PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 4

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  irregular wave
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Impact of waves on dangerous stability of vessels on the oceanic route
Szelangiewicz T., Żelazny K.
New Trends in Production Engineering
|
2018
|
Vol. 1, Iss. 1
469--477
EN
Stability is one of the most important properties of the ship. The greatest influence on stability and thus on the possibility of loss of stability have the rolling of the ship on the wave. Mathematical models describing rolling on wave are complicated, and their solution, especially in the irregular wave, is only possible with numerical methods in the time domain. Large rolling, until the ship capsize, formation not only on the beam wave, but also on the following wave. Various models describing rolling (linear and nonlinear, regular and irregular wave, and constant or variable restoring moment) are presented. The predicted level hazard of stability of the ship depends on the direction of the wave and the cases where the level of hazard will be greatest.
2
Content available Approximating the added resistance coefficient for a bulk carrier sailing in head sea conditions based on its geometrical parameters and speed
Cepowski T.
Polish Maritime Research
|
2016
|
nr 4
8--15
EN
The article presents the mathematical function to calculate the added wave resistance transfer function for bulk carriers. Based on this function, the statistical mean added wave resistance generated by an irregular head wave with arbitrary statistical parameters can be forecasted. The input parameters are: waterplane area, waterplane coefficient, ship speed, and frequency of the regular wave. The model has been developed based on the theory of artificial neural networks. The presented function can be used in design analyses, and for planning shipping routes in situations when basic geometrical parameters of the hull are only available and not the full technical documentation. The article presents sample cases of use of this function to calculate the added wave resistance transfer function and the statistical mean added wave resistance. Another presented application refers to waterplane coefficient optimisation taking into account the added wave resistance at the stage of preliminary bulk carrier design.
3
Content available remote Aproksymacja kołysań bocznych kontenerowca S-175 na fali nieregularnej oparta na parametrach eksploatacyjnych statku
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2005
|
nr 6 (78)
65-75
PL
Przedstawiono aproksymację kołysań bocznych kontenerowca S-175 na fali nieregularnej opartą na parametrach eksploatacyjnych statku. Wartości wzorcowe kołysań bocznych obliczono dokładnymi metodami numerycznymi za pomocą programu SEAWAY. Funkcję aproksymacyjną opracowano za pomocą sztucznych sieci neuronowych i przedstawiono w postaci analitycznej. Prezentowana metodyka może pozwolić na prognozowanie rzeczywistych wartości kołysań bocznych, opartych na danych zarejestrowanych na statku.
EN
The paper presents approximations of roll amplitudes of a S-175 containershipoccurring in irregular waves on the basis of main service parameters. Standard values of ship's roll were determined by means of exact numerical methods by using the SEAWAY software. The relationships were elaborated by means of artificial neural networks and presented as an analytical function. The proposed approach may be used to approximate real values of roll angle amplitude on the basis of data recorded onboard the ship during its service.
4
Content available Application of statistical methods and artificial neural networks for approximating ship's roll in beam waves
Cepowski T.
Polish Maritime Research
|
2005
|
nr 2
22-28
EN
In the paper, were presented approximations of numerical calculations of ship's roll on the basis of main service parameters of the ship. This way were obtained several relationships which make it possible to approximate ship roll in regular and irregular waves by using the parameters available in the phase of voyage routing. The relationships were elaborated by means of artificial neural networks as well as linear and non-linear regression methods. A comparative analysis of the methods regarding approximation accuracy against standard data was also performed.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.