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Wyświetlanie 1-15 z 43
Tytuł:
Experimental evaluation of forward speed effect on maneuvering hydrodynamic derivatives of a planing hull
Autorzy:
Kazerooni, M. F.
Seif, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/135366.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
planing hull
maneuvering
model test
derivative
hydrodynamic
Opis:
The calculation of unknown hydrodynamic derivatives of the equations of motion is the first step to estimate ship maneuverability and dynamic stability. These derivatives can be obtained theoretically, experimentally and numerically. Despite the development of the oblique towing model test to measure the hydrodynamic derivatives of displacement ships, limited experimental results are available for hydrodynamic derivatives of high speed crafts and speed dependency of the hydrodynamic derivatives is not understood well. In this paper a systematic series of model tests is described to determine the effect of forward speed on hydrodynamic derivatives of a monohull planing craft and the variations of the hydrodynamic derivatives by forward speed are derived. According to the results, hydrodynamic derivatives of planing hull are dramatically changed by variations of forward speed. Moreover, it is not possible to introduce a constant hydrodynamic derivative in the all the ranges of drift angle. Thus, the method of known constant hydrodynamic derivatives is not applicable to the simulation of planing craft maneuvering and variable hydrodynamic derivatives should be applied.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 40-53
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Confrontational Argumentative Strategies in the Discourse of Foreign Policy Experts
Autorzy:
Allani, Samira
Powiązania:
https://bibliotekanauki.pl/articles/1026728.pdf
Data publikacji:
2019-03-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
argumentation
discourse
experts
foreign policy
strategic maneuvering
Opis:
The aim of this study is to explore the discursive practices of foreign policy experts. While policy decisions involving war and peace keep people alarmed all over the globe, most of these decisions are shaped by policy experts who work on influencing public opinion through the media (Manheim, 2011). This study adopts a critical discursive stance and uses argumentation analysis to examine the ideological backdrop to the discourse of thirty opinion articles authored by American foreign policy experts in print media. Drawing on the Pragma-dialectical method of augmentation analysis (van Eemeren and Grootendorst, 2004), and more particularly on its notion of strategic maneuvering, the analysis examines the confrontational strategies used by this group of experts and attempts to determine the rhetorical goals pursued by these strategic maneuvers.
Źródło:
Research in Language; 2019, 17, 1; 39-55
1731-7533
Pojawia się w:
Research in Language
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamental Study of Evaluation at Berthing Training for Pilot Trainees Using a Ship Maneuvering Simulator
Autorzy:
Inoue, K.
Okazaki, T.
Murai, K.
Hayashi, Y.
Powiązania:
https://bibliotekanauki.pl/articles/117099.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
pilot navigation
Ship Maneuvering Simulator
Maritime Simulation
Opis:
Use of the ship maneuvering simulator (SMS) is at the core of pilot trainees education and training, so it is desirable to have an evaluation method that can be completed shortly after each berthing training session. There are basically two methods of docking maneuvering that pilot trainees learn: one in which the ship enters from outside the port and is berthed directly at the target quay, and a second method in which the vessel carries out a turn in front of the target quay before berthing. The authors suggested an evaluation index in a previous study concerning the first docking method. In the present study, the authors propose an evaluation method for the case of berthing the vessel using the turning maneuver. Since the index obtained by this method offers a single numerical benchmark, it is an easy–to‐understand result of the training exercise. The authors carried out experiments using a SMS and confirmed that the proposed evaluation method is effective and helpful to improve the effectiveness of SMS training.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 135-141
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Model of Uncertainty of Ships Safety Maneuvering Area Determination
Autorzy:
Montewka, J.
Powiązania:
https://bibliotekanauki.pl/articles/320567.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
bezpieczne manewrowanie
niepewność
safety maneuvering
uncertainty
Opis:
The paper presents uncertainty model of the original method based on optoelectronic measurements used for ship's safety maneuvering area determination. The method takes advantage of land borne laser rangefinder and encoder measurements. The results obtained from the method are compared with results obtained from GNSS RTK method and the uncertainty model is evaluated and implemented.
