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

Znaleziono wyników: 46

Liczba wyników na stronie
first rewind previous Strona / 3 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 3 next fast forward last
1
Content available Determination of regression formulas for key design characteristics of container ships at preliminary design stage
Abramowski T., Cepowski T., Zvolenský P.
New Trends in Production Engineering
|
2018
|
Vol. 1, Iss. 1
247--257
EN
This article presents regression equations to estimate container ship design characteristics based on the most up-to-date data and deadweight capacity, the number of containers and their combination at the preliminary design stage. These design formulas could have application for the estimation of key container ship characteristics such as: main ship dimensions, geometric parameters, main engine total power, ship velocity, final price and others. Regression equations were performed on the basis of IHS Maritime & Trade main container ship data built from 2005-2015. All equations presented in this paper could have practical application at the preliminary design stage and increase ship design theory development.
2
Content available Identification Accuracy of Additional Wave Resistance Through a Comparison of Multiple Regression and Artificial Neural Network Methods
Cepowski T.
Multidisciplinary Aspects of Production Engineering
|
2018
|
Vol. 1, Iss. 1
197--204
EN
The article presents the use of multiple regression method to identify added wave resistance. Added wave resistance was expressed in the form of a four-state nominal function of: “thrust”, “zero”, “minor” and “major” resistance values. Three regression models were developed for this purpose: a regression model with linear variables, nonlinear variables and a large number of nonlinear variables. The nonlinear models were developed using the author's algorithm based on heuristic techniques. The three models were compared with a model based on an artificial neural network. This study shows that non-linear equations developed through a multiple linear regression method using the author’s algorithm are relatively accurate, and in some respects, are more effective than artificial neural networks.
3
Content available Interim fuel consumption estimation based on ship service parameters in real weather conditions with the use of ndCurveMaster curve fitting software
Cepowski T., Drozd A.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2017
|
nr 50 (122)
30--35
EN
This paper deals with fuel consumption estimations relating to container ships on the basis of ship service and wave parameters. Data, on which to base estimations, was measured and recorded from a container ship during 96 months at sea. Approximating functions were calculated by the use of curve fitting techniques and regression methods, utilizing newly developed software named ndCurveMaster. The approximation function presented in this paper could have practical application for the estimation of container ship fuel consumption, while considering weather routing. In addition the study clearly shows the relationship between the fuel consumption of a container ship and the number of months since its last docking. These results may form the basis for further research in this direction.
4
Content available Prediction of the main engine power of a new container ship at the preliminary design stage
Cepowski T.
Management Systems in Production Engineering
|
2017
|
nr 2 (25)
97--99
EN
The paper presents mathematical relationships that allow us to forecast the estimated main engine power of new container ships, based on data concerning vessels built in 2005-2015. The presented approximations allow us to estimate the engine power based on the length between perpendiculars and the number of containers the ship will carry. The approximations were developed using simple linear regression and multivariate linear regression analysis. The presented relations have practical application for estimation of container ship engine power needed in preliminary parametric design of the ship. It follows from the above that the use of multiple linear regression to predict the main engine power of a container ship brings more accurate solutions than simple linear regression.
PL
W publikacji przedstawiono matematyczne zależności pozwalające na prognozowanie szacunkowej mocy napędu nowo budowanych kontenerowców w latach 2005-2015. Przedstawione aproksymacje pozwalają na oszacowanie mocy napędu w oparciu o długość między pionami i liczbę kontenerów. Aproksymacje zostały opracowane przy wykorzystaniu regresji liniowej jednej i wielu zmiennych. Przedstawione zależności mają praktyczne zastosowanie do szacowania mocy napędu kontenerowca dla potrzeb wstępnego parametrycznego projektowania statku. Z badań wynika, że zastosowanie regresji wielu zmiennych daje dokładniejsze rozwiązania niż zastosowanie regresji jednej zmiennej.
5
Content available Prediction of a newbuilding proce of the bulk carriers based on gross tonnage gt and main engine power
Cepowska Ż., Cepowski T.
Management Systems in Production Engineering
|
2017
|
nr 1 (25)
42--45
EN
The paper presents mathematical relationships that allow us to forecast the newbuilding price of new bulk carriers, based on data concerning vessels built in 2005-2015. The presented approximations allow us to estimate the price based on a gross tonnage capacity and a main engine power The approximations were developed using linear regression and the theory of artificial neural networks. The presented relations have practical application for estimation of bulk carrier newbuilding price needed in preliminary parametric design of the ship. It follows from the above that the use of artificial neural networks to predict the price of a bulk carrier brings more accurate solutions than linear regression.
