A study of vibration and vibration control of ship structures

T.R. Lin, Jie Pan, P.J. O'Shea, C.K. Mechefske

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    This paper examines the vibration characteristics and vibration control of complex ship structures. It is shown that input mobilities of a ship structure at engine supports, due to out-of-plane force or bending moment excitations, are governed by the flexural stiffness of the engine supports. The frequency averaged input mobilities of the ship structure, due to such excitations, can be represented by those of the corresponding infinite beam. The torsional moment input mobility at the engine support can be estimated from the torsional response of the engine bed section under direct excitation. It is found that the inclusion of ship hull and deck plates in the ship structure model has little effect on the frequency-averaged response of the ship structure. This study also shows that vibration propagation in complex ship structures at low frequencies can be attenuated by imposing irregularities to the ring frame locations in ships. Vibration responses of ship structures due to machinery excitations at higher frequencies can be controlled by structural modifications of the local supporting structures such as engine beds in ships.
    Original languageEnglish
    Pages (from-to)730-743
    JournalMarine Structures
    Volume22
    Issue number4
    DOIs
    Publication statusPublished - 2009

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    Vibration control
    Vibrations (mechanical)
    Ships
    Engines
    Decks (ship)
    Hulls (ship)
    Bending moments
    Model structures
    Frequency response
    Machinery
    Stiffness

    Cite this

    Lin, T.R. ; Pan, Jie ; O'Shea, P.J. ; Mechefske, C.K. / A study of vibration and vibration control of ship structures. In: Marine Structures. 2009 ; Vol. 22, No. 4. pp. 730-743.
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    A study of vibration and vibration control of ship structures. / Lin, T.R.; Pan, Jie; O'Shea, P.J.; Mechefske, C.K.

    In: Marine Structures, Vol. 22, No. 4, 2009, p. 730-743.

    Research output: Contribution to journalArticle

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    AB - This paper examines the vibration characteristics and vibration control of complex ship structures. It is shown that input mobilities of a ship structure at engine supports, due to out-of-plane force or bending moment excitations, are governed by the flexural stiffness of the engine supports. The frequency averaged input mobilities of the ship structure, due to such excitations, can be represented by those of the corresponding infinite beam. The torsional moment input mobility at the engine support can be estimated from the torsional response of the engine bed section under direct excitation. It is found that the inclusion of ship hull and deck plates in the ship structure model has little effect on the frequency-averaged response of the ship structure. This study also shows that vibration propagation in complex ship structures at low frequencies can be attenuated by imposing irregularities to the ring frame locations in ships. Vibration responses of ship structures due to machinery excitations at higher frequencies can be controlled by structural modifications of the local supporting structures such as engine beds in ships.

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