Źródło:
Annual of Navigation; 2008, 13; 75-86
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent Prediction of Ship Maneuvering
Autorzy:
Łącki, M.
Powiązania:
https://bibliotekanauki.pl/articles/116074.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
future of navigation
ship maneuvering
intelligent prediction
prediction of ship maneuvering
neuroevolution
navigational parameters
intelligent ship
autonomous control unit
Opis:
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.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 3; 511-516
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 study to assess the effect of ship beam on the navigable flow conditions in Paris
Autorzy:
Mansuy, M.
Candries, M.
Eloot, K.
Page, S.
Powiązania:
https://bibliotekanauki.pl/articles/24201436.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
inland navigation
ship maneuvering simulator
real time simulation
waterway design
seine river
container transport
bridge
simulation of ship maneuvering
Opis:
Traversing the river Seine in Paris is challenging for inland vessels due to the density and diversity of local traffic that is encountered in a confined environment. The waterway authority, Voies navigables de France (VNF), commissioned a study to assess the relevance of the current regulations when vessels of varying types cross Paris. A first simulation study showed that regulations based on length only may be too restrictive for ships with smaller beams [1]. This paper presents additional simulations executed on a full mission bridge simulator with ships of reduced beam. The main bottlenecks happen at different locations depending on the ship’s beam and ships with smaller beam can sail at higher water levels than the ships considered in the first study. The maximum water levels for which safe passage is possible were determined for each ship. Finally, recommendations have been formulated, which were then discussed with VNF and stakeholders.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 25--31
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Universal Simulation Method for Determining the Maneuverability of Ferry Based on the Example of Ystad Port
Autorzy:
Gucma, L.
Gralak, R.
Muczyński, B.
Powiązania:
https://bibliotekanauki.pl/articles/320470.pdf
Data publikacji:
2018
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
maneuverability
maneuvering safety
traffic engineering
ferry
simulation
Opis:
The paper describes a universal simulation method used by the authors to determine the conditions of safe operation of sea ferries, in terms of marine traffic engineering. The assumptions, simulation experiment and results are described on the example of the m/f Mazovia manoeuvring in the Port of Ystad. Carried out and described in the article simulation study using the present method was aimed to determine the possibility of adapting the propulsion and steering systems of the ferry including: 1) determination of the wind limits in the Port of Ystad in terms of Mazovia ferry operation; 2) assessment of the maneuvering safety in a port area and determination of conditions of safe operation with present propulsion and steering systems; 3) determination of the possibility of adapting the propulsion and steering systems to meet the requirements of the shipowner for the economically efficient and safe operation of the ferry.
W artykule opisano uniwersalną metodę symulacji używaną przez autorów dla określania bezpiecznych warunków operowania przez promy morskie w kontekście zasad inżynierii morskiej. Założenia, eksperyment symulacji i wyniki są opisane na przykładzie m/f Mazowsza manewrującego w Porcie Ystad. Badania symulacyjne oparte o powyższą metodę i opisane w artykule zakładały określenie możliwości dostosowania systemów napędowych i sterowania promów włącznie z: 1) określeniem ograniczeń wiatru w porcie Ystad w kontekście możliwości manewrowych promu Mazovia; 2) oszacowanie bezpieczeństwa manewrów w porcie oraz określenia warunków bezpieczeństwa operacji przy obecnych systemach napędowych i sterowych; 3) określenie możliwości dostosowania układów napędowych i sterowych dla spełnienia oczekiwań armatora odnośnie ekonomiki i bezpieczeństwa operacji promowych.
Źródło:
Annual of Navigation; 2018, 25; 51-65
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrodynamic Analysis of Trimaran Vessels
Autorzy:
Javanmardi, M. R.
Jahanbakhsh, E.
Seif, M. S.
Sayyaadi, H.
