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Wyświetlanie 1-15 z 22
Tytuł:
Analysis of hull resistance of pushed barges in shallow water
Autorzy:
Tabaczek, T.
Kulczyk, J.
Zawiślak, M.
Powiązania:
https://bibliotekanauki.pl/articles/260352.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways ship
hull resistance
Opis:
These authors performed a set of numerical calculations of water flow around pushed barges differing to each other by bow forms. The calculations were executed by means of FLUENT computer software. Turbulent free-surface flow of viscous liquid was considered. In this paper the calculated values of barge hull resistance split into bow, cylindrical and stern part components, have been compared and presented.
Źródło:
Polish Maritime Research; 2007, 1; 10-15
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of optimum hull form for passenger car ferry with regard to its sea-keeping qualities and additional resistance in waves
Autorzy:
Cepowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/258898.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sea-keeping qualities
roll-on/roll-off ferry ship
rolling
transverse accelerations
vertical accelerations
motion sickness index
additional resistance in waves
ship hull form
ship design parameters
artificial neural networks
fuzzy logic
Opis:
This paper presents a method which makes it possible to determine optimum hull form of passenger car ferry with regard to selected sea-keeping qualities and additional resistance in waves. In the first phase of investigations a hull form characterized by the highest qualities was selected from the list of similar ships. Next, its optimum dimension ratios were determined. Design criteria were formulated by using a method based on deterministic scenarios, but objective functions of partial targets were determined in the form of artificial neural networks. To select the best design variants elements of fuzzy logic were used, that made it possible a.o. to show merits of the design by means of linguistic variables. Such approach made it possible to find the best hull form and its dimensions from the point of view of all considered criteria simultaneously.
Źródło:
Polish Maritime Research; 2008, 2; 3-11
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part I. Influence of hull form modification on ship resistance characteristics
Autorzy:
Szelangiewicz, T.
Abramowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/258900.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hull geometry
computational fluid dynamics (CFD)
resistance
wake
propeller efficiency
Opis:
After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of 3 parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
Źródło:
Polish Maritime Research; 2009, 4; 3-8
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part II. Influence of hull form modification on wake current behind the ship
Autorzy:
Abramowski, T.
Szelangiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/259395.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hull geometry
numerical (computational) fluid dynamics
resistance
wake
propeller efficiency
Opis:
After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
Źródło:
Polish Maritime Research; 2010, 1; 3-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of influence of ship hull form modification on ship resistance and propulsion characteristics. Part III. Influence of hull form modification on screw propeller efficiency
Autorzy:
Abramowski, T.
Żelazny, K.
Szelangiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/259371.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hull geometry
numerical (computational) fluid dynamics (CFD)
resistance
wake current
propeller efficiency
Opis:
After signing ship building contract shipyard’s design office orders performance of ship resistance and propulsion model tests aimed at, apart from resistance measurements, also determination of ship speed, propeller rotational speed and propulsion engine power for the designed ship, as well as improvement of its hull form, if necessary. Range of ship hull modifications is practically very limited due to cost and time reasons. Hence numerical methods, mainly CFD ones are more and more often used for such tests. In this paper consisted of three parts, are presented results of numerical calculations of hull resistance, wake and efficiency of propeller operating in non-homogenous velocity field, performed for research on 18 hull versions of B573 ship designed and built by Szczecin Nowa Shipyard.
Źródło:
Polish Maritime Research; 2010, 1; 10-13
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application artificial neural networks for predicting wave resistance of ro-ro ferry in initial designing stage
Zastosowanie sztucznych sieci neuronowych do prognozowania dodatkowego oporu od fali promu ro-ro na wstępnym etapie projektowania
Autorzy:
Cepowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/360042.pdf
Data publikacji:
2011
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
prom ro-ro
sztuczne sieci neuronowe
dodatkowy opór od fali
aproksymacja
parametry kształtu kadłuba
ro-ro ferries
artificial neural networks
added wave resistance
approximation
hull shape parameters
Opis:
The paper presents approximations of added wave resistance useful in the early stage of designing ro-ro ferries. Reference added wave resistance values were calculated by means of SEAWAY software based on accurate numerical methods. Approximating function was elaborated by using the artificial neural networks. The model values were calculated by means of 448 ferry shape variants assuming conventional waving parameters and ferry movement parameters. Such approach permitted the replacement of the complicated numerical model with a simple analytical model based on basic hull shape parameters.
W pracy przedstawiono aproksymacje dodatkowego oporu od fali przydatne na wstępnym etapie projektowania promów ro-ro. Wartości wzorcowe dodatkowego oporu od fali obliczono przy użyciu programu SEAWAY. Aproksymacje opracowano za pomocą sztucznych sieci neuronowych. Wartości wzorcowe obliczono dla 448 wariantów kształtu promu, przyjmując umowne parametry falowania oraz parametry ruchu promu. Takie podejście pozwoliło zastąpić skomplikowany model numeryczny prostym modelem regresyjnym, bazującym na podstawowych parametrach geometrycznych kadłuba.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2011, 26 (98); 10-14
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of armoured vehicles bottom shape on the pressure impulse
Autorzy:
Barnat, W.
