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Forces exciting vibrations of ship's hull and superstructure

Murawski L.

Polish Maritime Research

2005

nr 4

15-21

The paper presents identification of main excitation forces ofvibrations of ship hull and its superstructure, as well as investigation of influence of the analyzed excitation on ship vibration level. The following excitation forces were analyzed: dynamic pressure on the transom deck, propeller-generated hydrodynamic forces, as well as internal and external engine-generated forces. Rigidity and attenuation characteristics of lubricating oil film were taken into account in the analysis of the excitations transmitted by the propulsion system bearings (stern tube bearing, intermediate bearing, engine s main and thrust bearings). The dynamic characteristics of ship's power transmission system were also taken into account.Results of the analyzes were verified by comparing results of the computations and measurements.