Powiązania:
https://bibliotekanauki.pl/articles/258654.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
trimaran
resistance
maneuvering
computational fluid dynamics (CFD)
Opis:
Trimaran vessels are developed for different applications and hydrodynamic behavior of such vessels is different than usual mono-hulls. In this paper hydrodynamic resistance and maneuvering of a trimaran with Wigley body form are investigated. The effects of outriggers position in four different longitudinal and two transverse locations are studied. For hydrodynamic simulations a CFD code has been developed and used. This code is capable for simulating three dimensional, time dependent, two phases, viscous flow coupled with rigid body motion. Formulation and solution algorithm are described in detail. Different case studies have been performance and numerical results have shown good agreement with experimental data. Based on resistance and maneuvering simulation of the trimaran vessels different conclusion are made. The results show that positions of outriggers have great effect on resistance and maneuverability of trimaran. The present method can be further employed to investigate other hydrodynamic qualities of trimaran vessels.
Źródło:
Polish Maritime Research; 2008, 1; 11-18
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ad hominem and false analogy abuses in a Romanian intellectual debate
Autorzy:
Pănoiu, Valeriu-Mihai
Powiązania:
https://bibliotekanauki.pl/articles/2188251.pdf
Data publikacji:
2022-10-24
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie. Instytut Filozofii i Socjologii
Tematy:
pragma-dialectics
argumentation
strategic maneuvering
fallacies
status groups
Opis:
A pragma-dialectical inside view of a Romanian intellectual debate is meant to unveil strategic maneuvering and fallacies, in a public sphere said to be dominated by “status groups”, “backstage maneuvers” and “conspiracy”. A book written by a Romanian author sparked off an area of disagreement leading to ad hominem attacks and false analogies ranging from postcommunist issues to political correctness.
Źródło:
ARGUMENT: Biannual Philosophical Journal; 2022, 12, 1; 59-74
2083-6635
2084-1043
Pojawia się w:
ARGUMENT: Biannual Philosophical Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probability of Ship on Collision Courses Based on the New PAW Using MMG Model and AIS Data
Autorzy:
Asmara, I.P.S.
Kobayashi, E.
Artana, K.B.
Powiązania:
https://bibliotekanauki.pl/articles/116367.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Modeling of Maneuvering of Ships
Crash Astern Maneuvers
anticollision
mathematical model
Maneuvering
Potential Area of Water (PAW)
Automatic Identification System (AIS)
AIS Data
Opis:
This paper proposes an estimation method for ships on collision courses taking crash astern maneuvers based on a new potential area of water (PAW) for maneuvering. A crash astern maneuver is an emergency option a ship can take when exposed to the risk of a collision with other ships that have lost control. However, lateral forces and yaw moments exerted by the reversing propeller, as well as the uncertainty of the initial speed and initial yaw rate, will move the ship out of the intended stopping position landing it in a dangerous area. A new PAW for crash astern maneuvers is thus introduced. The PAW is developed based on a probability density function of the initial yaw rate. Distributions of the yaw rates and speeds are analyzed from automatic identification system (AIS) data in Madura Strait, and estimated paths of the maneuvers are simulated using a mathematical maneuvering group model.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 1; 43-50
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship course-keeping with neuroevolutionary algorithms
Autorzy:
Łącki, M.
Powiązania:
https://bibliotekanauki.pl/articles/135344.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship course-keeping
neuroevolution
autopilot
ship maneuvering
artificial intelligence
algorithm
Opis:
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.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 54 (126); 70-74
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Wake Assessment of Maneuvering Ship
Numeryczna analiza strumienia nadążającego manewrującego statku
Autorzy:
Abramowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/360179.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
nominalny strumień nadążający
manewrowanie
EXPLO-SHIP 2004
nominal wake
maneuvering
Opis:
The article presents an attempt at numerical wake determination of a ship moving with drift. For the calculation of viscous flow a numerical method based on the solving of RANS equations has been applied. A bulk carrier hull has been chosen for the analysis. The results show complex features of the flow in the stern area. Distributions of wake factor are strongly non-uniform both in radial and circumferential directions and the non-uniformity gets stronger as drift angle increases.