Panowicz, R.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/243701.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IED
improvised explosive device
mine resistance
armour
deflector
hull design
light armoured vehicle
Opis:
This paper presents the results of a numerical analysis of military vehicles hulls mine resistance. The research concerns armours loaded with blast wave from large IED charges in three cases. First is an explosion in Euler domain without any boundary conditions. Second consists of Euler domain with flat bottom and the ground. Third is simulated Euler domain with ground and deflector. Boundary conditions used both in second and third case resulted in growth of the pressure impulse due to the reflection from a rigid obstacle. In the article different hull bottom shapes are compared. The gap between the bottom and the ground is fixed in all cases. Explosion in Euler domain without limitations is added as a reference. The blast wave caused by the detonation (simulated as a point detonation) propagated in cubic mesh with appropriate boundary conditions. Theoretical solution of spherical non-linearity is given in a form of Taylor equations. It was used to verify the numerical model. The research showed that the ground proximity affects the results of the simulation. The pressure impulse is amplified due to the wave reflection from both the bottom of the vehicle and the ground. As well as that, the study confirmed that the usage of the deflector considerably reduces the impact load to the structure.
Źródło:
Journal of KONES; 2011, 18, 1; 39-46
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of deflectors angle influence on energy absorption
Autorzy:
Gieleta, R.
Barnat, W.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/241835.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IED
improvised explosive device
hull resistance
deflector
Opis:
Numerical simulations without preliminary validation and model verification are vulnerable to errors. Best results are obtained when full experimental research is provided. Such tests are expensive and may be dangerous. Due to cost control and personnel safety, studies are often done in scale. Scale can affect both construction dimensions and applied load. In this paper four different vehicle's bottoms are examined: flat bottom and 3 types of deflectors. The paper presents four different vehicle's bottom shapes in order to examine deflector angle influence on energy absorption. The test included 4 cases: flat bottom broken-shaped deflector and deflectors with different apex angles 124 centigrade and 144 centigrade. For all cases the distance between explosive and panel was approximately 400 mm. The charge used was 100 g TNT. Flat bottom and deflectors were made of St3 steel with 2 mm thickness. For the purpose of the research a special test stand to examine effects of detonation wave was used. The force measurement system was designed in Department of Mechanics and Applied Computer Science. As a result, force versus time plots were obtained. The use of any deflector decreases maximum force affecting vehicle's hull.
Źródło:
Journal of KONES; 2012, 19, 4; 201-205
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Linearization of the ship equations of motion
Autorzy:
Mielewczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/245238.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
mechanical engineering
Maritime Engineering
nonlinear differential equations
linearization
resistance of hull
error solutions
Opis:
In real systems are non-linear mathematical description. The exact solution can not be determined, and then look for approximate methods. Important is the type of nonlinearity, solutions and error method approximation. Linearization is an essential part of creating a model of the selected process. Ship resistance is a function of power with exponent two and higher. Model motion of the ship must have a solution in terms of maneuverability speed and speed of the sea. The solution must be well reproduce the actual path of the transition and the transition time of the ship. Nonlinear solution method determines the accuracy of the answers. Has presented the revised approach to solve the nonlinear differential equation of parabolic function. Linearization has been made in the selected range, and not where you want it to work and solve the error estimate. Range of solutions selected by external priorities adopted. Before the solution is estimated response error. The error value determines whether the selected interval will apply. If the problem solution is unacceptable, it will increase the accuracy of the result of the narrow scope of the work. The new scope of work should also be reassessed a solution error. This type of approach correlates with fuzzy logic, where we use the value of the Boolean variable with the function of belonging. The combination of classical methods of solving differential equations of the theory of fuzzy sets can bring new benefits. Such a solution must have the function of the accuracy of the answers. The linearization method meets this requirement.
Źródło:
Journal of KONES; 2013, 20, 2; 269-275
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test research on the resistance performance of high-speed trimaran planing hull
Autorzy:
Ma, W.
Sun, H.
Zou, J.
Yang, H.
Powiązania:
https://bibliotekanauki.pl/articles/259708.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
trimaran planing hull
side hulls
high speed
step
resistance
model test
Opis:
In order to identify high-speed navigation ability of trimaran planing hull, as well as investigate the characteristics of its resistance and hull form, ship model tests were conducted to measure resistance, trim and heaving under different displacements and gravity centre locations. The test results were then used to study the influence of spray strips on resistance and sea-keeping qualities. Moreover, different planning surfaces were compared in the model tests which helped to look into influence of steps on hull resistance and its moving position. Also, the resistance features of monohull and trimaran planing hulls, both with and without steps, were compared to each other. From the tests it can be concluded that: the two auxiliary side hulls increase aerodynamic lift at high-speed motion, which improves the hydrodynamic performance; the trimaran planing hull has also excellent longitudinal stability and low wave-making action; when Fr∇> 8, its motion is still stable and two distinct resistance peaks and two changes of sailing state (the second change is smaller) appear; spray strips are favourable for sea-keeping qualities at high speed. The change trends before the second resistance peak as to the resistance and sailing behaviour of trimaran planing hull without steps are the same as for monohull planing hull without steps. but when steps in both hulls exist the change trends are different; more specifically: trimaran planing hull with steps has only one resistance peak and its resistance increases along with its speed increasing, and the resistance is improved at the increasing speed as the number of steps increases.
