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  • 11
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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
  • 12
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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
  • 13
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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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