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A Fuzzy - Neuron Model of the Ship Propulsion Risk Prediction
A prediction model is presented of the ship propulsion risk, i.e. a risk of the consequences of loss of the ship propulsion capability. This is an expert model based on opinions elicited by the ship power plant operators. The risk level depends, among other things, on the reliability state of the ship propulsion system components. This state is defined by operators in a linguistic form. The formal risk model parameters are determined by means of a neural network.
The article presents possible application of the theory of semi-Markov processes in creating the eight-state model of the process of appearance of the propulsion systems ability and inability states on sea-going vessels performing transportation tasks in a relatively long operating time t (t → ∞). The model has been proved to be able to be successfully used for determining the reliability of the abovementioned systems. The probability of faultless operation in time t was assumed the measure of system reliability. Operating situations of sea-going vessels were characterised, with special attention being paid to the fact that the loads of propulsion system components of these vessels are of random nature. These loads lead to damages which for this reason were also considered random events. It was also assumed that the damages provoke the appearance of states of inability of particular ship propulsion system components which means that these states are random events as well. The states of ability of a given ship propulsion system have been assumed to exist when all components of this system are in the state of ability. In case when at least one component is in the state of inability, the entire system is in the state of inability. Conditions were formulated for the reliability model of an arbitrary system to be able to be worked out in the form of the semi-Markov process. The need for the use of technical diagnostics in reliability examination of sea-going ship propulsion systems was indicated. In conclusions, certain qualities of the article were highlighted which are, in author’s opinion, of highest importance in reliability examination of sea-going ship propulsion systems.
Assembling of bearing sleeve on ship propulsion shaft by using EPY resin compound
This paper presents an original novel solution of the problem of assembling a large bearing sleeve (of about 1000 mm in diameter) on ship propulsion shaft by using EPY resin compound. The problem is discussed on the concrete example dealing with a ship under repair. Design project of assembling the sleeve on the shaft by using the resin compound, model research on its casting process as well as assembling technology of the sleeve on the shaft, are presented and a practical way of realization of the project in conditions of a Chinese ship repair yard, is also highlighted. During more than three-year-long operation the solution has standed the test of time without any complaint.
In the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, design has recently been developed of a small inland ship with hybrid propulsion and supply system. The ship will be propelled by a specially designed so called parallel hybrid propulsion system.
The work was aimed at carrying out the energy efficiency analysis of a hybrid propulsion system operating in the electric motor drive mode and at performing the noise pollution measurements.
The performed investigations have shown that a significant impact on the efficiency and on the acoustic emission has the type of belt transmission applied.
Mean long-term service parameters of transport ship propulsion system: Part I Screw propeller service parameters of transport ship sailing on a given shipping route
During ship sailing on a given shipping route in real weather conditions all propulsion system performance parameters of the ship change along with changes of instantaneous total resistance and speed of the ship. In this paper results of calculations are presented of distribution function and mean statistical values of screw propeller thrust, rotational speed and efficiency as well as propulsion engine power output and specific fuel oil consumption occurring on selected shipping routes. On this basis new guidelines for ship propulsion system design procedure are formulated.
REFERENCES 1. Bondarenko O., Kashiwagi M.: Dynamic behaviour of shippropulsion plant in actual seas, Journal of the JIME, Vol. 45, Special Issue, 2010. 2. Domachowski Z., Ghaemi M. H.: Marine control systems (in Polish, Okrętowe układy automatyki), Publication of Gdansk University of Technology, ISBN 9788373481770 837348177X, 2007. 3. Ghaemi M.: Changing the shippropulsion system performances induced by variation in reaction degree of turbocharger turbine, Journal of Polish CIMAC.-Vol. 6., No.1, 2011. 4. Lewandowski E.M., 2004, The Dynamics of marine craft