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  • Structural Mechanics  (4)
  • 2005-2009  (4)
  • 1
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    Snap-Through of Unsymmetric Laminates Using Piezocomposite Actuators (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The paper discusses the concept of using a piezoceramic actuator bonded to one side of a two-layer unsymmetric cross-ply [0/90]T laminate to provide the moments necessary to snap the laminate from one stable equilibrium shape to another. This concept could be applied to the morphing of structures. A model of this concept, which is based on the Rayleigh-Ritz technique and the use of energy and variational methods, is developed. The experimental phase of the study is discussed, including the measurement of the voltage level needed to snap the laminate. The voltage measurements and shapes are compared with predictions of the models and the agreement between measurements and the predictions are reasonable, both qualitatively and quantitatively. Suggestions for future activities are presented.
    Keywords: Structural Mechanics
    Type: Composites Science and Technology; 66; 14; 2442-2448
    Format: application/pdf
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  • 2
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    Structural Feasibility Analysis of a Robotically Assembled Very Large Aperture Optical Space Telescope (2007)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents a feasibility study of robotically constructing a very large aperture optical space telescope on-orbit. Since the largest engineering challenges are likely to reside in the design and assembly of the 150-m diameter primary reflector, this preliminary study focuses on this component. The same technology developed for construction of the primary would then be readily used for the smaller optical structures (secondary, tertiary, etc.). A reasonable set of ground and on-orbit loading scenarios are compiled from the literature and used to define the structural performance requirements and size the primary reflector. A surface precision analysis shows that active adjustment of the primary structure is required in order to meet stringent optical surface requirements. Two potential actuation strategies are discussed along with potential actuation devices at the current state of the art. The finding of this research effort indicate that successful technology development combined with further analysis will likely enable such a telescope to be built in the future.
    Keywords: Structural Mechanics
    Type: 48th Structures, Structural Dynamics and Materials Conference; Apr 23, 2007; Waikiki, HI; United States
    Format: text
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  • 3
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    Minimum mass design of large-scale space trusses subjected to thermal gradients (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Lightweight, deployable trusses are commonly used to support space-borne instruments including RF reflectors, radar panels, and telescope optics. While in orbit, these support structures are subjected to thermal gradients that vary with altitude, location in orbit, and self-shadowing. Since these instruments have tight dimensional-stability requirements, their truss members are often covered with multi-layer insulation (MLI) blankets to minimize thermal distortions. This paper develops a radiation heat transfer model to predict the thermal gradient experienced by a triangular truss supporting a long, linear radar panel in Medium Earth Orbit (MEO). The influence of self-shadowing effects of the radar panel are included in the analysis, and the influence of both MLI thickness and outer covers/coatings on the magnitude of the thermal gradient are formed into a simple, two-dimensional analysis. This thermal model is then used to size and estimate the structural mass of a triangular truss that meets a given set of structural requirements.
    Keywords: Structural Mechanics
    Type: 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics,and Materials Conference; May 01, 2006 - May 04, 2006; Newport RI; United States
    Format: text
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  • 4
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    Modal Analysis of MARS Solar Panel and Planar Vibrations (2007)
    In:  Other Sources
    Details
    Publication Date: 2019-08-26
    Description: This slide presentation reviews the modal analysis of MARS solar panels and the planar vibrations. Included are views of the solar panels mock-up assembly, a view of the test seup,a view of the plot from the test, with the raw numbers of the frequencies in Hz values with the mode number, the spatial acceleration plots of Center sub panel at resonant frequencies, predictions from the Finite element models, an explanation of the two test that were done on the plate and the results from both tests,
    Keywords: Structural Mechanics
    Type: SIRI Spring Quarter Final Presentations; Jun 15, 2007; California; United States
    Format: text
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