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1
Content available The Analysis of Motion Dynamics and Resistance of the Multipurpose Boat Operating in Shallow Water
Kulczyk T., Górnicz T.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2014
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Vol. 8, no. 3
359--363
EN
Polish market of small boats has been developed very dynamically in recent years. Market competition forces the shipyards to build new more efficient hull forms and to cut the cost of production as well. This is why modern computer simulation programs are used more often by naval architects. Another trend is to design more universal ships that may be used by larger number of diversified customers. This paper presents project proposal of multipurpose boat hull form. The boat was design to fulfil the requirements imposed by public services like water police, fire brigades, and border guards. It is supposed to be operated on unexplored floodplains and other type shallow waters. The analysis of boat’s motion was based on computer simulations. The resistance curve was evaluated with two methods: comparison study of model test results of similar ships and CFD methods. The results obtained from Ansys Fluent and FINE/Marine systems were compared in this paper. It was shown that taking into consideration dynamic trim and sinkage has a significant impact on free surface capture and resistance values.
2
Content available Komputerowa symulacja procesów zachodzących w komorze koksowniczej
Słupik Ł., Fic A., Nowicki G.
Piece Przemysłowe & Kotły
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2014
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1-2
15--20
PL
W artykule przedstawiono model matematyczny procesów cieplnych oraz przepływowych zachodzących podczas koksowania wsadu węglowego w komorze koksowniczej. Model uwzględnia przepływ ciepła na drodze dyfuzji, konwekcji oraz promieniowania. Jednocześnie zamodelowano lokalne procesy odparowania oraz skraplania wilgoci, kinetykę uwalniania części lotnych wraz z towarzyszącymi im efektami energetycznymi. Uzyskane wyniki modelowania pokrywają się z pomiarami eksperymentalnymi wykonanymi na doświadczalnej instalacji pieca z ruchomą ścianą. Model matematyczny opracowano w Instytucie Chemicznej Przeróbki Węgla w Zabrzu w ramach projektu Inteligentna Koksownia.
EN
Within article a mathematical model of thermal and flow process occurring within coking chamber is presented. The model encompasses coupled diffusive, convective and radiative heat transfer. At the same time range of aspects associated with carbonization process such as: water evaporation and condensation, kinetics describing release of volatiles accompanied with energy effect are considered. Obtained results coincident well with measurement conducted on the experimental coking chamber. The mathematical model was developed at Institute for Chemical Processing of Coal as a part of the project entitled "Smart Coke Plant Meeting the Requirements of Best Available Techniques".
3
Ocena efektywności modelu w procesie symulacji komputerowej
Trębicka A.
Logistyka
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2012
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nr 3
PL
W pracy podjęto próbę zastosowania komputerowego modelowania do poprawy przepływów wody i regulacji ciśnień w wodociągu w miejscowości Rutka. Dynamiczny model sieci wodociągowej jest więc wysoce wydajnym narzędziem wspomagającym obserwację i regulowanie ciśnień i przepływów wody, pozwalającym na podejmowanie uzasadnionych decyzji odnośnie eksploatacji, modernizacji i rozbudowy całego systemu wodociągowego miasta lub gminy.
EN
It the paper used of computer modelling to improvement of waters flows and the control of pressures in water-pipe the populaces Rutka. The dynamic model of water-supply net is so the extremely effective helping the tool observation and regulation the pressures and the flows of water, permitting on undertaking of well-founded decisions regarding the exploitation, modernization and extension of whole system of water-supply city or the populaces.
4
Content available Marine Navigation Using Expert System
Nikitakos N., Fikaris G.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2009
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Vol. 3, no. 3
251--259
EN
A ship’s autopilot adjustment is a matter of utmost importance since it affects its safety, command as well as fuel and time efficiency. A number of methods have been developed in order to cope with this issue usually based on models that simulate the weather conditions and adjust the device accordingly. Some of them have a considerable degree of success but none dealt with the problem completely. The main obstacles are the difficulty of simulating the infinite weather and loading conditions and to properly represent them with mathematical equations or rules. This paper describes a method of selecting the best out of a pre-existing set of configurations, taking into account any weather situation, loading condition and type of ship. Moreover, the selected configuration can improve itself during the entire life cycle of the vessel, since it fine tunes its properties for better results. This approach uses Case Based Reasoning as its core technology and is a part of a hybrid system that analyses and solves prefixed problems of maritime interest.
5
Content available The Analysis of Possibilities How the Collision Between m/v 'Gdynia' and m/v 'Fu Shan Hai' Could Have Been Avoided
Banachowicz A., Wolejsza P.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2008
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Vol. 2, no. 4
377--381
EN
The report presents the simulation results of collision between m/v “Gdynia” and m/v “Fu Shan Hai”. The analysis was performed by means of decision support in collision situations. This system is based on a structure of programme multiagents using AIS data (Automatic Identification System) with the possibility of cooperation between agents or vessels. The multiagent system of supporting anticollision decisions increases the reliability of navigational information and permits making right decisions, thereby increasing safety at sea.
6
Content available Planned Route Based Negotiation for Collision Avoidance Between Vessels
Hu Q., Yang C., Cheng H., Xiao B.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2008
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Vol. 2, no. 4
363--368
EN
Automatic vessel collision-avoidance systems have been studied in the fields of artificial intelligence and navigation for decades. And to facilitate automatic collision-avoidance decision-making in two-vessel-encounter situation, several expert and fuzzy expert systems have been developed. However, none of them can negotiate with each other as seafarers usually do when they intend to make a harmonious and more economic overall plan of collision avoidance in the COLREGS-COST-HIGH situations where collision avoidance following the International Regulations for Preventing Collisions at Sea(COLREGS) costs too much. A negotiation framework was put forward in our previous research to enable vessels to negotiate for optimizing collision avoidance in the COLREGS-COST-HIGH situations at open sea. In this paper, the negotiation framework is improved by considering the planned route of both vessels. The simulation results show that more economic overall plan of collision avoidance may be achieved by the improved framework when one or both parties deviate from their planed route or are approaching their next way points.
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