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1
Content available Approximate method of calculation of the wind action on a bulk carrier
100%
Żelazny K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2014
|
tom nr 38 (110)
131--135
EN
While a ship is sailing, wind is acting upon the ship hull above water. As a result, additional resistance, as well as transfer drift force and drift moment emerge. The article presents an approximate method of calculating these forces for bulk carriers, in the form useful at preliminary ship design, when only basis ship dimensions are known.
2
Content available A method of calculation of ship resistance on calm water useful at preliminary stages of ship design
100%
Żelazny K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2014
|
tom nr 38 (110)
125--130
EN
During preliminary stages of ship design, decisions on ship properties are made only with little knowledge on ship hull geometry – a ship designer has only the basis dimensions at his disposal. Therefore on these initial stages of ship design, methods of calculation of ship properties (eg. resistance) on the basis of basic design criteria are indispensable. The article presents a new method of calculation of bulk carriers resistance which proves exact even with a minimum number of geometrical parameters of a ship’s hull.
3
Content available Approximate Method of Calculating Forces on Rudder During Ship Sailing on a Shipping Route
100%
Żelazny K.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
|
2014
|
tom Vol. 8, no. 3
459--464
EN
Service speed of a ship in real weather conditions is a basic design parameter. Forecasting of this speed at preliminary design stage is made difficult by the lack of simple but at the same accurate models of forces acting upon a ship sailing on a preset shipping route. The article presents a model for calculating forces and moment on plane rudder, useful for forecasting of ship service speed at preliminary stages of ship design.
4
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
100%
Żelazny K.
Polish Maritime Research
|
2015
|
tom 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.
5
Content available A simplified method for calculating propeller thrust decrease for a ship sailing on a given shipping lane
100%
Żelazny K.
Polish Maritime Research
|
2014
|
tom nr 2
27--33
EN
During ship sailing on rough water, relative ship motions can be observed which make the propeller emerge from the water, and decrease its thrust as a consequence. The article presents a simplified method for calculating the thrust decrease and the time of propeller emergence from water for the ship on a regular an irregular wave. The method can be used for predicting the operating speed of the ship on a given shipping lane.
6
Content available The influence of ship size and propeller parameters on engine workload during ship motion on regular wave
100%
Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
tom nr 41 (113)
52--57
EN
While the ship is sailing on waves the relative motions occur which result in propeller emergence, and as a consequence – propeller thrust reduction which results in a decrease in the ship’s speed. Propeller emergence is also accompanied by the decrease in torque values, with which the propeller affects the marine engine. The article presents a simplified method for calculating the decrease in torque of the propeller during ship motion on a regular wave together with the obtained results for various ship sizes and propellers.
7
Content available Influence of the service margin of service parameters of ship propulsion system. Part 2. Screw propeller service parameters of transport ship sailing on a given shipping route
63%
Żelazny K. , Szelangiewicz T.
Journal of Polish CIMAC
|
2011
|
tom Vol. 6, no 1
201-210
EN
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 at different service margin values. On this basis new guidelines for ship propulsion system design procedure are formulated.
8
Content available Influence of the service margin of service parameters of ship propulsion system. Part 1. Propulsion engine service parameters of transport ship sailing on a given shipping route
63%
Szelangiewicz T. , Żelazny K.
Journal of Polish CIMAC
|
2011
|
tom Vol. 6, no 1
191-200
EN
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 at different SM values. On this basis new guidelines for ship propulsion system design procedure are formulated.
9
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
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
tom 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.
10
Content available Energy retrieval from sea waves
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
tom nr 41 (113)
30--34
EN
Seas and oceans occupy approx. 71% of the Earth. On their surface wave action of stronger or weaker magnitude can be observed throughout a major part of the year. Wind-generated wave action contains energy, which can be retrieved and used for electrical current production. The paper shows what energy is contained in wind-generated waves on various ocean areas, presents dynamics of water movement in a wave as well as several examples of calculation results of the velocity of water particles and hydrodynamic pressures occurring in a wave.
