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1
Content available Prediction control systems in marine applications
Gierusz W., Miller A.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2020
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Vol. 14, no. 2
361--366
EN
The paper presents one of the modern control methods used for steering of the ship motion. The different automatic systems used to navigate the vessels are described at the beginning. Next, prediction control methodology is presented and multidimensional MPC regulator applied to steering of the training ship is shown as a technical product. Tests results from the real-time experiments with the mentioned controller are presented at the end of the article.
2
Content available Determination of seakeeping performance for a case study vessel by the strip theory method
Niklas Karol, Karczewski Artur
Polish Maritime Research
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2020
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nr 4
4--16
EN
The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the operational capacity and propulsion efficiency of the ship, as well as on comfort and safety of navigation. The article analyses selected aspects of seakeeping for four variants of a selected case study vessel, indicating practical limitations of the strip method. The analysed aspects included hull heaving and pitching, added resistance, Motion Thickness Indicator (MSI), and Subjective Magnitude (SM). Experimental tests were also performed in the towing tank. Their comparison with the numerical results has indicated high inaccuracy of the strip method. What is more, the simplified representation of hull shape used in the strip method makes it impossible to analyse the effect of hull shape changes on the predicted seakeeping characteristics. Especially for the case of head wave, neglecting highly non-linear phenomena, such as slamming or head wave breaking, in strip method-based computer simulations will significantly decrease the reliability of the obtained results. When using the strip method, the seakeeping analysis should be complemented with model tests in a towing tank, or by another more complex numerical analysis, such as CFD for instance.
3
Content available remote On scaling of ship seakeeping
Artyszuk J.
Prace Naukowe Politechniki Warszawskiej. Transport
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2016
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z. 112
9--24
EN
The widely accepted linear model of ship motions in waves is considered in frequencydomain, where the steady-state harmonic motions as response to harmonic waves are of interest. The solution of motion transfer functions is presented in dimensionless form with special concern about the dimensionless wave frequency as independent variable. Though some facts are known within ship model testing methodology, this detailed and careful derivation is aimed to enhance in-depth understanding of the seakeeping characteristics of a ship. It is also expected that a transfer functions data exchange between one full-scale ship and another of close geometry yet of different size will be more encouraged.
PL
Na bazie liniowego modelu dynamiki wyprowadzono funkcje przenoszenia sprzężonych kołysań statku na fali harmonicznej. Szczególny nacisk położono na pełne ujęcie bezwymiarowe, z istotną rolą bezwymiarowej częstości fali. Mimo że ta ostatnia jest szeroko stosowana w okrętowych badaniach modelowych, to jest stosunkowo rzadko wykorzystywana w przeliczaniu funkcji przenoszenia między statkami rzeczywistymi o różnych wielkościach, gdy takie charakterystyki są znane. Ma to znaczenie np. w szybkim modelowaniu większej klasy statków i oceny ryzyka eksploatacji, m.in. w systemach nadzoru ruchu. Zarówno sam sposób niniejszego wywodu, jak i dyskusja poszczególnych założeń i kroków ma stanowić przyczynek do lepszego rozumienia analizy bezwymiarowej ('bezwymiarowania') w odniesieniu do kołysań statku, i tym samym służyć zwiększeniu świadomości użytkowników narzędzi analitycznych i decydentów.
4
Content available Modelowanie CFD osiadania statków kontenerowych podczas manewru wymijania na torze wodnym
Jachowski J., Krata P.
Autobusy : technika, eksploatacja, systemy transportowe
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2016
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R. 17, nr 4
64--71
PL
W artykule omówiono badania nad zastosowaniem zaawansowanych obliczeń numerycznej mechaniki płynów do wyznaczania trajektorii ruchu (w sześciu stopniach swobody) statku morskiego żeglującego na akwenie ograniczonym podczas manewru wymijania z innym statkiem. Uwzględniono jednocześnie zarówno oddziaływanie dna i brzegów kanału o zadanej geometrii jak również oddziaływanie wymijanego statku, co jest podejściem nowatorskim na skalę światową. Wyniki symulacji przeanalizowano pod wzglądem hydrodynamicznego zjawiska osiadania, powstającego podczas przejścia statku przez akwen ograniczony głębokością i brzegami kanału przy jednoczesnej interakcji z wymijanym statkiem. W obliczeniach wykorzystano geometrię typowego statku kontenerowego.
EN
Paper describes a research into ship’s squat phenomenon which is related to the safe entering of large ships into contemporary existing sea harbors. As the significant research effort in ship hydromechanics is devoted in recent years to the practical navigation problems, the Authors follow this trend and addressed the squat by means of CFD numerical simulations. The analysis of 6 DOF ship motion was performed, including the effects of shallow water, horizontal restrictions, extend of a channel and especially ship squat during passing by maneuver at a waterway. An exemplary case-study is carried out for a large container vessel. The obtained results were experimentally verified by comparison to one German experiment and own models tests. Such complex approach is a novelty worldwide.