PL
W publikacji przedstawiono matematyczne zależności pozwalające na prognozowanie ceny budowy masowców budowanych w latach 2005-2015. Przedstawione aproksymacje pozwalają na oszacowanie ceny w oparciu o pojemność rejestrową GT i moc napędu. Aproksymacje zostały opracowane przy wykorzystaniu regresji liniowej i teorii sztucznych sieci neuronowych. Przedstawione zależności mają praktyczne zastosowanie do szacowania ceny budowy masowca dla potrzeb wstępnego parametrycznego projektowania statku. Z badań wynika, że zastosowanie sztucznych sieci neuronowych do prognozowania ceny masowca przynosi dokładniejsze rozwiązania niż wykorzystanie regresji liniowej.
6
Content available Projecting sale prices of new container ships built in 2005–2015 based on DWT and TEU capacities
Cepowski T.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2016
|
nr 48 (120)
171--175
EN
This paper presents mathematical relationships that allow forecast of the estimated sale price of new container ships, based on data concerning vessels built in 2005–2015. The presented approximations allow estimation of the price based on deadweight capacity (DWT) or the number of containers the ship will carry (TEU). The approximations were developed using linear regression and the theory of artificial neural networks. The presented relations have practical relevance in the estimation of container ship sale price needed in transport studies or preliminary parametric design of the ship. It follows from the above that the use of artificial neural networks to predict the price of a container ship brings more accurate solutions than linear regressions.
7
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.
8
Content available Seakeeping software for the analysis of a ship’s seaworthiness
Cepowska Ż., Cepowski T.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
nr 42 (114)
95--100
EN
The article presents the Seakeeping research software, developed for the computation of a ship’s motions in regular and irregular waves on the basis of the following ship parameters: length between perpendiculars, beam, draught, block coefficient and transverse initial metacentric height. The software implements approximating functions of amplitude-phase characteristics of rolling, heaving, and pitching, developed by the author by means of artificial neural networks. The software determines transfer functions for the phenomena accompanying the rolling motion, such as slamming, green water, propeller surfacing, vertical acceleration forward and on the bridge. The article discusses possible uses of the software in scientific research, ship design and operation, and for educational purposes.
9
Content available Initial considerations for operational parameters intended to minimize fuel consumption by ships in real weather conditions
Cepowski T.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2015
|
nr 43 (115)
9--14
EN
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.
10
Wskazówki projektowe do obliczania nośności i maksymalnego zanurzenia statku rybackiego na wstępnym etapie projektowania
Cepowski T.
Logistyka
|
2015
|
nr 3
651--659, CD 1
PL
W artykule przedstawiono wskazówki projektowe do obliczania zanurzenia maksymalnego kutra rybackiego eksploatowanego w warunkach zbliżonych do rzeczywistych warunków eksploatacji kutrów rybackich. W badaniach zdefiniowano warunki eksploatacji jak najbardziej zbliżone do rzeczywistych warunków eksploatacji wybranych kutrów rybackich. W głównej części pracy opracowano uproszczone zależności matematyczne do obliczenia nośności i zanurzenia maksymalnego na wstępnym etapie projektowania. Na końcu artykułu przedstawiono przykład obliczania zanurzenia maksymalnego wybranych kutrów rybackich w oparciu o opracowane zależności matematyczne.
EN
The paper presents design guidelines for the calculation of the maximum draft of fishing vessel operated under conditions similar to real operating conditions. The study defined operating conditions as close as possible to the real operating conditions selected fishing vessels. The main part of the work are simplified mathematical function for the calculation of deadweight and maximum draft at the preliminary design stage. At the end of the article is an example of the calculation of the maximum draft fishing vessels based on developed mathematical formulas.
11
Content available The “Fast Stability” computer program used for training in maritime schools
Cepowska Ż., Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2014
|
nr 39 (111)
47--52
EN
This paper presents computer software “FastStability”. The software has been developed for all kind of vessels and calculates stability with many additional options. The “Fast Stability” program is used in Post- Secondary Maritime School in Szczecin in education purpose.
12
Content available Longitudinal strength problems in design of ships for loading nodules at sea
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2014
|
nr 39 (111)
53--56
EN
The naval architect has to tackle many of the problems, while designing ships for the loading, storage and transport of polymetallic or other nodules, this article focuses on how to assure appropriate hull strength. This author proposes mathematical relationships and operational and design solutions allowing to more effectively reduce shear forces and bending moments during the loading of nodules in the open sea. The suggested solutions may be used in the design of ships intended for such or other functions.
13
Content available The computer software “Egzamin” for the assessment of education in the maritime schools
Cepowska Ż., Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2013
|
nr 35 (107)
11--14
EN
This paper presents innovative software “Egzamin” for examination used in Post-Secondary Maritime School in Szczecin. Presented software, unlike other similar programs, allows the assessment of student skills based on the task as a test of closed and open. The software is based on a databases working in the computer local network. The software is allowed to backup all exams including student’s personal data, evaluation of all responses and time taken to solve each task. The software can also be used in e-learning.
