BENVENUTO , Giovanni Battista

Abstract: Ship dynamics and propulsion numerical simulator, developed at the University of Genova and already tested with reference to different ship types, is applied to a small naval unit, for which various experimental tests results are known both in model and full scale. In particular, the paper is focused on the validation of the...

This paper presents a computer simulation model able to predict the dynamic behaviour of a whole marine propulsion system and to evaluate the influence of its three main elements: ship, propeller and prime mover. The developed procedure, which takes into account the complex interactions between the various plant components, can represent the...

Abstract: The paper presents a mathematical model for the dynamic analysis of turbocharged diesel engines for use in computer simulations of ship propulsion plants. The engine description is based on a two-zone combustion model which allows a detailed calculation of the thermodynamic processes inside the cylinders and an evaluation of exhaust...

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Abstract: In the paper the dynamic performance analysis of a gas turbine/waterjet propulsion system for a fast trimaran ferry is presented and discussed. The adopted technique is the computer simulation, for which a complex mathematical model, characterised by a modular arrangement, has been suitably developed. The model consists of several...

Abstract: The gas turbine plants, thanks to their superior power density in comparison with other thermal engines (i.e. diesel engines), represent an appreciated and competitive typology of prime movers, of particular interest for the propulsion systems of high speed marine vehicles, typically based on both propeller and waterjet...

Abstract: The paper reports and discusses the results obtained by the application of a theoretical simulation to a sequentially turbocharged marine diesel engine, with the aim to predict the transient variation of some in-cylinder and overall parameters as a consequence of the engine speed and load variation. The simulation model is applied to...

Abstract: Turbocharged diesel engines are the most used prime mover in the ship propulsion plants, because of their superior power density and efficiency as compared to other thermal engines. So perfect efficiency and reliability of these engines is very important for ship safety and economy of navigation. For this reason, many papers are...

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Abstract: The paper presents an original modular mathematical model, based on physical laws, for the dynamic simulation of open cycle gas turbine (GT) plants, specifically developed for ship propulsion plants studies. Each gas turbine component (i.e. compressor, turbine, combustor) is modelled in a specific module, by means of time dependent...

Abstract: In the paper a generalized performance map for mixed flow pumps currently in use in waterjet propulsors is proposed. It is derived from the observation of a number of performance maps of typical waterjet pumps, and from fluid-dynamic and similitude principles of the hydraulic machines. The mixed flow pump map here proposed, showing...

Abstract: In the marine field, the request of high performance diesel engines rises from the wish of improving the ship transport capacity and speed. Nowadays high supercharged diesel engines are developed, characterised by increasing values of b.m.e.p. (brake mean effective pressure), not only at design conditions, but also at part load...

ABSTRACT: In a CODAD propulsion plant configuration, with two diesel engines assigned to a shaft line, the power balancing between the two diesel engines is managed by the propulsion plant governor mainly by equally distributing the fuel mass flow between the two engines, without verifying the effective power delivered by each engine. If one of...

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Abstract: The paper presents a criterion for the acceleration performance improvement of vessels whose propulsion system consists of a gas turbine/waterjet combination. The criterion is developed and tested by means of computer simulation, through a complex mathematical model applied here to a fast trimaran ferry. The model consists of...

Abstract: The sequential turbocharging technique is used to improve the performance of highly rated diesel engines in particular at part loads. However, the transient behaviour of the sequential turbocharging connection/disconnection phases may be difficult to calibrate and requires an accurate study and development. This may be accomplished,...

Abstract: Various methods are proposed in literature for the engine faults detection, based on the combination of simulation models with measured engine data. In order to be effective, these methods must be based, in author's opinion, on detailed, reliable and validated simulation models, able to predict the faulty engine performance, by...

ABSTRACT: the propulsion plant is a vital component of the ship for both naval and commercial vessels. Despite the importance of the component, design methodologies are not widely covered in public literature. Propulsion plant behavior is a key aspect of the ship overall behavior for safety as well for commercial aspects. The authors present an...

Abstract: Linear alternators are frequently proposed and used as electric-energy-producing devices in connection with free-piston Stirling engines. However, while considerable research work has been done on this type of engine and on its dynamics and thermodynamics, there are only few studies dealing with the linear alternator and its...

Abstract: A coupled electric, dynamic, and thermodynamic analysis, developed by the authors for free-piston Stirling engine/linear alternator systems and reported in the first part of this study, is applied here to an existing and operating plant in order to satisfy the following objectives: firstly, to test its capability to predict the...

Abstract: In this paper a new linearization technique of the dynamic balance equations of a free-piston Stirling machine is developed. It takes into account the non-linear thermo-fluid-dynamic terms inherent in the machine, while keeping the linearity of the differential dynamic equations. This allows the equations of motion to be solved...

Abstract: In spite of the conceptual simplicity, the design of the free-piston Stirling engines (FPSEs) is made difficult by the necessity to accurately foresee the effect of the various geometric, dynamic, and thermodynamic variables on their behavior. This paper describes a fully developed mathematical model able to characterize these...

Abstract: The paper presents the concept design of a high speed commercial vessel based on the trimaran configuration. The adopted solution represents an interesting and promising alternative to the existing and recently built monohull or catamaran ferries. The study has been focused on the application of the trimaran to the case of ro/ro-pax...

This paper presents mathematical models for the dynamic simulation of a planning craft and a waterjet propulsion system. The models, developed in a Matlab-Simulink software environment, are structured in modular form, in order to describe the various elements of the system as individuals blocks (hull, prime mover, gear, waterjet, etc.), taking...