In this paper we present the results obtained by numerical simulation regarding the propulsion device for boats equipped with the system of counter rotating masses discussed in Part I. The equations of motion of the systems illustrated in Part I are integrated and the performances of the propulsion are evaluated by considering a model with two pairs of counter rotating masses driven by unilobe elliptical gears. In order to evaluate the propulsive efficiency of the device, by applying the formulas previously outlined and based on the direct use of the energy equation, the powers provided and consumed by the system for obtaining a rectilinear motion are computed. The simulations have been performed with reference to a vessel CAD model whose length is approximately equal to 13 m (the previous studies, as discussed by Muscia and Sciuto 2009, 2010, Muscia 2015, considered a vessel model 1.7 m long). The stern of this vessel has a particular shape. The propulsive efficiency has been calculated with reference to a situation of steady motion. Correlations between numerical experiments on models and possible full scale application are discussed.

### Evaluation of the Efficiency of a Vibrating Propulsion System for Marine Vessels, Part II: Integration of Motion Equations and Performances

#### Abstract

In this paper we present the results obtained by numerical simulation regarding the propulsion device for boats equipped with the system of counter rotating masses discussed in Part I. The equations of motion of the systems illustrated in Part I are integrated and the performances of the propulsion are evaluated by considering a model with two pairs of counter rotating masses driven by unilobe elliptical gears. In order to evaluate the propulsive efficiency of the device, by applying the formulas previously outlined and based on the direct use of the energy equation, the powers provided and consumed by the system for obtaining a rectilinear motion are computed. The simulations have been performed with reference to a vessel CAD model whose length is approximately equal to 13 m (the previous studies, as discussed by Muscia and Sciuto 2009, 2010, Muscia 2015, considered a vessel model 1.7 m long). The stern of this vessel has a particular shape. The propulsive efficiency has been calculated with reference to a situation of steady motion. Correlations between numerical experiments on models and possible full scale application are discussed.
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2015
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/11368/2846030`
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