14
Content available Innovative software for planning and simulation of cargo handling and ballast water exchange on the ship
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2013
|
nr 35 (107)
15--21
EN
The paper presents an innovative computer programs “Kalkulator” and “Sekwencja” for planning and simulation of cargo handling operations and the exchange of ballast water for bulk carrier B-517 series. The software is designed to develop and simulate particular loading stages based on the loading programs or water ballast exchange plans. The programs presented in article show new trends in development of loading calculators.
15
Content available The prediction of the Motion Sickness Incidence index at the initial design stage
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2012
|
nr 31 (103)
45-48
EN
The article discusses the influence of those environmental conditions on the human being that may cause sea sickness. Different indexes describing motion sickness are presented. Besides, a mathematical inter-relation describing the effect of waves and design parameters on the motion sickness incidence index is described. The relation has been used for developing design guidelines designers may use at the initial design phase.
16
Content available Modeling of ship seakeeping properties by descriptive variables at the preliminary design stage
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2012
|
nr 29 (101)
21-24
EN
The article describes a method of ship seakeeping characteristics modeling that are represented by descriptive variables. The research aimed at checking the possibility of using artificial neural networks for building models based on descriptive values of seakeeping properties and finally, developing design guidelines. The article reports an experiment of modeling a situation of shipping green water by a container vessel. The experiment verifies the theoretically adopted method.
PL
W artykule przedstawiono metodę modelowania właściwości morskich przedstawionych za pomocą zmiennych opisowych. Celem badań było sprawdzenie możliwości wykorzystania sztucznych sieci neuronowych do budowania modeli bazujących na wartościach opisowych właściwości morskich i na tej podstawie opracowywanie wskazówek projektowych. W artykule przeprowadzono przykładowy eksperyment numeryczny modelowania zalewania pokładu kontenerowca, weryfikujący wstępnie przyjętą metodę.
17
Content available Modelling of seakeeping ability of FPSO vessels
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2011
|
nr 25 (97)
13-20
EN
Problems concerning preliminary design of FPSO vessels are presented in view of their seakeeping ability. The article analyzes the presently applied approach in which seakeeping quality of FPSO vessels is taken into consideration and discusses possibilities of using this approach at the preliminary stage of design. Besides, the current approach used for predicting such phenomena as heaving, slamming and green water loading is discussed.
PL
W artykule przedstawiono problematykę projektowania wstępnego statków FPSO, biorąc pod uwagę właściwości morskie tych statków. W artykule przeanalizowano aktualnie stosowane podejście, dotyczące uwzględniania właściwości morskich statków FPSO i możliwości wykorzystania tego podejścia na wstępnym etapie projektowania. W artykule przedstawiono aktualnie stosowane podejście do prognozowania m.in. nurzań, slemingu i zalewania pokładu statków FPSO.
18
Content available Application artificial neural networks for predicting wave resistance of ro-ro ferry in initial designing stage
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2011
|
nr 26 (98)
10-14
EN
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.
PL
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.
19
Content available Modelling of seakeeping qualities of open-top container carriers in the preliminary design phase
Cepowski T.
Polish Maritime Research
|
2011
|
nr 2
19-27
EN
In this paper are presented problems of modelling seakeeping qualities of open-top container carriers in the preliminary design phase. Approximations of accelerations and occurrence rate of green water ingress to holds are presented in function of main ship design and wave parameters. The approximations have been elaborated by applying theory of artificial neural networks in the wide range of ship hull dimensions and forms, while ship motion and wave parameters have been limited to real operational conditions described by means of the so called operational scenario. Such approach has made it possible to reach high accuracy of approximation and simple structure of mathematical model simulatneously.
20
Wybrane problemy projektowania wstępnego statków FPSO
Cepowski T.
Logistyka
|
2011
|
nr 3
PL
W artykule przedstawiono problematykę projektowania wstępnego statków FPSO, aktualnie stosowane kryteria oraz ograniczenia projektowe tej grupy statków istotne z punktu projektowania wstępnego. W artykule przeanalizowano aktualnie stosowane podejście dotyczące uwzględniania właściwości morskich statków FPSO i możliwości wykorzystania tego podejścia na wstępnym etapie projektowania. W pracy zamieszczono statystyczne wartości parametrów projektowych nowobudowanych statków FPSO, które mogą być przydatne na wstępnym etapie projektowania.
EN
The paper presents the preliminary design issues of FPSO vessels, the currently used criteria and design constraints of this group of vessels relevant to the preliminary design stage. The paper examines the approach for taking into account the FPSO seakeeping properties, and the possibility of using this approach to the preliminary design stage. The paper presents statistical values of design parameters new-builded FPSO vessels, which may be useful at the preliminary design stage.
first rewind previous Strona / 3 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.