1,721,056 research outputs found
Higher education in Marine Technology at Genova University
No full textThe Department of Naval Architecture and Marine Engineering 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. Since that time the teaching and research activities grew up in close relationship with the regional economic maritime sector. Recently the topics related to small ships and pleasure crafts were added to the traditional courses in the new University campus in La Spezia. At the moment the University of Genova offers two degrees of 3 years (BSc), two of 2 years (MSc) and one PhD course in topics related to Marine Technology. The number of students per year is about 550 in Genoa and 150 in La Spezia. The Department has close relationships with Italian and foreign industries, universities, research centres and we believe that the increase of teaching and research partnerships will produce great benefits for the students and also for the organisation. We think that the crucial point to increase relationships is a better knowledge of the education systems of the other EU countries and countries all over the world. This is the motivation of this paper for the RINA Conference on Higher Education in Marine Technology. © 2006: Royal Institution of Naval Architects
A design framework for combined marine propulsion control systems: From conceptualisation to sea trials validation
No full textThe ship's dynamic performance (acceleration, turning ability, crash stop) strongly depends on both the propulsion system and its control. The steady-state performance analysis of propulsion systems has shown that onboard energy usage benefits from the employment of simulation techniques. Besides, these techniques provide significant advantages in designing the control logic of sophisticated and complex systems. The present work summarizes the research activities conducted to develop suitable simulation framework for the propulsion systems of naval vessels. Theoretical and mathematical models have thus been developed in this paper to simulate the propulsion of ships. Model-scale experiments and full-scale trials have been used to increase the fidelity of the models. The research outcome is a conceptual framework and a fully validated parametric software representing the vessel's dynamic behaviour and propulsion system in steady-state and abrupt manoeuvres. Thanks to this simulation framework, the propulsion control system could be designed, validated, and calibrated before its installation on board, reducing the commissioning time and minimising the propulsion control system's onboard calibration during the acceptance sea trials
Fuel consumption and exhaust emissions reduction by dynamic propeller pitch control
No full textThe aim of this paper is to focus attention on how a proper control strategy can save both: fuel consumption and exhaust emissions. A ship with a Controllable Pitch Propeller, driven by a diesel engine or a gas turbine, is traditionally controlled via the "combinator" that set a proper combination of pitch and shaft speed depending on the bridge telegraph (lever) position. The propulsion control based on a 'static' combinator curve does not assure the best use of the propulsion system in terms of power, consumption and emissions. The idea proposed here is to shift from the classic paradigm of 'static' combinator curve (or curves) to a 'dynamic set point' of the propulsion plant. A 'ship performance code' has been developed and used to evaluate the potential benefit of the adoption of the 'dynamic set point' control scheme with respect to the traditional 'combinator' control scheme. Some simulations have been performed and results compared with full scale data measured during normal ship service. The technological implementation seems straightforward, at the present state of the art, for what the automation (propulsion controllers) is concerned, instead, it will probably require some improvements for what the pitch control system is concerned. © 2009 Taylor & Francis Group, London
Grife, Nouvelles technologies et formation des formateurs à l'analyse des besoins, par G. Figari, M. Vigezzi, D. Chevrolet et M. Frossard, Grife, Grenoble, 1986
No full textMeunier Françoise. Grife, Nouvelles technologies et formation des formateurs à l'analyse des besoins, par G. Figari, M. Vigezzi, D. Chevrolet et M. Frossard, Grife, Grenoble, 1986. In: Formation Emploi. N.15, 1986. pp. 109-110
Effects of fuel quality on two strokes slow speed diesel engines
No full textCorrect management of fuel supply involves commercial, technical and safety implications. This paper deals with malfunctions of two strokes slow speed Diesel engines and related wearing effects on cylinder liners caused by inappropriate fuel quality. Combustion process of fuels has been examined, highlighting parameters giving malfunctioning and wearing effects. Relationship between characteristics of fuels and damages are quite complex and malfunctions explanations are seldom clear and unique. However, the present work sets an interpretation key of involved phenomena. A sequence of events, linked by cause-effect relationships, is proposed, which is able to explain how the fuel viscosity and some related parameters could wear the engine cylinder liners and cause malfunctions. Such general scheme is supported by numerical simulations and applied to a case study. Mathematical models relevant to single steps of the process, available in literature, have been calibrated in order to obtain results in agreement with experimental data. © 2005 Taylor & Francis Group
Parametric study of the influence of the wind assisted propulsion on ships
No full textnologies to increase energy efficiency and reduce ship fuel consumption. Several measures have been identified, or even applied, with the potential to achieve substantial fuel consumption and emission reductions, like slow-steaming, bio-fuels, and alternative propulsion technologies. Slow steaming has been already analysed to a great extent, whereas biofuels have raised concerns about environmental impact and availability. Among alternative propulsion technologies, a resurgence in wind-assisted propulsion is observed in recent years, primarily due to its high potential for fuel consumption and emission reduction. Wind power is currently being developed through both conventional sails and modern alternatives. These include Flettner rotors, kites or spinnakers, soft sails, wing sails and wind turbines. In particular, Flettner rotors are rotating cylinders generating lift when immersed in a fluid stream. This paper presents a ship propulsion model study, able to account for the thrust force produced by the rotor accounting for different vessel speed and weather scenario. This paper aims to assess the improvement of the ship’s energy efficiency and optimise the ship operating conditions in terms of daily performance. The result clearly shows the potential reduction achieved in the propeller delivered power given using the rotor as an auxiliary propulsion device
CODLAW Ship Propulsion Simulation: Performance Optimization by Smart Control
No full textThe paper presents an integrated simulation study aimed at ship’s performance prediction, during both
sailing and motor propulsion, for a Combined Diesel eLectric and Wind (CODLAW) propulsion plant
installed on board of the illustrious tall ship “Amerigo Vespucci”. The ship, recently interested by a
complete platform system revamping, will be equipped with the most innovative IFEP plant
(Integrated Full Electric Propulsion), still preserving the rigs to honour the seafaring tradition. The
study is focused on the behaviour of the new electric propulsion motor, driving the fixed pitch
propeller, during sailing navigation condition, and in particular on the negative effect of the trailing
propeller. A newly developed control system will drive the propeller to the “zero thrust” mode during
sailing, for several wind conditions, in order to optimize the ship performance. Feasibility and benefits
of this propulsion option are investigated through a motor – sailing propulsion simulator, developed in
the MatLab-Simulink environment, and off-line CFD analysis carried out for the evaluation of the soft
sails aerodynamics
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