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  • 1
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    A readily available energy source for active vibration control in buildings (1993)
    Wiley
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    Publikationsdatum: 1993-09-01
    Beschreibung: By equipping structures with appropriate actuators, sensors and microprocessors, it is possible to suppress actively the undesirable vibrations of the structures. Due to small energy requirements, the vibration suppression in large space trusses orbiting the Earth by controlling the elongations and contractions of length‐adjustable bars of the truss has been shown to be feasible both theoretically and experimentally. This method of vibration suppression is part of the ‘adaptive structures technology’. It can be used for suppressing the vibrations of a building subjected to earthquake or wind excitations, provided that the much higher energy and power requirements are met. In this work the use of gravitational energy of the mass of the building is proposed for active vibration control. Copyright © 1993 John Wiley & Sons, Ltd
    Print ISSN: 0098-8847
    Digitale ISSN: 1096-9845
    Thema: Architektur, Bauingenieurwesen, Vermessung
    Publiziert von Wiley
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  • 2
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    Recent progress in adaptive structures for space (1997)
    Elsevier
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    Publikationsdatum: 1997-01-01
    Print ISSN: 0094-5765
    Digitale ISSN: 1879-2030
    Thema: Maschinenbau
    Publiziert von Elsevier
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  • 3
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    Adaptive truss manipulator space crane concept (1993)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Journal of Spacecraft and Rockets (ISSN 0022-4650); 30; 1; p. 111-115.
    Format: text
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  • 4
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    Control of resonant frequencies in adaptive structures by prestressing (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The natural vibration frequencies of a structure can be affected by inducing stress in the structure. The success of this kind of control of the resonant frequencies of a truss structure depends on the geometry of the structure. It is shown that in adaptive truss structures the method is effective for vibrations in less stiff directions, such as the normal direction of the plane containing all of the bars of a node, suggesting its applicability for cable, membrane, and thin plate and shell structures.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: In: Joint Japan(U.S. Conference on Adaptive Structures, 2nd, Nagoya, Japan, Nov. 12-14, 1991, Collection of Papers (A93-31226 11-18); p. 297-314.
    Format: text
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  • 5
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    Vibration suppression for large scale adaptive truss structures using direct output feedback control (1993)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: In this article, the vibration control of adaptive truss structures, where the control actuation is provided by length adjustable active members, is formulated as a direct output feedback control problem. A control method named Model Truncated Output Feedback (MTOF) is presented. The method allows the control feedback gain to be determined in a decoupled and truncated modal space in which only the critical vibration modes are retained. The on-board computation required by MTOF is minimal; thus, the method is favorable for the applications of vibration control of large scale structures. The truncation of the modal space inevitably introduces spillover effect during the control process. In this article, the effect is quantified in terms of active member locations, and it is shown that the optimal placement of active members, which minimizes the spillover effect (and thus, maximizes the control performance) can be sought. The problem of optimally selecting the locations of active members is also treated.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Journal of Intelligent Material Systems and Structures (ISSN 1045-389X); 4; 3; p. 385-397.
    Format: text
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  • 6
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    Structures that adapt to space (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: It is shown that by allowing adjustments in space, designs that incorporate adaptive structures can reduce initial precision requirements and lower costs. Present and future spacecraft structures will need enhancements in performance, reliability, testability, and cost-effectiveness; unless a structural system meets these demands, it probably will never be implemented operationally. Attention is given to the ASTREX test facility at Edwards AFB that includes embedded piezoelectric, in-line piezoelectric actuator, and magnetostrictive active members whose testbed rapidly slews the spacecraft through large angles and then points it quickly and accurately.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Aerospace America (ISSN 0740-722X); 30; 9, Se
    Format: text
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  • 7
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    Structural design for control (1993)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Recent advances in structural design for control are reviewed. Attention is given to adaptive structures, passive damping, ground testing, and system identification. Directions for future research are suggested.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: In: Flight-vehicle materials, structures, and dynamics - Assessment and future directions. Vol. 5 - Structural dynamics and aeroelasticity (A94-12676 02-39); p. 85-94.
    Format: text
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  • 8
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    Adaptive structures for precision controlled large space systems (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The development of adaptive structural systems is reviewed and the potential of these systems in meeting some of the requirements for NASA future space missions is demonstrated. Particular attention is given to the characteristics of a viscous damper in the micron displacement regime; the optimal placement of active and passive members into a truss structure; a system identification test using the active members as excitation sources; a concept for deforming a lightweight composite honeycomb optical panel to correct for on-orbit distortions by using piezoelectric actuators attached to the back facesheet; and the results of an active member vibration control experiment in a reduced gravity environment.
    Schlagwort(e): CYBERNETICS
    Materialart: Journal of Intelligent Material Systems and Structures (ISSN 1045-389X); 3; 2, Ap
    Format: text
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  • 9
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    Adaptive structures - Challenges, issues, and opportunities (1991)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Because of the precise pointing/shape control needs of future space systems coupled with a 10-20-year life requirement and very stringent limitations on system weight, a new approach to their control system design was developed. This approach, adaptive structures, exploits recent breakthroughs in advanced composite materials, sensors and actuators, and intelligent control concepts to provide an integrated structure/controller. Ground experiments, the focus of which to demonstrate and evaluate the emerging control hardware and methodologies on realistic three-dimensional testbeds, are also discussed.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: In: IEEE Conference on Decision and Control, 30th, Brighton, United Kingdom, Dec. 11-13, 1991, Proceedings. Vol. 3 (A93-13001 02-63); p. 2538-2542.
    Format: text
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  • 10
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    U.S. perspective on technology demonstration experiments for adaptive structures (1991)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Evaluation of design concepts for adaptive structures is being performed in support of several focused research programs. These include programs such as Precision Segmented Reflector (PSR), Control Structure Interaction (CSI), and the Advanced Space Structures Technology Research Experiment (ASTREX). Although not specifically designed for adaptive structure technology validation, relevant experiments can be performed using the Passive and Active Control of Space Structures (PACOSS) testbed, the Space Integrated Controls Experiment (SPICE), the CSI Evolutionary Model (CEM), and the Dynamic Scale Model Test (DSMT) Hybrid Scale. In addition to the ground test experiments, several space flight experiments have been planned, including a reduced gravity experiment aboard the KC-135 aircraft, shuttle middeck experiments, and the Inexpensive Flight Experiment (INFLEX).
    Schlagwort(e): GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Materialart: In: IEEE Conference on Decision and Control, 30th, Brighton, United Kingdom, Dec. 11-13, 1991, Proceedings. Vol. 3 (A93-13001 02-63); p. 2563-2573.
    Format: text
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