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1
Content available Accuracy evaluation of Ro-Ro and Ro-Pax ships arrival to the ports
Paulauskas V., Paulauskas D.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2020
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Vol. 14, no. 2
397--399
EN
Ro-Ro and Ro-Pax ships works on basis of regular schedule and try keep this schedule as accurate as possible. In same time difficulties during Ro-Ro and Ro-Pax ships voyages like bad weather conditions, waiting time to entry in to port, ship's failures and others, sometime request more time as it was planned initially. Ro-Ro and Ro-Pax ships arrivals in to port evaluation is important not only just for the Ro-Ro and Ro-Pax shipping lines planning but as well it is very important for passengers, transport units (trucks) and port terminals. In this Article are analyzed delay times of Ro-Ro and Ro-Pax ships arrival to port on basis of statistical data and used mathematical models for calculation of the arrival time pass.
2
Content available Optimization of ship’s crew change schedule
Bošnjak Rino, Bukljaš Mihaela, Medić Dario, Vukša Srđan
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2019
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nr 59 (131)
29--33
EN
Seaborne shipping must often cope with issues related to planning, ship scheduling, and arranging crews and optimal shipping routes between ports. Human resources departments typically plan ship crew shifts with regards to the seafarers’ right to vacation days. It is difficult to harmonize all the requirements and to satisfy both the seafarers and the company. Ideally, arrangements are made for the crewmember to sign off upon completion of a contract, with the vessel being at a port convenient to change the crew at a minimum cost. The latter may vary greatly, depending on the size of the crew to be replaced, the distance of the port from the crew destination, and the available taking-over crew at a specific place and time, etc. In these situations, linear programming (LP) is frequently used as a mathematical method to determine the optimal results. This study suggests the use of a linear-binary programming model in LINGO software to arrange the ship’s crew change schedule.
3
Content available Average fuel consumption by a ship on a sales line in statistical weather conditions
Szelangiewicz T., Żelazny K.
New Trends in Production Engineering
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2018
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Vol. 1, Iss. 1
573--579
EN
During operation of the ship, fuel consumption and associated emissions are very important for economic and ecological reasons. The fuel consumption is greatly influenced by the choice of shipping route, weather conditions on these routes and engine control criteria. The article presents its own algorithm for forecasting ship operation parameters, including fuel consumption on selected shipping routes for average, statistical (seasonal) weather parameters occurring on these routes. It shows what factors have the main impact on fuel consumption and how you can affect fuel consumption during the cruise in changing weather conditions.
4
Content available An approximate method for calculating the mean statistical service speed of container ships on a given shipping line and its application in preliminary design
Szelangiewicz T., Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2015
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nr 44 (116)
34--42
EN
During ship design, service speed is one of the crucial parameters in determining the operational economy of the vessel. As sufficiently exact calculation methods applicable to preliminary design stage are lacking, the so-called contract speed, the speed which a ship reaches in calm water, is usually cited. Żelazny (2015) developed a parametric method for calculating total ship resistance under actual weather conditions (wind, waves, sea current). This paper presents a parametric model of a ship’s propulsion system (screw propeller – propulsion engine) as well as a method, based on both the resistance and propulsion system models, of calculating the mean statistical value of a ship’s service speed under the seasonal weather conditions occurring on shipping lines. The method makes use only of basic design parameters, and may be applied in preliminary design phase of container ships.
5
Content available Application isssues of the semi-markov reliability model
Rudnicki J.
Polish Maritime Research
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2015
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nr 1
55--64
EN
Predicting the reliability of marine internal combustion engines, for instance, is of particular importance, as it makes it possible to predict their future reliability states based on the information on the past states. Correct reliability prediction is a complex process which consists in processing empirical results obtained from operating practice, complemented by analytical considerations. The process of technical state changes of each mechanical device is stochastic and continuous in states and time, hence the need to divide this infinite set of engine states into a finite number of subsets (classes), which can be clearly and permanently identified using the existing diagnosing system. Using the engine piston-crankshaft system as an example, the article presents a proposal for a mathematical model of reliability which, on the one hand, takes into account random nature of phenomena leading to the damage, and at the same time reveals certain application flexibility and the resultant practical usability.
6
Content available An approximate method for calculation of mean statistical value of ship service speed on a given shipping line, useful in preliminary design stage
Żelazny K.
Polish Maritime Research
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2015
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nr 1
28—35
EN
During ship design, its service speed is one of the crucial parameters which decide on future economic effects. As sufficiently exact calculation methods applicable to preliminary design stage are lacking the so called contract speed which a ship reaches in calm water is usually applied. In the paper [11] a parametric method for calculation of total ship resistance in actual weather conditions (wind, waves, sea current), was presented. This paper presents a parametric model of ship propulsion system (screw propeller - propulsion engine) as well as a calculation method, based on both models, of mean statistical value of ship service speed in seasonal weather conditions occurring on shipping lines. The method makes use of only basic design parameters and may be applied in preliminary design stage.
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