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Author: search.filters.author.Song, Weon KeunSubject: search.filters.subject.Space tether

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    Experiment and analysis of a space tether with pendulum-type elastic metamaterials
    (2020-07-01)
    Yoon, Joo Young
    ;
    Song, Weon Keun
    ;
    Park, No Cheol
    In this paper, a space tether with pendulum-type elastic metamaterials is constructed as a scaled model considering initial tension of a tether cable. A similarity analysis is used to design the scaled model to ensure that it has similar dynamic characteristics as that of a real tether cable. The pendulum-type elastic metamaterials are used to produce a bandgap in the measurable frequency range. To investigate the bandgap of the metamaterials, a ground experiment that can excite the scaled model of the tether cable is proposed. The experiment results of the harmonic responses for the scaled model for external shocks indicate that the bandgap is attributed to beam resonance. The correlation between the natural frequency of the beam and the bandgap is provided, and the deformation shapes of the metamaterial in the bandgap are measured.
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    Pendulum-type elastic metamaterial for reducing the vibration of a space tether
    (2019-09-01)
    Yoon, Joo Young
    ;
    Song, Weon Keun
    ;
    Park, No Cheol
    In this paper, we present a pendulum-type elastic metamaterial that can be used to absorb the shock of a tether system. A tether system comprises a long and thin cable, so the resonant part of the elastic metamaterial should be attached to outside the cable. The unit cell of the elastic metamaterial consists of three strings and one ring, and strings are attached to the tether cable and reduces the shock transmitted to the satellite. We used modal analysis to find mode shapes of the unit cell of the elastic metamaterial that do not deform when in contact with the tether cable. A harmonic analysis on the properties of the strings confirmed the presence of bandgaps for the pendulum-type metamaterial because of the lateral resonance of the strings. The effect of the unit cell design parameters on the bandgaps were also investigated.