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Wyświetlanie 1-15 z 113
Tytuł:
Analysis of the relevant parameters on small scale of navigable abnormal ship model
Autorzy:
Cai, C.
Lei, P.
Cai, X.
Powiązania:
https://bibliotekanauki.pl/articles/259654.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic model
similarity criterion
abnormal ship model
Opis:
At present, ship model tests are based on the normal mode at home and abroad. With the development and application of abnormal hydraulic model, it is necessary to study abnormal ship model. The similarity criterion of abnormal ship model is deduced from the similarity theory of normal hydraulic model in this paper. Some factors that affect the maneuverability of the abnormal ship model are discussed by theoretical analysis of ship maneuvering. The influence of the K and T index of different variable rate on the abnormal ship model maneuvering and the dimensional effect of the abnormal ship model are obtained, which can be used as a reference for the study of the abnormal ship model.
Źródło:
Polish Maritime Research; 2017, S 2; 133-139
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An approximate method for calculating the resistance of a transport ship model
Autorzy:
Szelangiewicz, Tadeusz
Żelazny, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/135240.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
friction resistance
total resistance
approximation of ship model resistance
autonomous ships
unmanned surface vessel (USV)
ship model
Opis:
The article presents regression formulas for calculating the friction resistance RF and the total resistance RT of ship models in the 2.0–10.0 m range. The method for calculating the total resistance is novel and applies to the design models of an unmanned surface vessel (USV) for experimental testing of autonomous control. For both regression models (RF and RT), statistical and substantive tests were performed (the results of the calculations were compared with the experimental measurements). In both cases, convincing results were obtained, which have confirmed the possibility of their use at the preliminary design stage of unmanned ship models.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 64-71
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic model of ship traffic congestion in waterways for two different traffic solutions based on the Świnoujście– Szczecin case study
Autorzy:
Gucma, L.
Bąk, A.
Gucma, M.
Powiązania:
https://bibliotekanauki.pl/articles/135048.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship congestion model
ship stream model
waterway design
modeling
waterway
simulation
Opis:
The paper presents stages of stochastic ship traffic stream model creation which was applied for the optimization of different solutions for the Świnoujście–Szczecin waterway design. The model is based on Monte Carlo methodology and is microscopic, which means that each ship’s model is treated as a separate object possessing given attributes. The main output from the model is the sum of the delay time of waiting ships and the distribution of ships’ queue. Two alternative waterway traffic solutions with different passing places for ships were analyzed in this study and compared with each other. The model was used for the first time for the optimization of the modernized Szczecin–Świnoujście waterway in respect of two different solutions of passing places for ships.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 42 (114); 63-69
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of lake waves to simulate environmental disturbance to a scale ship model
Autorzy:
Rak, Andrzej
Miller, Anna
Powiązania:
https://bibliotekanauki.pl/articles/34614624.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wave modeling
environmental disturbances
scale ship model
ship motion simulation
Opis:
In the development of ship motion control systems, software simulations or scale model experiments in pools or open water are very often carried out in the verification and testing stages. This paper describes the process of building a software wave simulator based on data gathered on the Silm Lake near Iława, Poland, where scale ship models are used for research and training. The basis of the simulator structure is a set of shaping filters fed with Gaussian white noise. These filters are built in the form of transfer functions generating irregular wave signals for different input wind forces. To enable simulation of a wide range of wind speeds, nonlinear interpolation is used. The lake wave simulation method presented in this paper fills a gap in current research, and enables accurate modelling of characteristic environmental disturbances on a small lake for motion control experiments of scale model ships.
Źródło:
Polish Maritime Research; 2023, 3; 12-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model tests in open waters – a concept that did pay off
Autorzy:
Kobyliński, L.
Powiązania:
https://bibliotekanauki.pl/articles/259970.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
high-speed craft
ship model tests
ship hydrodynamics
development of ship hydrodynamics science in Poland
Opis:
The paper presents the concept of performing model tests in open waters. This concept was realized in the Ilawa Experimental Station arranged on the shore of the Jeziorak Lake in 1956. Since then model tests of high-speed craft, manoeuvrability and propulsion characteristics of conventional seagoing ships and inland waterways push tugs-barges systems have been performed there. New concepts of how to perform the tests were developed. The advantages of performing model tests in open waters were stressed and future possible applications suggested. The activity of the experimental station that belonged to the Technical University of Gdańsk greatly contributed to.
Źródło:
Polish Maritime Research; 2007, S 2; 20-24
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopping of Ships Equipped with Azipods
Autorzy:
Nowicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/117172.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Azipods, Propeller
Stopping od Ships
Ship Propulsion
ship model
Stopping Tests
LNG Carrier
Stopping Manoeuvres
Opis:
The paper contains a description of different possibilities of stopping a large ship equipped with azipods. The model tests were carried out to compare the effectiveness of stopping the ship using the different methods. The ship model used in stopping tests reproduces a large LNG carrier of capacity ~150 000 m3.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 373-376
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A historical review of ship model testing in open waters
Autorzy:
Kastner, S.