11
Content available Energy retrieval from sea currents and tides
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
tom nr 41 (113)
24--29
EN
Seas and oceans show variations in water levels caused by tides and continuous flow of water in the form of sea and ocean currents. Tides are most visible close to the coastline – tide parameters (water speed or change in sea level) allow construction of installations producing electric energy. Sea currents – superficial and deep are characterized by means of constant speeds and directions. Therefore energy retrieval from these elements of sea environment looks very promising. The article presents basic information on tides and currents useful for designing hydroelectric power plants. The already constructed hydroelectric power stations are also presented here together with several design solutions of future such installations.
12
Prediction of mean long-term ship service speed on ocean routes. Part I. Method of mean ship service speed prediction
63%
Szelangiewicz T. , Żelazny K.
Marine Technology Transactions. Technika Morska
|
2003
|
tom Vol. 14
271-291
EN
During the ship designing process one of the Owner's requirements is obtaining the assumed ship service speed. The ship is most often sailing on wavy water which results in occurrence of additional variable resistance due to waves and wind and in ship speed reduction (the speed reduction may result also from excessive ship motions and other dangerous phenomena caused by waves). In the article the method of mean statistical dervice speed calculation for a given ship sailing in a long period of time, along the assumed navigation line, is presented.
13
Content available Mathematical model for predicting the ship speed in the actual weather conditions on the planned ocean route
63%
Szelangiewicz T. , Żelazny K.
New Trends in Production Engineering
|
2018
|
tom Vol. 1, Iss. 1
105--112
EN
While operating the ship, one of the most important tasks is forecasting the ocean route. The vessel's speed characteristics are used to predict the route. Commonly used are very simplified algorithms for calculating those characteristics in which only a few basic ship parameters are used. The article presents a more detailed mathematical model for forecasting the speed of the ship in real weather conditions. This model requires more detailed geometric data of the ship and its propulsion (propeller and propulsion engine), but this data is available for operating ships.
14
Content available Obliczenie oporu i prędkości statku w ramach prognozy długoterminowej
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2006
|
tom nr 11 (83)
297-306
PL
Podczas projektowania statku, jednym z wymagań armatora jest osiągnięcie zakładanej prędkości. W rzeczywistych warunkach pogodowych na statek działają siły od wiatru i fali, powodując powstanie dodatkowego zmiennego oporu oraz spadek prędkości. W artykule przedstawiono metodę obliczania średniej statystycznej prędkości eksploatacyjnej dla danego statku w długim okresie podczas pływania na założonej linii żeglugowej.
EN
One of shipowner's requirements that the shipyard has to satisfy is the designed ship speed. In real weather conditions a ship is affected by forces from wind and waves resulting in additional changeable resistance and ship's speed loss. The article presents a method for calculation of the mean statistical ship speed for a given ship over a long time period during an operation on a selected ocean route.
15
Content available Dangerous phones arising from the waves during the oceanic route ship
63%
Szelangiewicz T. , Żelazny K.
New Trends in Production Engineering
|
2018
|
tom Vol. 1, Iss. 1
183--189
EN
Ocean routes are recommended for ships based on economic criteria. Under the influence of waves, during the cruise of the ship, dangerous phenomena are created, the intensity of which depends on the speed of the ship and its course in relation to the direction of the waves, the state of the sea, the size of the ship, the state of loading. Although weather services are known, waves parameters are not used to calculate the value of parameters that characterize dangerous phenomena. The article presents the most frequently analysed dangerous phenomena, how they are calculated, the criteria for their evaluation, and the results of calculations for the selected vessel.
16
Content available Wpływ linii żeglugowej i wielkości statku na średnią długoterminową prędkość
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2006
|
tom nr 11 (83)
307-317
PL
W artykule przedstawiono wyniki obliczeń, dokonanych na podstawie metody opisanej w artykule [4], w postaci histogramów słupkowych prezentujących osiągi statków (średnią długoterminową prędkość) w zależności od linii żeglugowej i jego wielkości z uwzględnieniem statystycznych warunków pogodowych występujących na danej linii.
EN
The paper presents results of calculations based on a method discussed in the paper [4]. The results are given as bar charts with performance of ships (mean statistical speed) dependent on an ocean route and the size of a ship. Statistical weather data on a particular ocean route are taken into account.
17
Content available CO2 emission level as a criterion in modern transport ship design
63%
Szelangiewicz T. , Żelazny K.