5
Content available Concept of FTS model of ship motion based on expert shiphandling knowledge
Zalewski P.
Annual of Navigation
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2009
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No. 15
117-124
EN
The paper presents a concept of FTS model of ship motion reflecting navigator's decision process while entering a Świnoujscie harbour on specific ship type at given hydrometeorological conditions. The conceptual model has been based on the fuzzy logic controller with expert database formed by manoeuvres obtained from the real-time non-autonomous trials classified in relation to expert manoeuvre impact on ship's advance, lateral and rotation speed and her position in reference to the present ship status.
6
Content available Analysis of the wind influence on the ship turning manoeuvers on port turning basins
Kornacki J.
Zeszyty Naukowe / Akademia Morska w Szczecinie
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2008
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nr 13 (85)
40-44
EN
The paper presents the problem of the wind influence on a ship during the turning manoeuvre and the influence on this manoeuvre. Attention has been paid to the necessity of attaching larger attention to the influence of the wind during the turning manoeuvre. The analysis of the wind influence on this manoeuvre has been conducted.
PL
W artykule został podjęty problem oddziaływania wiatru na statek podczas manewru obracania i wpływ na ten manewr. Zwrócono uwagę na konieczność przywiązywania większegoznaczenia na oddziaływanie wiatru podczas manewru obracania. Przeprowadzono analizę wpływu wiatru na ten manewr.
7
Ship motion affected by moving liquid cargo in holds
Warmowska M., Jankowski J.
Systems : journal of transdisciplinary systems science
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2006
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Vol. 11, nr 1
117-124
EN
Liquid cargo moving in holds (sloshing) of a ship sailing in waves affects ship motion. Sloshing forces are taken into account in the equations of ship motion. The motion of liquid cargo in ship holds is described by boundary value problems in which the essential element is the moving free surface of the liquid. This problem is solved by Boundary Element Method. This paper presents the analysis of ship motion effected by moving molten sulphur in partly filled holds. The analysis has been carried out for different regular and irregular waves inducing ship motion coupled with sloshing. A numerical solution of the sloshing boundary-value problem and the equations of ship motion make it possible to develop a visualization of the ship motion in waves.
8
Content available Effects of ship motion on acoustic remote sensing
Tegowski J., Zielinski A.
Hydroacoustics
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2003
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Vol. 6
205--214
EN
Ship motion affects quality of acoustic data collected by various acoustic remote sensing systems used for bottom and fisheries surveying. The angular position of an acoustic beam changes in time from its nominal position vertical to sea surface. This motion affects the acoustic returns from the bottom and other targets by changing their intensity and arrival times. In this paper we illustrate these effects on bottom returns obtained using single beam sonar.
9
Content available remote Wiatr w matematycznym modelu manewrowania statkiem - problematyka badawcza
Artyszuk J.
Zeszyty Naukowe / Wyższa Szkoła Morska w Szczecinie
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2002
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nr 65
21-32
PL
W artykule nakreślono stan badań w zakresie oddziaływania wiatru w modelach matematycznych manewrowania statkiem. Konieczne jest zwrócenie większej uwagi na oddziaływanie fal, zwykle silniejsze i towarzyszące wiatrowi. Podniesiono problem korekcji morskich prób manewrowych do warunków zerowych wiatru, co jest istotne przy akwizycji danych do identyfikacji modeli matematycznych ruchu. Przeanalizowano dokładności określenia oddziaływań wiatru.
EN
The state of the art in wind effect investigations during ship manoeuvring is outlined. Besides, issues for future research are raised, especially as regards the accompanying wave forces. The problems of full-scale trials correction to calm weather conditions are considered, an important point in a proper identification of hull-propeller-rudder complex based on such data. A sensitivity analysis of wind effect estimation is performed.
10
Content available Fuzzy control for ship motion
Broel-Plater B.
Annual of Navigation
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2001
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No. 3
31-40
EN
In the article a fuzzy-logic based algorithm for ship motion control is presented. The system operates in an open-closed loop control system with set-point changes and wind action being compensated. a detailed description of the feedback loop controller is given. The controller has a hierarchical structure, in which independent coordinated fuzzy-logic controllers for vessel motion components are situated. The controllers perform in two modes: as velocity controllers and position controllers. The paper is completed with computer simulations.
11
Content available A formal description of navigational process
Jackowski K.
Annual of Navigation
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2001
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No. 3
41-74
EN
In this paper there is undertaken an attempt to present the formal description of the ship’s navigation process. This formal description takes into account not only all the most important ship’s characteristics that influence the ship’s motion but also all the most important environmental characteristics influencing the ship’s behaviour at sea. The formal description comprises the following issues: ship’s navigation process, navigational information, dynamic of the ship’s motion, equations describing the ship’s navigation process, and mathematical models of ship’s navigation process.
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