanced Control and Power System (ACAPS) Technology Program (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: The advanced control and power system (ACAPS) program is to establish the technology necessary to satisfy space station and related large space structures requirements for efficient, reliable, and cost effective energy storage and attitude control. Technology advances in the area of integrated flywheel systems capable of performing the dual functions of energy storage and attitude control are outlined.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Integrated Flywheel Technol., 1983; p 141-156
    Format: text
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  • 6
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    Annular Momentum Control Device (AMCD) (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-10
    Description: The Annular Momentum Control Device (AMCD) concept, applications, and advantages as a momentum storage device are discussed. A laboratory test model AMCD was designed and built. The laboratory model AMCD is described and the results of the laboratory model test phase are presented. The efforts required to complete the AMCD laboratory model test phase are outlined.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Integrated Flywheel Technol., 1983; p 123-132
    Format: text
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  • 7
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    Stability bounds for the control of large space structures (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Balas (1977) has discussed the stability problem of reduced-order regulators and estimators in terms of control and observation 'spillover'. The term 'control spillover' was used to define that part of the feedback control which excites the uncontrolled (or residual) modes, and 'observation spillover' was used to define that part of the measurement which is contaminated by residual modes. In this paper, two sufficient conditions are derived via Lyapunov methods for asymptotic stability of large space structures using a class of reduced-order controllers. These conditions give allowable bounds on the spectral norms of control and observation spillover terms. The sufficient condition given by a specified inequality equation appears to be less conservative, and should be useful as a design tool for the control of large space structures.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance and Control; 2; July-Aug
    Format: text
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  • 8
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    Implementation of a decoupled controller for a magnetic suspension system using electromagnets mounted in a planar array (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An implementation of a decoupled, single-input/single-output control approach for a large angle magnetic suspension test fixture is described. Numerical and experimental results are presented. The experimental system is a laboratory model large gap magnetic suspension system which provides five degree-of-freedom control of a cylindrical suspended element. The suspended element contains a core composed of permanent magnet material and is levitated above five electromagnets mounted in a planar array.
    Keywords: MECHANICAL ENGINEERING
    Type: Second International Symposium on Magnetic Suspension Technology, Part 1; p 257-271
    Format: application/pdf
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  • 9
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    An overview of integrated flywheel technology for aerospace application (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Space missions ranging from small scientific satellites to large manned spacecraft have, for many years, utilized systems of spinning flywheels to maintain vehicle attitude. These systems have included momentum and reaction wheels as well as control moment gyros. Extension of that technology to satisfy the additional tasks associated with energy storage has also been pursued. The combining of control and energy storage features into one system has been examined by NASA for space applications and demonstrated in the laboratory. The impact of technology advances in such areas as composite material rotors, magnetic suspensions, motor/generators, and electronics have prompted a re-evaluation of the viability of the flywheel storage system concept for aerospace applications. This paper summarizes the results of this re-examination and identifies shortfalls in the various technology areas.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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  • 10
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    Development and testing of a proposed infrared horizon scanner for use in spacecraft attitude determination (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-24
    Description: Experimental model of infrared horizon scanner for use in spacecraft attitude determination
    Keywords: NAVIGATION
    Type: NASA-TN-D-2995
    Format: application/pdf
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