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Wyświetlanie 1-10 z 10
Tytuł:
A perfect warning to avoid collisions at sea?
Autorzy:
Baldauf, M.
Mehdi, R.
Fischer, S.
Gluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/135016.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
collision avoidance
collision warning
manoeuvring decision support
dynamic prediction methods
Fast-Time-Simulation
Opis:
Avoidance of collisions is one of the most important tasks for the officer of the watch on a ship’s bridge. Measures and actions required to avoid such accidents are described in the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs) adopted by the International Maritime Organization (IMO) in 1972 and still valid, with several minor amendments, since then. On the basis of a proper look-out at all times, by sight and hearing, and the use of all available means, also including technical equipment installed on-board as well as information provided by a Vessel Traffic Service (VTS), the navigating officer collects traffic and environmental data and combines them with their own ship data to construct a mental traffic image for the assessment of risk of collision with other objects in the vicinity. In the case wherre there is an unacceptable risk she or he has to decide on taking action. In most of the cases decision making is appropriate to the prevailing circumstances and ships maneuver and pass at a safe distance. Only in very rare cases, due to whatever reasons, watch officers fail in taking appropriate actions in good time. It is assumed that, if effective alerting algorithms would be available, a substantial number of collisions at sea, and especially in coastal waters, can be avoided by making the watch officer aware that the ‘last line of defence’ for taking action is close to come. It is assumed that there is potential in applying the principle of the resolution advisory alert of an ACAS (Airborne Collision Avoidance System)/TCAS (Traffic Alert and Collision Avoidance System) in aviation and adapt it to the needs of maritime traffic. In this paper, the authors introduce a method for triggering collision warnings by focusing specifically on the critical last phase of an encounter and taking into account the maneuvering characteristics of the navigating ship. They comprehensively explore the application using scenario studies discussing the operational aspects of varying implementation states (one ship only, SOLAS ships only).
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 52 (124); 53-64
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manoeuvring Simulation on the Bridge for Predicting Motion of Real Ships and as Training Tool in Ship Handling Simulators
Autorzy:
Benedict, K.
Kirchhoff, M.
Gluch, M.
Fischer, S.
Baldauf, M.
Powiązania:
https://bibliotekanauki.pl/articles/116460.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Manoeuvring
Manoeuvring Simulator
Predicting Motion
Real Ships
Training Tool
ship handling simulator
Navigational Bridge
Full Mission Bridge Simulator (FMBS)
Opis:
International sea transport has growing rapidly during the period of the last decade. Ships became larger and wider and its container capacity is still increasing to 12.000 TEU and even more. To navigate such vessels safely from port to port and specifically within the ports more and more enhanced computer-based systems are installed on the ships navigational bridges. Prediction tools are very helpful and already in use on ships for a long time. However, the simplification of existing predictions allows restricted use only and do not include the immediate response on changes of rudder and engine. Within this paper investigations into the feasibility and user acceptance of newly developed layout of navigation display will be introduced and selected results of simulation studies testing the influence on manoeuvre performance dependent on different kind of prediction functions will be discussed. Examples will be given for results from test trials in the full mission ship handling simulator of the Maritime Simulation Centre Warnemunde and a concept for the application of the developed .tools for purposes of collision avoidance is described.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 1; 25-30
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Augmented Manoeuvring Design and Monitoring – a New Method for Advanced Ship Handling
Autorzy:
Benedict, K.
Kirchhoff, M.
Gluch, M.
Fischer, S.
Schaub, M.
Powiązania:
https://bibliotekanauki.pl/articles/117040.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Handling
Simulation, Simulation Augmented Manoeuvring Design and Monitoring (SAMMON)
Maritime Simulation Centre Warnemuende
Manoeuvring
Ship Handling Operation
ship handling simulator
Advanced Ship Handling
Opis:
A fast time simulation tool box is under development to simulate the ships motion with complex dynamic models and to display the ships track immediately for the intended or actual rudder or engine manoeuvre. Based on this approach the innovative “Simulation Augmented Manoeuvring Design and Monitoring” - SAMMON tool box will allow for (a) a new type of design of a manoeuvring plan as enhancement exceeding the common pure way point planning (b) an unmatched monitoring of ship handling processes to follow the underlying manoeuvring plan. During the manoeuvring process the planned manoeuvres can be constantly displayed together with the actual ship motion and the predicted future track which is based on actual input data from the ship’s sensors and manoeuvring handle positions. This SAMMON tool box is intended be used on board of real ships but it is in parallel an effective tool for training in ship handling simulators: (a) in the briefing for preparing a manoeuvring plan for the whole exercise in some minutes, (b) during the exercise run to see the consequences of the use of manoeuvring equipment even before the ship has changed her motion and (c) in debriefing sessions to discuss potential alternatives of the students decisions by simulating fast variations of their choices during the exercises. Examples will be given for results from test trials on board and in the full mission ship handling simulator of the Maritime Simulation Centre Warnemuende.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 131-141
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation-Augmented Methods for Safe and Efficient Manoeuvres in Harbour Areas
Autorzy:
Benedict, K.
