Ship Vibration
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Abstract
Excessive ship vibration can be a serious problem and lead to damage to the propulsion system, structural damage to the primary structure and damage to shipboard equipment. Even if the vibration level is not high enough to result in major damages, it can lead to crew discomfort and fatigue and increase the frequency of maintenance works for ship systems.The Auxiliary and main engine and the propeller are the principal vibration exciting sources. The hull structure responds as a both ends free beam when subjected to dynamic loads. Dynamic forces from the main and auxiliary engines are directly transmitted to the hull through their supports and foundations. Dynamic forces from the shafting system are transmitted to the hull through shaft bearings. The propeller induces fluctuating pressures on the surface of the hull. The response to this dynamic forces can cause the vibration of the ship structures and equipment. This article is not about the basic fundamental of vibration. It is focused on the causes of vibration on board ships and the reduction of vibration on ships already built.
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References
Dr. C.B. Barrass. (2004). Ship vibration. Ship design and performance for masters and mates. First edition. Elsevier Butterworth-Heinemann
Jan Babicz. (2015). Encyclopedia of ship technology. Second edition. WÄRTSILÄ CORPORATION
https://www.marineinsight.com/naval-architecture/types-of-vibrations-on-shipsmachinery-vibrations/