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Wyświetlanie 1-15 z 353
Tytuł:
Application of CFD for analysis of the ship and propeller flow
Autorzy:
Bugalski, T. J.
Szantyr, J.
Powiązania:
https://bibliotekanauki.pl/articles/1953974.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
computational fluid dynamics CFD
CFD
propeller flow
ships
Navier-Stokes equation
free surface
propeller operation
PANSHIP computer system
Opis:
The paper describes the computer system PANSHIP for analysis of flow around the ship hull moving with constant velocity in calm water, including the effects of free surface and propeller operation. This system calculates the potential flow using the discrete distribution of Rankine sources on the hull. Viscous flow is computed using the integral method in the bow section and Reynolds averaged Navier Stokes equation (RANS) in the stern section of the ship hull. Results of this analysis may be directly used in ship hull design and they may also serve as input for calculation of the unsteady flow phenomena accompanying propeller operation in the non-uniform velocity field generated by the hull. PANSHIP has been verified experimentally and it forms a useful tool available for ship designers and for marine hydrodynamicists.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 349-356
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern numerical techniques for the ships safety estimation in critical conditions
Autorzy:
Gerigk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1954534.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
design of ships
ships hydromechanics
safety of ships
design of safety
Opis:
In this paper a method for a ship safety estimation at the preliminary stage of design is briefly presented. Solving a few hydrostatic and dynamical problems may be taken into account using the method with special regards to the ships safety estimation in critical conditions. The critical conditions may concem the problems of survivability caused due to the cargo and/or ballast shift, waves and wind impact including the ingress of external water into the watertight compartments of a ship. The theoretical and computational models are briefly described. Using the computational model the safety assessment may be done for the initial event and scenario development assumed. Then, either some seakeeping, stability, damage stability or survivability related characteristics should be evaluated for the risk assessment. Both the seakeeping and stability characteristics are treated as the initial conditions for the risk assessment regarding the damage stability and survivability, and it usually follows from the hazard scenario development. The risk assessment is the base for the safety estimation. This is done according to the IMO regulations. The computational model incorporates the modern numerical techniques and is briefly described by introducing the logical structure of design system, logical structure of computational model and a few application methods used. The model enables to estimate the safety combining the influence of the hull form parameters, arrangement of internal spaces, loading condition including both the cargo distribution and permeability and impact of exciting forces. The exciting forces may follow from both the external and internal sources. And they are as follows: waves, wind and cargo and ballast shift.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 2; 201-225
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An attempt of the specification of the ships navigation process
Autorzy:
Kopacz, Z.
Morgaś, W.
Urbański, J.
Powiązania:
https://bibliotekanauki.pl/articles/320944.pdf
Data publikacji:
2001
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
statki
navigation
ships
Opis:
An attempt of the specification of main issues, such as the objectives, tasks, activities, etc. which are being solved and are being done while the ship is conducted at sea is undertaken in the paper. These issues constitute the substance of the ship’s navigation process and all its sub process. The authors’ belief is that the specification of these issues would enable the better understanding the matter of ship’s navigation process. It could also facilitate the preparation of more precise algorithms of all navigation sub processes, i.e. even those which hardly could be expressed by the means of mathematical relations.
Źródło:
Annual of Navigation; 2001, 3; 91-109
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical basis of the probalilistic-fuzzy method for assessment of dangerous situation of a ship manoeuvring in a restricted area
Autorzy:
Pietrzykowski, Z.
Gucma, L.
Powiązania:
https://bibliotekanauki.pl/articles/320942.pdf
Data publikacji:
2001
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
manewrowanie
statki
bezpieczeństwo nawigacyjne
navigation
manoeuvring
ships
safety navigation
Opis:
The paper presents theoretical basis of the probabilistic-fuzzy method for assessing the safety of a ship manoeuvring on fairways. The method allows to account for such different states / conditions as the danger to the safety and the intuition that the safety of a ship manoeuvre is threatened, based on the probabilistic analysis of risk and elements of fuzzy logic. A dangerous navigational situation is defined as a fuzzy event. Two methods of determining the probability of a fuzzy event occurrence are presented. The results are compared with those obtained from a quantitative method of safety assessment based on probabilistic methods.
Źródło:
Annual of Navigation; 2001, 3; 111-125
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the probablistic-fuzzy method for assessment of a dangerous situation of a ship manoeuvring in a restricted area
Autorzy:
Pietrzykowski, Z.
Gucma, L.
Powiązania:
https://bibliotekanauki.pl/articles/320591.pdf
Data publikacji:
2002
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
bezpieczeństwo nawigacyjne
manewrowanie
statki
navigation
safety navigation
manoeuvring
ships
Opis:
This article presents practical application of the probabilistic-fuzzy method for assessment of the safety of a ship manoeuvring in fairways. The method, based on the probabilistic risk analysis and elements of fuzzy logic, allows to account for a situation of threatened safety and a situation when a navigator intuitively thinks that the safety of manoeuvring ship is threatened. The probability of grounding of a ship manoeuvring in a fairway bend was determined. Then, with the use of experts’ knowledge and tools of fuzzy logic the probability of a dangerous situation was determined. Two different approaches, discussed in Part 1, have been applied for the determination of the probability. The results were compared.
Źródło:
Annual of Navigation; 2002, 4; 59-70
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezier approach to smoothing zig-zag data for use in ship maneuvering model identification
Autorzy:
Artyszuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/320484.pdf
Data publikacji:
2002
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
manewrowanie
statki
modele matematyczne
krzywe Beziera
navigation
manoeuvring
ships
mathematical model
Bézier curve
Opis:
The Bezier curve is used as a basis of zig-zag data approximation. It improves an estimate of external excitations acting during such a type of maneuver. In addition to the previous report about a turning test modeling, this makes available most of the existing full-scale trial results for the force-based identification of ship maneuvering mathematical model.
Źródło:
Annual of Navigation; 2002, 4; 5-12
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Errors in the presentation of the vessels course and speed for the VTS operator
Autorzy:
Śniegocki, H.
Powiązania:
https://bibliotekanauki.pl/articles/320589.pdf
Data publikacji:
2002
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
nawigacja
bezpieczeństwo nawigacyjne
safety navigation
safety of ships
navigation
Opis:
The paper presents some results based on the research made in the VTS Gdańsk area. Conclusions from the experiments shows that errors in the presentation of ships course and speed on the VTS operator console may not allow to VTS operator to react in time to solve the gangerous situation.
Źródło:
Annual of Navigation; 2002, 4; 79-88
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 353

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