Kirchhoff, M.
Gluch, M.
Fischer, S.
Schaub, M.
Baldauf, M.
Powiązania:
https://bibliotekanauki.pl/articles/116369.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
manoeuvres in harbour areas
harbour areas
Simulation-Augmented Manoeuvring Design and Monitoring (SAMMON)
Fast-Time Manoeuvring Simulation Technology (FTS)
Co-operative Ship Operation in Integrated Maritime Traffic Systems (COSINUS)
Maritime Unmanned Navigation through Intelligence in Networks (MUNIN)
Innovative Ship Simulation and Maritime Systems (ISSIMS) Navigational Methods Development
Opis:
Safety of navigation is especially challenging and critical when a ship approaches and manoeuvres in harbour areas. Improving the safety especially in the first and last phase of a voyage is crucial and requires measures addressing both the human and technical-technological elements including support systems that shall provide human operators with information relevant for decision making. The present situation is characterized by the introduction of numerous sophisticated technical and support systems often integrated with several components becoming increasingly complex. On the users end, changes are not that obvious and not that rapid as for technology. However, new approaches are under development or already in use. They are characterized by applying and adapting solutions from other transport modes. In this way, tasks and procedures on ships, that are highly safety-relevant and containing high portions of manoeuvring activities have been changed to high back-up procedures as in air planes. For port manoeuvres e.g. the system of pilot/co-pilot was introduced on ferries in a sense that one officer is operating and the other is monitoring and checking the safe performance. In cruise shipping, new structures replacing the traditional rank-based with a flexible system based on job functions. This system creates a kind of a safety net around the person conning the vessel. Each operation is cross checked before execution by one or two other persons. The first obvious consequence is higher costs due to doubling personnel. On the other hand there is also a need for a technology appropriately supporting the checking officer by enabling her or him to monitor what the conning officer is doing. “Fast-Time Manoeuvring Simulation Technology” (FTS) developed at the Institute for Innovative Ship Simulation and Maritime Systems (ISSIMS) has huge potential to fulfil this task. FTS calculates within one second of computing time up to 1000 seconds of real manoeuvring time by a very complex ship-dynamic simulation model for rudder, engine and thruster manoeuvres. It enables prompt prediction of all manoeuvres carried out by the conning officer for the observing officer, too. Predictions of path and motion status allow all officers to see whether the manoeuvring actions have at least the correct tendency or indicating the need for corrections. This new type of support is called Simulation-Augmented Manoeuvring Design and Monitoring (SAMMON) – it allows not only overlooking the next manoeuvring segment ahead but also for the following or even for series of manoeuvring segments. This technology has been used within two research projects: COSINUS (Co-operative Ship Operation in Integrated Maritime Traffic Systems) set out for implementing FTS into integrated ship bridges and to also communicate the manoeuvre plans and display it to VTS centres. Within the European project MUNIN (Maritime Unmanned Navigation through Intelligence in Networks) this technology has been used to investigate if it is possible to steer autonomous ships, in case it would be necessary.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 193-201
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manoeuvring areas to adapt ACAS for the maritime domain
Autorzy:
Baldauf, M.
Mehdi, R.
Deeb, H.
Schröder-Hinrichs, J. U.
Benedict, K.
Krüger, C.
Fischer, S.
Gluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/135052.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
situation-dependent analysis
risk assessment
risk of collision
collision probability
prediction of manoeuvring areas
potential areas of water
fast time simulation
Opis:
Rapidly increasing numbers of ships and ship sizes pose an ever-growing challenge to the maritime industry. Although statistics indicate improved levels of safety in the industry which carries 90% of the world’s trade, the risk of navigational accidents, among other issues, remains a prime concern and priority (EMSA, 2010; 2014). In order to address these concerns, the authors turned to another high-risk industry for inspiration. Specifically, they turned to the aviation industry, which has often been used as a source of comparisons and ideas by researchers in the maritime domain. Keeping up with the trend, the authors of this paper turn to a tried-and-tested system used widely in modern aviation: the Airborne Collision Avoidance System (ACAS). The prime idea behind ACAS is to construct two virtual 3D zones around an aircraft. These zones are dynamic, and depend on the manoeuvring characteristics of a given aircraft. If the system detects an “intruder” (another aircraft) in either of the two well-defined virtual zones, it provides warnings and/or instructions to pilots of both aircraft to take certain precautionary or emergency measures. In the current paper, the authors explore whether or not such a system is feasible for use in the maritime domain and, if so, how. The paper provides a detailed analysis of the potential benefits and drawbacks of using an ACAS-like system onboard vessels. It also discusses possible means of implementation and integration with current equipment, and explores how the introduction of e-navigation may impact the proposed solution.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 39-47
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected design and construction aspects of supercritical steam generators for high temperature reactors
Wybrane zagadnienia konstrukcji i projektowania wytwornic pary o parametrach nadkrytycznych współpracujących z reaktorami wysokotemperaturowymi
Autorzy:
Przybylski, M.
Głuch, J.
Powiązania:
https://bibliotekanauki.pl/articles/173105.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wytwornica pary
obieg Rankine'a
parametry nadkrytyczne
wymiennik ciepła
steam generator
Rankine cycle
supercritical parameters
heat exchanger
Opis:
Article presents design and construction considerations on supercritical (once-through) steam generator using high and very high temperature reactor cores as heat source. Helical-coil steam generators are preferred over other types of design thanks to their increased heat transfer rate and compactness. Applicable modernised Rankine cycle and changes in thermophysical parameters of water in the neighbourhood of critical and pseudocritical points are examined. Correlations determining heat transfer coefficient are analysed in order to select the most applicable among them. Critical design aspects of such a supercritical nuclear steam supply system are discussed.
Omówiono wybrane zagadnienia konstrukcji i projektowania przepływowych wytwornic pary współpracujących z rektorami wysoko i bardzo wysoko temperaturowymi. Wytwornice pary o powierzchni wymiany ciepła w formie koncentrycznych spiral wielozwojowych są preferowanym typem dzięki intensyfikacji wymiany ciepła, której towarzyszy redukcja wymiarów zewnętrznych. Przedstawiony został stosowny obieg Rankine’a oraz przeanalizowane zmiany parametrów termofizycznych wody w otoczeniu punktu krytycznego i pseudokrytycznych. Artykuł zawiera analizę i uzasadnienie doboru korelacji określających intensywność procesu przejmowania ciepła przez wodę w stanie nadkrytycznym oraz stosowne poprawki umożliwiające stosowanie jej w przypadku omawianego typu konstrukcyjnego wytwornicy pary.
Źródło:
Archiwum Energetyki; 2012, 42, 2; 113-120
0066-684X
Pojawia się w:
Archiwum Energetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of application of feed-water injector heaters to steam power plants
Autorzy:
Trela, M.
Kwidziński, R.
Głuch, J.
Butrymowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/259351.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
power plants
feedwater heaters
supercritical steam-water injector
injector model based on balances of mass
Opis:
Steam-water injectors are devices in which exchange of mass, momentum and energy between two fluids being in direct contact, occurs. They can operate as pumps, mixers or direct contact heat exchangers. In the last aspect their use as feed-water heaters in Rankine thermal cycle of steam power plants both in land and sea applications (to merchant and naval ships) is very interesting. This paper presents selected results of heat-and-flow investigations of a supercritical steam-water injector, obtained in Institute of Fluid Flow Machinery, Polish Academy of Sciences (IMP PAN). On their basis value of average heat transfer coefficient for mixing chamber was determined; the obtained values were even a few dozens greater than those for classical shell-and-tube heaters. In the theoretical part of this work is presented an original injector model based on balances of mass, momentum and energy, written for control volumes containing separately particular elements of injector. On the basis of the model flow parameters in characteristic cross-sections of injector were determined. The calulations were performed for two different injectors tested in IMP PAN (Gdańsk) and SIET (Piacenza, Italy), and their good compliance with experimental data was achieved.
