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  • 1
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    Robust control of an active precision truss structure (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A description is given of the efforts in control of an active precision truss structure experiment. The control objective is to provide vibration suppression to selected modes of the structure subject to a bandlimited disturbance and modeling errors. Based on performance requirements and an uncertainty description, several control laws using the H-infinity optimization method are synthesized. The controllers are implemented on the experimental facility. Preliminary experimental results are presented.
    Keywords: CYBERNETICS
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  • 2
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    Adaptive structures (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Current research in the field of advanced adaptive structures for space applications is reviewed. A classification of adaptive structures is proposed whereby such structures are subdivided into adaptive, sensory, controlled, active, and intelligent structures. The definition and properties of each type of adaptive structures are presented, and methods of structure control are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Intelligent Material Systems and Structures (ISSN 1045-389X); 1; 157-174
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  • 3
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    Stiffness control of large space structures (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A method of using internal force producing dual element/actuators for vibration suppression of large space structures is proposed. This technique is applied to a vibrating string as well as a low order system. Response feedback control for the vibrating string and selected modal control are used for achieving the modal damping. The actuators used in this method may be electrically powered and are suitable for structures with extremely low rigidity.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 4
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    Positive position feedback control for large space structures (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA Journal (ISSN 0001-1452); 28; 717-724
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  • 5
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    Adaptive structures in space (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Future NASA missions will need large (20 to 100m) structural systems with precision position (few microns to submicron) requirements. Data are presented which indicate the technology deficiencies of previous programs and analyses in current state-of-the-art structural design approaches, analytical prediction capabilities, control of structure capabilities, and ground test technologies to meet the performance requirements of future large precision structural systems. Test results on laboratory truss structures that demonstrate static displacement control, active damping, and on-orbit system identification are described. It is shown that for large precision structures, adaptive structures provide not only a means to achieve the precision and characteristics required in space, but can also significantly alleviate the ground test requirements for flight-validating the hardware.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 6
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    Stiffness control of large space structures (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A method of using internal force producing dual element/actuators for vibration suppression of large space structures is proposed. The technique is applied to a vibrating string and to a low order system. Response feedback control for the vibrating string and selected modal control are used for achieving the modal damping. The actuators may be electrically powered and are suitable for structures with extremely low rigidity.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: DGLR The 2nd International Symposium on Aeroelasticity and Structural Dynamics; p 368-373
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  • 7
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    Structural control by the use of piezoelectric active members (1987)
    In:  CASI
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    Publication Date: 2013-08-31
    Description: Large Space Structures (LSS) exhibit characteristics which make the LSS control problem different form other control problems. LSS will most likely exhibit low frequency, densely spaced and lightly damped modes. In theory, the number of these modes is infinite. Because these structures are flexible, Vibration Suppression (VS) is an important aspect of LSS operation. In terms of VS, the control actuators should be as low mass as possible, have infinite bandwidth, and be electrically powered. It is proposed that actuators be built into the structure as dual purpose structural elements. A piezoelectric active member is proposed for the control of LSS. Such a device would consist of a piezoelectric actuator and sensor for measuring strain, and screwjack actuator in series for use in quasi-static shape control. An experiment simulates an active member using piezoelectric ceramic thin sheet material on a thin, uniform cantilever beam. The feasibility of using the piezoelectric materials for VS on LSS was demonstrated. Positive positive feedback as a VS control strategy was implemented. Multi-mode VS was achieved with dramatic reduction in dynamic response.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-Langley Research Center NASA(DOD Control)Structures Interaction Technology, 1986; p 809-829
    Format: application/pdf
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  • 8
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    Recent results on structural control of an active precision structure (1991)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: This paper describes recent results in structural control of an active precision truss structure at JPL. The goal is to develop practical control methodology and to apply to active truss structures intended for high precision space-based optics applications. The active structure considered incorporates piezoelectric active members which apply control forces internal to the structure and thereby improve the structure's dimensional stability. Two approaches to structural control system design were investigated. The first approach uses only noncollocated measurements of acceleration at the location of a simulated optical component to achieve structural stabilization. The second approach is essentially the same as the first one except that a viscous damper was used in place of a truss member on the structure to improve the dampings of selected flexible modes. The corresponding experimental closed-loop results are presented in this paper.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 91-2693
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  • 9
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    Adaptive structures to meet future requirements for large precision structures (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The role of adaptive structures in meeting the structural requirements for future NASA missions is described. Many of NASA's future missions require large precision truss type structures where prespecified locations on the structure must maintain micron level accuracies with respect to each other when subjected to manufacturing errors and static, thermal, and dynamic inputs. In many cases the incorporation of the adaptive structures concepts into the structural design to adjust the on-orbit structure will be the only feasible means to attain the desired accuracies. In order for the structures to be able to change structural characteristics on orbit they must be uncoupled and independent of the control system used to impart the required rigid body motion to the spacecraft.
    Keywords: STRUCTURAL MECHANICS
    Type: ESA, Spacecraft Structures and Mechanical Testing; p 121-126
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  • 10
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    Stiffness Control of Large Space Structures (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-20
    Description: A technique for using internal force producing dual element/actuators for vibration suppression of large space structures is proposed. The method is applied to a low order system. Selective modal damping is achieved. The actuators used in this method may be electrically powered. The method is suitable for structures which are too slender or flimsy to permit the use of reaction jet-type actuators.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Proc. of the Workshop on Identification and Control of Flexible Space Struct., Vol. 2; p 351-364
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