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Abstract of the Article

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Dry and Wet Vibration Analysis of a Metal and Composite Marine Propeller

Authors:

[ Mehdi Saeed Kiasat ] - Assistant Prof., Department of Marine Technology, Amirkabir University of Technology
[ Zahra Hatami ] - M.Sc. Engineer, Department of Marine Technology, Amirkabir University of Technology;
[ Hasan Ghasemi ] - Associate Prof., Department of Marine Technology, Amirkabir University of Technology;

Abstract:

The vibration analysis of a surface piercing propeller (SPP) is considered in this work. A surface piercing marinepropeller is used in the propulsion system of high speed vessels. This type of the propeller is commonly made fromstainless steel to withstand the severe hydrodynamic pressure condition. A novel composite propeller designed fromwoven fabric carbon/epoxy laminate is numerically analyzed for its dry and wet vibration, in addition to the steelpropeller. The effect of the water surrounding the propeller blade is mostly modeled as a mass added to the blade mass.In this work, an analytical method is applied to determine the added mass for a simple geometry vibrating in the water,in order to validate the results of the finite element method. The rotational and bending modes and their correspondingnatural frequencies of the free vibration of both composite and steel propellers in air and in water are computed todetermine the vital differences for design purposes.

Keywords:

Metal propeller, Composite propeller, Underwater vibration, Added mass, Analytical method