Journal
MARINE STRUCTURES
Volume 22, Issue 4, Pages 730-743Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2009.06.004
Keywords
Mobility; Vibration control; Ship structures; Beams; Wave confinement
Categories
Funding
- Australian Research Council
- Strategic Marine Pty. Ltd. Western Australia
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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. (C) 2009 Elsevier Ltd. All rights reserved.
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