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  • 1
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    Ultralow-Frequency Collective Compression Mode and Strong Interlayer Coupling in Multilayer Black Phosphorus (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-02-27
    Description: Author(s): Shan Dong, Anmin Zhang, Kai Liu, Jianting Ji, Y. G. Ye, X. G. Luo, X. H. Chen, Xiaoli Ma, Yinghao Jie, Changfeng Chen, Xiaoqun Wang, and Qingming Zhang The recent renaissance of black phosphorus (BP) as a two-dimensional (2D) layered material has generated tremendous interest, but its unique structural characters underlying many of its outstanding properties still need elucidation. Here we report Raman measurements that reveal an ultralow-frequency… [Phys. Rev. Lett. 116, 087401] Published Fri Feb 26, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Dynamic Analysis of a Two Member Manipulator (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Attenuating start-up and stopping vibrations when maneuvering large payloads attached to flexible manipulator systems is a great concern for many space missions. To address this concern, it was proposed that the use of smart materials, and their applications in smart structures, may provide an effective method of control for aerospace structures. In this paper, a modified finite element model has been developed to simulate the performance of piezoelectric ceramic actuators, and was applied to a flexible two-arm manipulator system. Connected to a control voltage, the piezoelectric actuators produce control moments based on the optimal control theory. The computer simulation modeled the end-effector vibration suppression of the NASA manipulator testbed for berthing operations of the Space Shuttle to the Space Station. The results of the simulation show that the bonded piezoelectric actuators can effectively suppress follow-up vibrations of the end-effector, stimulated by some external disturbance.
    Keywords: Mechanical Engineering
    Type: NASA-CR-204197 , NAS 1.26:204197
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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