Combustion Engines
|
2014
|
tom R. 53, nr 1
59--68
EN
From 2013 onwards Energy Efficiency Design Index (EEDI) for new ships has been in force. The EEDI value for a given ship is calculated according to a standard formula and compared against a ship specific standard by means of a so called reference line which will be gradually changing (decreasing) in subse-quent years. The article presents possible ways of increasing ship propulsion efficiency in order to decrease ship propulsion power, EEDI value and CO2 levels.
PL
Od roku 2013 obowiązuje projektowy wskaźnik efektywności energetycznej (EEDI) dla nowych statków. Wartość tego wskaźnika dla określonego statku obliczana jest według ustalonego wzoru i porównywana z normą dla tego statku (tzw. linią referencyjną), która będzie zmieniana (obniżana) w następnych latach. W artykule przedstawiono możliwości zwiększenia sprawności napędowej statku, a tym samym obniżenia mocy napędu wskaźnika EEDI i emisji CO2.
18
Content available Prediction of the influence of propeller emergence on its thrust reduction during ship navigation on waves
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2010
|
tom nr 21 (93)
83-87
EN
During ship's navigation on waves some relative motions occur resulting in propeller emergence, which in consequence reduces the propeller thrust. The article presents an algorithm for calculating the propeller thrust reduction as a result of ship motions on waves. The algorithm has preset parameters: significant wave height Hs, period T1 and geographical direction.
PL
Podczas pływania statku na fali powstają m.in. ruchy względne, które powodują wynurzanie się śruby napędowej, a w konsekwencji spadek naporu. W artykule przedstawiono algorytm obliczania spadku naporu śruby w wyniku kołysań statku na fali o zadanych parametrach: wysokość znacząca Hs, okres T1 i kierunek geograficzny.
19
Content available Ship service speeds and sea margins
63%
Szelangiewicz T. , Żelazny K.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2016
|
tom nr 48 (120)
43--50
EN
When designing a transport vessel, one of the most important parameters assumed by the owner is the service speed of the ship. Service speed and motor power are calculated as an approximation of the ship’s speed in calm water (i.e., the contract speed) with the addition of the sea margin (SM). In current design practice, the addition of SM is not dependent on weather parameters occurring in liner shipping. This paper proposes a new method for establishing the value of SM depending on the type and size of the vessel and the average statistical weather parameters occurring on various shipping lines. The results presented in this paper clearly demonstrate that further research is needed to determine the precise relationship between the shipping and vessel type and the weather parameters on a shipping line.
20
Content available remote Poziom emisji CO2 jako kryterium projektowe współczesnych statków transportowych
63%
Szelangiewicz T. , Żelazny K.
Prace Naukowe Politechniki Warszawskiej. Transport
|
2013
|
tom z. 98
625--635
PL
Od 2013 roku obowiązuje projektowy wskaźnik efektywności energetycznej (EEDI) dla nowych statków. Wartość tego wskaźnika dla określonego statku obliczana jest wg ustalonego wzoru i porównywana z tzw. linią referencyjną, która będzie zmieniana (obniżana) w następnych latach. Statki spełniające normy emisji CO2 będą uzyskiwały certyfikat energetyczny dopuszczający je do eksploatacji. W artykule przedstawiono możliwości obniżenia emisji CO2, a tym samym obniżenia wartości wskaźnika EEDI. Dokładniej przedstawiono propozycję modelowania i optymalizacji kadłuba statku, śruby napędowej i steru płetwowego w celu polepszenia sprawności napędowej statku, a tym samym obniżenia mocy napędu i emisji CO2.
EN
From 2013 onwards Energy Efficiency Design Index (EEDI) for new ships has been in force. The EEDI value for a given ship is calculated according to a standard formula and compared against a so called reference line which will be gradually decreasing in subsequent years (with CO2 emission levels getting lower). Ships conforming to the CO2 emission standards will be granted a validation certificate for exploitation. The article presents possible ways of lowering CO2 levels consequently resulting in smaller EEDI values as well. A more detailed description of hull design and optimisation of a propeller and a plane rudder to increase ship propulsion efficiency is offered in order to decrease ship propulsion power and CO2 levels.
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