Źródło:
Polish Maritime Research; 2013, 4; 45-51
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kadłuby laminatowe dla okrętów zwalczania min : problemy technologiczne
Polymer composites in minehunters hull construction : technological problems
Autorzy:
Grządziela, A.
Powiązania:
https://bibliotekanauki.pl/articles/278066.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
kadłub okrętu
niszczyciel min
wybuch podwodny
laminat GRP
GRP
odporność udarowa
odkształcenie sprężyste
ship hull
minehunter
underwater explosion
GRP laminate
impact resistance
elastic deformation
Opis:
Artykuł przedstawia problem obliczeń konstrukcji kadłubów niszczycieli min wykonanych z laminatów GRP. Scharakteryzowano zadania niszczycieli min oraz przedstawiono problem odporności udarowej na falę detonacji podwodnej. Wskazano metody obliczeń parametrów fali wywołującej odkształcenia sprężyste kadłuba okrętowego oraz oddziaływanie dynamiczne na struktury wewnętrzne. Przedstawiono współcześnie stosowane metody realizacji konstrukcji kadłubów GRP oraz łączenia z elementami stalowymi.
The paper presents the problem of calculating the hull structures of minehunters made from GRP laminates. It characterizes the task of minehunters and presents the problem of impact resistance to the waves of underwater detonations. This method of calculating the parameters of the indicated wave causing elastic deformation of the hull of the ship and dynamic effects on the internal structures. The paper presents the implementation of modern methods of constructing GRP hulls and connecting laminate with steel part.
Źródło:
Przetwórstwo Tworzyw; 2014, [R.] 20, nr 1 (157), 1 (157); 21-27
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial considerations for operational parameters intended to minimize fuel consumption by ships in real weather conditions
Autorzy:
Cepowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/135261.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship
vessel
operating
fuel
fuel consumption
speed
velocity
weather
modeling
rpm
engine
hull
propeller
thrust
resistance
added resistance
Opis:
The paper presents the concept of modeling a ship’s operating parameters in order to minimize the fuel consumption in real weather conditions. This is an important innovation because, in ship theory, fuel consumption and speed are usually expressed by average values over longer periods of time, which is a significant limitation. This article presents selected topics of the proposed research such as state-of-the-art, general objectives, scientific and technical expectations, scientific and economic extensions, and environmental impacts. The article also proposes an original method of the research.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 43 (115); 9-14
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test studies of the resistance and seakeeping performance of a trimaran planing hull
Autorzy:
Ma, W.
Sun, H.
Zou, J.
Zhuang, J.
Powiązania:
https://bibliotekanauki.pl/articles/259495.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
trimaran planing hull
appendix
resistance
seakeeping
model test
Opis:
Towing tank tests in calm water were performed on a trimaran planing hull to verify its navigational properties with different displacements and centres of gravity, as well as to assess the effects of air jets and bilge keels on the hull’s planing capabilities, and to increase the longitudinal stability of the hull. Hydrostatic roll tests, zero speed tests, and sea trials in the presence of regular waves were conducted to investigate the hull’s seakeeping ability. The test results indicate that the influence of the location of the centre of gravity on the hull resistance is similar to that of a normal trimaran planing hull; namely, moving the centre of gravity backward will reduce the resistance but lower the stability. Bilge keels improve the longitudinal stability but slightly affect the resistance, and the presence of air jets in the hull’s channels decreases the trim angle and increases heaving but has little effect on the resistance. Frequent small-angle rolling occurs in waves. The heaving and pitching motions peak at the encounter frequency of , and the peaks increase with velocity and move towards greater encounter frequencies. When the encounter frequency exceeds, the hull motion decreases, which leads to changes in the navigation speed and frequency.
Źródło:
Polish Maritime Research; 2015, 1; 22-27
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy saving procedures for fishing vessels by means of numerical optimization of hull resistance
Autorzy:
Abramowski, T.
Sugalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/135190.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
CFD
hull shape optimization
fishing boat
hull resistance
OpenFoam
simulation
Opis:
This paper presents the general method for hull shape optimization of fishing boats with the objective of reducing resistance. In particular, it presents an example of the results of the application of resistance-reducing devices such as the ducktail, the cylindrical bulb and the streamlined bulbous bow. The resistance was determined using computational fluid dynamics (CFD). For the purpose of flow simulation, the OpenFoam system, distributed under an open source license, was used. The turbulent, unsteady flow with free surface liquid around the analyzed hulls was computed and investigated for potential resistance reduction. Ultimately, the calculation results were generalized by the parameterization of dimensionless geometric variables for the shape of a bulbous bow and were given in a form suitable for practical application in the hull design process.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 19-27
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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