Źródło:
Polish Maritime Research; 2009, S 1; 64-70
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of fouling thermal resistance of feed-water heaters in steam power plants
Autorzy:
Butrymowicz, D.
Głuch, J.
Hajduk, T
Trela, M.
Gardzilewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/259063.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
steam power unit
fouling
feedwater heaters
Opis:
In this paper a problem is discussed of thermal degradation of shell-and-tube recuperative feed-water heaters due to heat transfer surface fouling. Application (to an example steam cycle of power plant) of DIAGAR software system intended for the analysing of impact of degradation of a particular heat exchanger on whole recuperative system performance, is presented. On the basis of the systematically performed simulative calculations it was concluded that the degradation of feed-water heaters of the lowest extraction pressure results in an additional load imposed on the heaters of higher extraction pressures, moreover it was estimated that the degradation of the heaters due to presence of sediments of the thermal resistance reaching 5*10-4 m2*K/W, has resulted in the drop of turbine set efficiency by about 0.3%. Such drop depends on a given configuration of degree of degradation of particular feed-water heaters applied in a considered turbine set.
Źródło:
Polish Maritime Research; 2009, S 1; 3-8
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison analysis of selected nuclear power plants supplied with helium from high-temperature gas-cooled reactor
Autorzy:
Szewczuk-Krypa, N.
Drosińska-Komor, M.
Głuch, J.
Breńkacz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/258918.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
HTGR
nuclear power plants
floating marine plants
nuclear power
Opis:
The article presents results of efficiency calculations for two 560 MW nuclear cycles with high-temperature gas-cooled reactor (HTGR). An assumption was made that systems of this type can be used in so-called marine nuclear power plants. The first analysed system is the nuclear steam power plant. For the steam cycle, the efficiency calculations were performed with the code DIAGAR, which is dedicated for analysing this type of systems. The other system is the power plant with gas turbine, in which the combustion chamber has been replaced with the HTGR. For this system, a number of calculations were also performed to assess its efficiency. Moreover, the article names factors in favour of floating nuclear power plants with HTGRs, which, due to passive safety systems, are exposed to much smaller risk of breakdown than other types of reactors which were in common use in the past. Along with safety aspects, it is also economic and social aspect which make the use of this type of systems advisable.
Źródło:
Polish Maritime Research; 2018, S 1; 204-210
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie i kształtowanie rozwiązań obudów łukowo-prostych w warunkach doświadczeń KWK „Borynia-Zofiówka-Jastrzębie” Ruch „Jas-Mos”
The use and formation of a solution of linings straight-arch shaped in experiences’ condition “Jas-Mos” mine
Autorzy:
Celmer, M.
Chiliński, T.
Czarnecki, Z.
Stachura, W.
Słomian, A.
Głuch, P.
Powiązania:
https://bibliotekanauki.pl/articles/112702.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
górnictwo
budownictwo podziemne
obudowa
mining
underground construction
housing
Opis:
Obudowy łukowo-proste stanowią rozwiązanie konstrukcji obudowy w której prosty odcinek konstrukcji w części stropnicowej podparty jest stojakiem podporowym z jednej strony ociosu, a z drugiej strony ociosu ma kształt łukowy. Rozwiązanie obudowy znajduje zastosowanie w przecinkach zbrojeniowych, w przecinkach likwidacyjnych oraz w chodnikach przyścianowych. W artykule na podstawie doświadczeń zostaną przedstawione zalety ruchowe obudów łukowo-prostych jak i problemy ich stosowania oraz rozwiązania pozwalające poprawić ich nośność. Sformułowano wymogi techniczno-technologiczne warunkujące ich stosowanie w wyrobiskach kopalń węgla kamiennego.
The article discusses the use of a solution of linings straight-arch shaped where the straight section of construction is supported by stand supporting from the one side of side wall, from the other side of side wall is arch shaped. A solution of a support was used in liquidation duct, starting sidewalks and roadway. Based on experiences the article presents movement’s adventages of arch-straight supports, the problems of their usefulness and solutions in order to improve their carrying capacity. The technical and technological requirements are condition in use of coal mines’ excavation.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2016, 1 (13); 478-490
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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