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Wyszukujesz frazę "design wave" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Design wave calculation of a passenger catamaran under multiple load control parameters
Autorzy:
Ge, Shenwei
Ji, Zeng
Jin, Bowen
Zhou, Wen
Qin, Xiaolong
Powiązania:
https://bibliotekanauki.pl/articles/32898725.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
catamaran
load prediction
equivalent design wave
multiple load control parameters
Opis:
To determine the loading conditions considering the action of both bending and torque moment for a passenger catamaran moving among waves, a method for calculating equivalent design waves under multiple load control parameters was derived based on wave load prediction results using three-dimensional potential flow theory. The method was developed by defining the wave amplitude discrepancy factors between the primary and second load of the combined bending and torquing equivalent design wave. The primary goal was to find a reasonable design wave. Finally, the design waves of a target passenger catamaran ship were calculated using the proposed method, and each load component of every design wave for the target hull was recalculated. The average error compared with the object load component was less than 1%, which verifies the effectiveness of the method and offers an effective engineering evaluation method for a catamaran.
Źródło:
Polish Maritime Research; 2022, 2; 3-11
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on a method of hull form design based on wave-making resistance optimization
Autorzy:
Sun, Jianglong
Lv, Xujian
Liu, Weibin
Ning, Hanwen
Chen, Xianwen
Powiązania:
https://bibliotekanauki.pl/articles/259129.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hull lines design
wave-making resistance
optimization
Opis:
In this paper, we consider an optimization of the hull shape in order to minimize the total resistance of a ship. The total resistance is assumed to be the sum of the wave resistance computed on the basis of the thin-ship theory and the frictional resistance. Smoothness of hull lines is proved with mathematical procedure, in which differentials of the hull lines functions are analyzed. The wave-making resistance optimization, involving a genetic algorithm, uses Michell integral to calculate wave resistance. A certain hull form is generated by the method using cross section information of a modified DTMB model ship 5415 and a comparative experiment is carried out. Experimental and calculation result show that the method is of good adaptability for designing certain types of ships with excellent resistance performance.
Źródło:
Polish Maritime Research; 2012, 3; 16-25
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General strength, energy efficiency (EEDI), and energy wave criterion (EWC) of deadrise hulls for transitional mode
Autorzy:
Kanifolskyi, Oleksandr
Powiązania:
https://bibliotekanauki.pl/articles/32913092.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
energy wave criterion
energy efficiency factor
design accelerations
Opis:
In the modern world, environmental issues come to the fore. The document of MARPOL for reducing the emission of pollutants into the atmosphere relates to the energy efficiency coefficient EEDI . This coefficient is directly related to the power of the main engine and, accordingly, to the water resistance. The way to reduce the energy efficiency factor EEDI by increasing the relative length \( \frac{L}{ \sqrt[3]{V}} \) of the ship was proposed in this article. To determine the maximum value of the relative length, knowledge of the general strength of the vessel is required. The value of the relative section modulus of an equivalent girder for a small vessel of transitional mode is defined. The result of the graphic solution of two equations is the value of such a relative section modulus. This parameter is required to determine the limiting value of the relative length and to find solutions to reduce the coefficient EEDI . Comparative analysis of the obtained data with the data of the strength and weight of the H-girder with a length similar to the ship was conducted. The formula for determining the limiting value of the relative length was obtained from the equation of general strength. For a preliminary assessment of the future project of the ship, in terms of permissible design accelerations and the possibility of the ship moving against a sea wave of a certain height, a graph was built based on the application of the energy wave criterion EWCand the requirements of various classification societies.
Źródło:
Polish Maritime Research; 2022, 3; 4-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximating the added resistance coefficient for a bulk carrier sailing in head sea conditions based on its geometrical parameters and speed
Autorzy:
Cepowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/258482.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
bulk carrier
resistance
added wave resistance
added resistance coefficient
regular wave
irregular wave
ship designing
preliminary design stage
artificial neural networks
approximation
forecasting
speed
waterplane area
waterplane coefficient
sample case
task
designing
Opis:
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.
Źródło:
Polish Maritime Research; 2016, 4; 8-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of OFDM-based radio communication systems for coast-to-sea and coast-to-air propagation environments
Autorzy:
Gajewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/259888.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine radio communication
wave propagation at sea
ground-to-sea communication
ground-to-air communication
OFDM system design
safety at sea
Opis:
In the paper the study of radio communication system design process for systems based on OFDM transmission is considered. The signal propagation model for 1.4 GHz frequency band is discussed, and the study of signal propagation characteristics, important from the point of view of OFDM system design, is presented. The methodology of OFDM interface design is proposed and some characteristics of the OFDM-based radio communication system are analysed.
Źródło:
Polish Maritime Research; 2016, 1; 12-19
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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