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  • 1
    Electronic Resource
    Electronic Resource
    A multi-dimensional constitutive model for shape memory alloys (1992)
    Springer
    Journal of engineering mathematics 26 (1992), S. 429-443 
    Details
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract This paper presents a multi-dimensional thermomechanical constitutive model for shape memory alloys (SMAs). This constitutive relation is based upon a combination of both micromechanics and macromechanics. The martensite fraction is introduced as a variable in this model to reflect the martensitic transformation that determines the unique characteristics of shape memory alloys. This constitutive relation can be used to study the complex behavior associated with 2-D and 3-D SMA structures. A simple example using this constitutive model is also presented, which reveals a new and interesting phenomenon of 3-D SMA structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042744
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Topological Properties of Banach Spaces (1993)
    Oxford University Press
    Details
    Publication Date: 1993-05-01
    Print ISSN: 0024-6115
    Electronic ISSN: 1460-244X
    Topics: Mathematics
    Published by Oxford University Press
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    PAPER CURRENT
  • 3
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    LATTICE POINTS (Pitman Monographs 39) (1990)
    Oxford University Press
    Details
    Publication Date: 1990-07-01
    Print ISSN: 0024-6093
    Electronic ISSN: 1469-2120
    Topics: Mathematics
    Published by Oxford University Press
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    PAPER CURRENT
  • 4
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    Vibrational behavior of adaptive aircraft wing structures modelled as composite thin-walled beams (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The vibrational behavior of cantilevered aircraft wings modeled as thin-walled beams and incorporating piezoelectric effects is studied. Based on the converse piezoelectric effect, the system of piezoelectric actuators conveniently located on the wing yield the control of its associated vertical and lateral bending eigenfrequencies. The possibility revealed by this study enabling one to increase adaptively the eigenfrequencies of thin-walled cantilevered beams could play a significant role in the control of the dynamic response and flutter of wing and rotor blade structures.
    Keywords: COMPOSITE MATERIALS
    Type: FAA, Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design, Volume 1; p 361-38
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Mission to Planet Earth technology assessment and development for large deployable antennas (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A NASA R&D program, the Large Deployable Antenna program, was initiated to investigate and demonstrate the availability of critical technologies for passive microwave imagers. The science objectives, current state-of-the-art, a number of electromagnetic configurations under consideration, and the mechanical systems development effort are presented. The program team conducted a detailed technology review, evaluated the feasibility and technology readiness for a large dual-reflector radiometer, and developed a system concept for a 25-meter deployable radiometer. The study approach involved determining basic operational parameters and configurations for a geosynchronous wide-scanning radiometer from which specific structural requirements were utilized as goals (rather than specifications) with which specific technologies could be evaluated.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IAF PAPER 90-051
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Active structural acoustic control with smart structures (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: This paper is concerned with a discussion of recent research at VPI&SU in the area of active structural acoustic control. The material is divided into progress in the areas of structural acoustics, actuators, sensors, and control approaches. However, due to the coupled nature of the problem, considerable effort throughout the program has been given to the interaction of these areas with each other. The results presented show that significant progress has been made toward controlling structurally radiated noise by active/adaptive means applied directly to the structure.
    Keywords: ACOUSTICS
    Type: Fiber Optic Smart Structures and Skins II; Sept. 5-8, 1989; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Control of sound radiation with active/adaptive structures (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Recent research is discussed in the area of active structural acoustic control with active/adaptive structures. Progress in the areas of structural acoustics, actuators, sensors, and control approaches is presented. Considerable effort has been given to the interaction of these areas with each other due to the coupled nature of the problem. A discussion is presented on actuators bonded to or embedded in the structure itself. The actuators discussed are piezoceramic actuators and shape memory alloy actuators. The sensors discussed are optical fiber sensors, Nitinol fiber sensors, piezoceramics, and polyvinylidene fluoride sensors. The active control techniques considered are state feedback control techniques and least mean square adaptive algorithms. Results presented show that significant progress has been made towards controlling structurally radiated noise by active/adaptive means applied directly to the structure.
    Keywords: ACOUSTICS
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 157; 1 Au
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Design of a Shape Memory Alloy deployment hinge for reflector facets (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A design concept for a Shape Memory Alloy (SMA) actuated hinge mechanism for deploying segmented facet-type reflector surfaces on antenna truss structures is presented. The mechanism uses nitinol, a nickel-titanium shape memory alloy, as a displacement-force micro-actuator. An electrical current is used to resistively heat a 'plastically' elongated SMA actuator wire, causing it to contract in response to a thermally-induced phase transformation. The resulting tension creates a moment, imparting rotary motion between two adjacent panels. Mechanical stops are designed into the device to limit its range of motion and to establish positioning accuracy at the termination of deployment. The concept and its operation are discussed in detail, and an analytical dynamic simulation model is presented. The model has been used to perform nondimensionalized parametric design studies.
    Keywords: MECHANICAL ENGINEERING
    Type: AIAA PAPER 91-1162 , AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference; Apr 08, 1991 - Apr 10, 1991; Baltimore, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
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