Zaprezentowano próbę numerycznej oceny strumienia nadążającego statku poruszającego się z dryfem. Obliczenia opływu lepkiego wykonano metodą opartą na rozwiązaniu równań RANS. Do analizy wybrano kadłub masowca. Obliczenia wskazują na skomplikowane parametry przepływu w rejonie rufy. Rozkłady współczynników strumienia nadążającego są silnie niejednorodne tak promieniowo, jak i obwodowo i niejednorodność ta wzrasta wraz ze wzrostem kąta dryfu.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 2 (74); 21-31
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propulsion and maneuvering systems’ characteristics of the U.S. flagged great lakes self-unloading bulk carriers
Autorzy:
Przybylski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073547.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
vessel propulsion
vessel maneuvering
bulk carrier
Great Lakes bulk carrier
self-unloader
Opis:
Paper contains an overview of the propulsion and maneuvering systems’ characteristics of United States flagged Great Lakes self - unloading bulk carriers. A contrast between the importance of the transport task carried by those vessels to their low number and considerable age suggests the need to review and understand their complexity as well as complexity of their operations in order to provide suitable energy- and operational efficiency upgrades. Such review can prove to be challenging due to limited information available in the literature. Environment in which those vessels operate and their operational profile have been also reviewed due to the fact that they gave rise to the unique hull - form that subsequently influenced the propulsion and maneuvering system design in a significant manner. The environment and operational profile were also found to influence propulsion and maneuvering systems’ form more directly: through the requirements posed on vessels maneuvering capabilities and propulsive power requirements.
Źródło:
Journal of Polish CIMEEAC; 2018, 13, 1; 78--88
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal for Global Standard Maneuvering Orders for Tugboats
Autorzy:
Ishikura, A.
Sugita, K.
Hayashi, Y.
Murai, K.
Powiązania:
https://bibliotekanauki.pl/articles/116726.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Manoeuvrability
Tugboats
Standard Maneuvering Orders
Tug Orders
Standard Maneuvering Orders for Tugboats
IMO Standard Marine Communication Phrases (SMCP)
communication among bridge team
Bridge Team Management
Opis:
The use of “Standard Maneuvering Orders” for tugboats, vocabulary and phrases mutually preagreed between ships and tugboats, is essential for the former to provide clear direction for the latter when berthing or un‐berthing safely. Tugboats will need time to change their posture before they take actions in response to orders from persons responsible for ships’ maneuvering. Therefore, when giving directions to change tugboats’ posture, persons who handle their ships are required to send out tug orders, with regard to “delay time,” a gap be‐tween the orders from ships and the actions taken by tugboats. “Tug Orders” standardized and used in Japan are composed of the following three factors concerning towage work: tugboat’s motion, direction and engine power, but the author’s research shows that there are “Non‐standard” special maneuvering orders other than those “standardized,” which causes such problems as a gap in perception between pilots and tugboat’s opera‐tors, etc. The purpose of this paper is to research the delay time between orders for and actions by tugboats and consider the appropriate and safe timing of providing instructions to them, and then to propose globally‐authorized “Standard Maneuvering Orders for tugboats”, discussing a problem involved in the use of the special orders used in Japan, and the way in which tug orders are used in other countries.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 509-513
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of ships moving in opposing directions among ice floes
Autorzy:
Goncharov, V.
Klementieva, N.
Zueva, E.
Powiązania:
https://bibliotekanauki.pl/articles/135677.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
collision
computer simulation
ice floe
maneuvering
mathematical model
navigation
side force
yawing moment
Opis:
During winter in arctic seas, navigation of ships near ports occurs within ice channels created and maintained by icebreakers. Small ice floes fill the relatively narrow navigable channel, and ships are forced to produce the overtaking or opposing separation over short distances and under the action of ice floes. This paper presents an analytical model of the interaction of ships under the conditions just described as well as the results of a simulation. The simulation showed side force and yawing moments were dependent on ice conditions and the ship’s dimensions and motion characteristics.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 91-98
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 43

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