PODENZANA BONVINO , Carlo

From a theoretical point of view, the probabilistic approach can be considered a more suitable methodology to address the safety problem of a damaged ship, because it permits to analyze the ship characteristics and the damage scenario in a more specific way, offering rational model for assessing the survivability of the ship. Some significant...

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In present work, the application of previously developed semiempirical regression formulae for the prediction of fast twin screw ships manoeuvrability is shown, considering the test case of the 5415 naval ship. Results in terms of standard manoeuvres macroscopic parameters and also of forces in PMM-like tests are reported, showing the...

Research studies about hydrodynamic performance of trimaran hull configurations and their application to real ship design, are relatively recent, having generally appeared in the last two decades of the last century, without relevant follow up in the shipbuilding world. The proposed paper aims to describe the main features of the hydrodynamic...

The paper continues and completes the publication of a series of towing tank tests initiated several years ago in the frame of an interuniversity project partially supported by the Ministry of Education, University and Research among the Universities of Genova, Napoli and Trieste. Two equivalent hull designs have been designed to be suitable...

The School of Naval Architecture and Marine Engineering in Genoa started its activity in 1870 as 'Royal School of Naval Architecture and Marine Engineering' with the aim to increase the scientific knowledge of ship designers and ship engineers for both the Italian Navy and the Italian merchant marine. At the moment the University of Genoa has...

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This paper addresses the problem of the numerical evaluation of the forces exerted by rudder/propeller complex; in particular, considering the common framework of RANS computations, different possible approximations of the propeller effect are taken into account, starting from the simplest uniform actuator disk and moving successively to an...

The paper deals with experimental towing task tests of two equivalent multihull fast ships: the same main hull in trimaran and pentamaran configuration. An extensive set of model tests results, performed at the University of Genova on a 2m long model (1:50 scale), are presented in terms of total resistance and dynamic attitude at different...

Interest in ship manoeuvrability has increasingly grown during last decades, both for merchant and naval ships; resulting in the adoption by IMO of RESOLUTION MSC137(76) and in publication by NATO of ANEP 70. Ship manoeuvrability characteristics estimation is strongly related to the accuracy in determination of the hydrodynamic coefficients...

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In the present work the phenomenon of asymmetrical shaft power increase during tight maneuvers is investigated by means of the analysis of turning circle maneuvers at different speeds and rudder angles performed during sea trials for a series of twin screw naval ships; this analysis has allowed to underline a common trend for asymmetrical shaft...

Assessment of the influence on the resistance of the hull configuartion of a fast trimaran

A comprehensive approach to modelling and simulation of high speed craft dynamics during turning circle and zig-zag manoeuvres is presented in this paper. The high performance requirements for propulsion systems and the increasing attention being paid to planing hull manoeuvring features suggest the need for a thorough investigation into ship...

In the present work the phenomenon of asymmetrical shaft power increase during tight manoeuvres is investigated by means of the analysis of turning circle manoeuvres at different speeds and rudder angles performed during sea trials for a series of twin screw naval ships; a common trend for shaft power increase has been found, and possible...

Interest in ship manoeuvrability has increasingly grown during last decades, both for merchant and naval ships resulting in the adoption by IMO of RESOLUTION MSC137 (76) and in publication by NATO of ANEP 70. Ship manoeuvrability characteristics prediction is strongly related to the accuracy in determination of the hydrodynamic coefficients...

A comprehensive approach to model and simulate high speed craft dynamics during turning circles and zig-zag manoeuvres is presented in this paper. The high performance requirements for propulsion systems and the increasing attention on manoeuvring features suggest the need for a thorough investigation about planing hull dynamics, already in the...

The problem of ship manoeuvrability has increasingly grown in consideration in the last decade, both for merchant and naval ships. With regards to merchant ships, the adoption by IMO of the RESOLUTION A.751(18) in 1993 [1] established minimum manoeuvrability standards to grant safety for all seagoing ships. With regards to naval ships, a...

This paper presents the preliminary analyses devoted to the development of a new fast-craft concept, different from typical off-shore crafts, able to reach very high speed despite its main dimensions and displacement. In particular, the analysis is focused on "deep V hull shapes" of overall length of about 40 m and a range of operative speeds...