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1

The effect on constant hell on circulation of a vessel calculated on the basis of investigation of M/S "Ziemia Zamojska" Model

Mironiuk Waldemar, Panasiuk Arkadiusz, Szymoński Marek

Scientific Journal of Polish Naval Academy

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2020

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R. 61 nr 3 (222)

14--28

EN

The article presents modeling research on the M/S "Ziemia Zamojska" reduced model, carried out in an open fresh water area by a team of employees of the Department of Operating of Floating Vessels, Polish Naval Academy, Gdynia. The research involved circulating the model with constant angle of heel on the selected side, and the main engine set to full speed ahead. Using a real ship to carry this type of investigations is risky. It may lead to some failures like e.g. rudder failure, steering gear malfunction, overload and in some circumstances even main engine seizure. For this reason, ships are not tested with the rudder put to starboard or to port at the full speed ahead setting, even during a "Crash Stop" maneuver. However, based on the analysis of accidents at sea, and practical experience, it appears that during real operating conditions of vessels, there may occur situations when, for the sake of safety, the maneuver mentioned above must be carried out. Therefore, the authors had to conduct model tests of a floating vessel for the described case of ship operation.

PL

W artykule przedstawiono opis badań modelowych modelu redukcyjnego statku M/S „Ziemia Zamojska”, przeprowadzonych na akwenie otwartym z wodą słodką przez zespół pracowników Katedry Eksploatacji Jednostki Pływającej AMW w Gdyni. Badania te polegały na wykonaniu cyrkulacji modelu statku ze stałym kątem przechyłu na wybraną burtę, utrzymując nastawę pracy silnika głównego w pozycji cała naprzód (CN). Przeprowadzenie takich testów na rzeczywistym statku jest ryzykowne. Może to doprowadzić do awarii np. steru, maszynki sterowej, przeciążenia, a nawet w szczególnych okolicznościach zatarcia silnika głównego. Z tego powodu na statkach nie prowadzi się testów polegających na wychyleniu steru na burtę przy nastawie CN, nawet podczas manewru „Crash Stop”. Na podstawie analizy wypadków na morzu, oraz z doświadczeń praktycznych, wynika, że podczas rzeczywistej eksploatacji jednostek pływających zdarzają się sytuacje, w których w celu zachowania bezpieczeństwa należy wykonać wymieniony manewr. Wymusiło to na autorach przeprowadzenia badań modelowych jednostki pływającej w opisanym przypadku eksploatacyjnym.

2

Ship maneuvering prediction using grey box framework via adaptive RM-SVM with minor rudder

Me Bin, Sun Licheng, Shi Guoyou, Liu Xiaodong

Polish Maritime Research

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2019

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nr 3

115--127

EN

A grey box framework is applied to model ship maneuvering by using a reference model (RM) and a support vector machine (SVM) (RM-SVM). First, the nonlinear characteristics of the target ship are determined using the RM and the similarity rule. Then, the linear SVM adaptively fits the errors between acceleration variables of RM and target ship. Finally, the accelerations of the target ship are predicted using RM and linear SVM. The parameters of the RM are known and conveniently acquired, thus avoiding the modeling process. The SVM has the advantages of fast training, quick simulation, and no overfitting. Testing and validation are conducted using the ship model test data. The test case reveals the practicability of the RF-SVM based modeling method, while the validation cases confirm the generalization ability of the grey box framework.

3

Ship course-keeping with neuroevolutionary algorithms

Łącki M.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2018

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nr 54 (126)

70--74

EN

The goal of research presented in this article is to check if a neuroevolutionary method with direct encoding is able to be a part of autopilot of the vessel. One of the important tasks of vessel autopilots is to keep a course as straight as possible or to bring the ship back on the route as efficiently as possible. In this paper, the adaptive neuroevolutionary autopilot is described and tested on a simulation model of a ferry. Neuroevolution is a combination of two different but related fields of artificial machine learning: evolution and neural networks. The combined method is very flexible and can be applied to other ship control tasks. The results of computer simulation of the neuroevolutionary course-keeping system have been included.

