ABSTRACT
This chapter presents the methodology that has been used to analyze the Hull-girder vibrations induced due to propeller—rudder interaction, in the design stage of a Coastal Patrol Vessel. The hydro-vibration analysis of hull girder has become a very important methodology in the design stages of a ship, for predicting resonance problems that can be caused by the encountering wave loads, or due to the interaction between the ship’s drive line and rudder. The resulting interaction takes into consideration: the excitation of the propeller, natural frequencies of the drive line, natural frequencies of the rudder, natural frequencies of the structure of equipment foundations, added mass, and damping of both the propeller and the hull girder. There are several recommendations for the development of a Finite Element Model, especially by Classification Societies, in the present work; it was necessary to include mass and inertia of the structural elements of hull and superstructure, incorporating machinery foundations for hull girder vibration analysis.