4

Simulation for Service Quality and Berths Occupancy Assessment

Kuznetsov A.L., Kirichenko A.V.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2016

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Vol. 10, no. 3

489--492

EN

Current development of the maritime transportation system, namely fleet and ports specialization, growth of vessel sizes, rationalization of routs, trade regionalization etc., has made many traditional approaches and calculation techniques practiced for many long years in port design procedures to be inadequate and insufficient. A generally acknowledged tool for this task today is the simulation technique. In the same time, modern object oriented simulation approach provides usually only ad hoc solution for a project. It lacks the generality that was the main and natural feature of its traditional analytical predecessors. Very high time and labor consumption of simulation comes to a conflict with a very narrow scope of the resulting model’s application domain. This paper describes a new approach used to create a simulation tool for the port designers and planners combining the universality and generality of the analytical (so called “static”) methods with the efficiency and accuracy of the object-oriented simulation. The concept represented in the paper was implemented in the software product, which enabled to conduct experiments that proved the validity and adequacy of the model. The simulation tool was used in several sea port design project and now is a common instrument of several leading port design and consulting company in Russian Federation.

5

Intelligent Prediction of Ship Maneuvering

Łącki M.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2016

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Vol. 10, no. 3

511--516

EN

In this paper the author presents an idea of the intelligent ship maneuvering prediction system with the usage of neuroevolution. This may be also be seen as the ship handling system that simulates a learning process of an autonomous control unit, created with artificial neural network. The control unit observes input signals and calculates the values of required parameters of the vessel maneuvering in confined waters. In neuroevolution such units are treated as individuals in population of artificial neural networks, which through environmental sensing and evolutionary algorithms learn to perform given task efficiently. The main task of the system is to learn continuously and predict the values of a navigational parameters of the vessel after certain amount of time, regarding an influence of its environment. The result of a prediction may occur as a warning to navigator to aware him about incoming threat.

6

Determining Ship’s Safe Speed and Best Possible Speed for Sea Voyage Legs

Rutkowski G.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2016

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Vol. 10, no. 3

425--430

EN

The purpose and scope of this paper is to describe factors to consider when determining the ship’s safe speed as well as the best speed for the sea voyage legs including directions related to vessel speed that are given in ColRegs, voyage orders and charter parties. Author also tried to describe the definition for the following notions: ship maneuvering, ship handling, safe speed, best possible speed for sea voyage legs.

7

Modelowanie ruchu statku podczas wchodzenia w główki falochronu portowego przy występowaniu silnego prądu poprzecznego

Pastusiak T.

Logistyka

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2009

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nr 6

CD-CD

PL

Przeanalizowano różne kryteria oceny bezpieczeństwa statku na torze wodnym przy oddziaływaniu silnego prądu poprzecznego. Zjawisko okazało się złożone ale możliwe do ujęcia matematycznego. Modelowanie zjawiska i symulacja zachowania się statku w różnych warunkach otoczenia powinno dać wskazania dla projektowania nowych bezpiecznych parametrów torów wodnych i konstrukcji hydrotechnicznych oraz zweryfikowania przepisów lokalnych dotyczących już istniejących torów. Zjawisko będzie najwierniej odzwierciedlone przy zastosowaniu trójwymiarowej domeny statku i trójwymiarowych map elektronicznych. Powyższe badania można rozszerzyć o wpływ większej liczby zakłóceń zewnętrznych oraz opracowanie szczegółowego modelu zachowania się statku. Praca ta będzie przedmiotem dalszych badań autora.

EN

One analyzed different evaluation criteria of the safety of the ship on the fairway at the influence of the transversal strong current. The occurrence proved composite but possible to the mathematical seizure. The modeling of the occurrence and the simulation of the comportment of the ship in different ambient conditions should give indications for the designing of new safe parameters of fairways and engineering constructions and verifying of local regulations concerning already existing tracks. The occurrence will be most retentively reflected at the use of the three-dimensional domain of the ship and three-dimensional electronic charts. Above research can be extended for the influence of the greater number of external disturbances and the elaboration of the detailed model of the behavior of the ship. This work will be a subject of further research of the author.