Powiązania:
https://bibliotekanauki.pl/articles/258486.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
capsizing of ships
free-running ship model
open water testing
random seaway
Opis:
Specific features of model testing on hydrodynamic ship behaviour will be discussed, in particular with respect to extreme motions in a natural seaway of open waters. Ship model features described are model scale, water tightness, auto - pilot and remote control, data recording, testing procedures and choice of model situations. Wave gauges supported by buoys allowed measuring seaway. Logistics of open water model testing is compared with new procedures in water tanks generating seaway extremes. A short glimpse is given concerning results found with respect to ship capsizing in random seas. Some photographs allow a lively remembrance of early activities in model runs on a lake many decades ago.
Źródło:
Polish Maritime Research; 2007, S 2; 29-32
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura systemu sterowania statkiem dynamicznie pozycjonowanym
Structure of control system dynamically positioned ship
Autorzy:
Śmierzchalski, R.
Powiązania:
https://bibliotekanauki.pl/articles/266323.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
sterowanie statkiem
DP
dynamiczne
pozycjonowanie
model statku
wymagania statku DP
dynamic positioning
control structure of the ship DP
ship model
ship requirement
Opis:
W artykule przedstawiono funkcje i zadania systemu dynamicznego pozycjonowania (DP) statku. Omówiono zagadnienia sterowania - stabilizacji pozycji i kierunku (kursu rzeczywistego statku) przy małej prędkości manewrowania oraz modele statku DP. Określono wymagania towarzystw klasyfikacyjnych dla statków DP. Przedstawiono wielowarstwową strukturę systemu sterowania statkiem DP, gdzie do podstawowych problemów należy zaliczyć filtrację sygnałów oraz estymację wielkości mierzonych i niemierzonych, dobór metody sterowania i regulatora DP oraz alokację sterów i napędów.
The article presents the functions and tasks of the system dynamic positioning (DP) of ship. Control problems were discussed - to stabilize the position and direction (the ship's course) at low speed maneuverability and also ship models DP. It specifies the requirements of classification societies for ships DP. The article discusses the multilayer structure of the ship DP control system, where the basic problems include filtering signals and estimation of the size of the measured and unmeasured, choice of control methods and monitoring and the allocation of the DP drives.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 193-196
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic Model of Ships Traffic Capacity and Congestion - Validation by Real Ships Traffic Data on Świnoujście - Szczecin Waterway
Autorzy:
Gucma, L.
Bąk, A.
Sokołowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/1203873.pdf
Data publikacji:
2017
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
ship traffic stream model
waterway capacity
ship intensity
congestion
ships traffic streams
Opis:
Paper presents validation of previously created stochastic ships traffic stream model by the real data of ships delays on Świnoujście — Szczecin waterway. The model is mostly based on Monte Carlo methodology. The model is microscopic which means that each ship’s model is treated as separate object possessing given attributes. As the main parameter of presented validation total waiting (delay) time of ships have been applied. The time of ships delays was possessed from Szczecin VTS centre and compared with the model output.
W artykule przedstawiono wyniki walidacji wcześniej stworzonego stochastycznego modelu strumienia ruchu statków przez porównanie z rzeczywistymi danymi o opóźnieniu statków na drodze wodnej Świnoujście — Szczecin. Model został zbudowany w oparciu o metodologię Monte Carlo. Jest to model z kategorii „mikroskopowych”, co oznacza, że każdy statek jest traktowany jako odrębny obiekt, cechujący się indywidualnymi atrybutami. Jako główny parametr walidacji przyjęto całkowity czas oczekiwania (opóźnienia) statków. Czas definiujący opóźnienie statków został pozyskany z centrum VTS Szczecin i porównany z wynikami modelowymi.
Źródło:
Annual of Navigation; 2017, 24; 177-191
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic model of ship traffic congestion in waterways applied to determine the influence of Liquefied Petroleum Gas tanker introduction on ship traffic on the Świnoujście–Szczecin waterway
Autorzy:
Gucma, L.
Bąk, A.
Sokołowska, S.
Hajduk, J.
Powiązania:
https://bibliotekanauki.pl/articles/135318.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship traffic stream model
waterway capacity
ship intensity
congestion
Monte Carlo methodology
determination
Opis:
This paper presents the stages in stochastic ship traffic stream model creation, applied to determine the influence of liquefied petroleum gas (LPG) tanker introduction to Police Port on the Świnoujście–Szczecin waterway. The model is based on the Monte Carlo methodology, and is microscopic (which means that each ship’s model is treated as a separate object possessing given attributes). The model is applied here in order to find the influence of ships with dangerous cargo (LPG tankers in the case study) on regular ship traffic, and hence to establish whether special traffic solutions are necessary.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 69-74
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulator of a model ship’s unmanned movement
Autorzy:
Szelangiewicz, Tadeusz
Żelazny, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/135658.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
experimental model of an unmanned ship
ship’s manoeuvring equations
propulsion system
computer simulator
mathematical model of the ship
unmanned ship
Opis:
As part of this research, an experimental model of an unmanned ship equipped with an ecological electric drive was built. Ultimately, the ship model was equipped with an on-board computer with appropriate software for autonomous control. A computer simulator was used to test the control software. This article presents the concept of such a simulator, a general mathematical model of the movement dynamics of an unmanned vehicle, a description of the propulsion system, and the tasks planned for implementation in a computer simulator.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 59 (131); 34-40
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model tests for shallow-water ship maneuverability in Three Gorges Reservoir
Autorzy:
Cai, C.
Cai, X.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/259922.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
shallow-water test of ship model
simulated computation
maneuverability calibration
scale effect
Z shape test
K and T indexes
navigation safety
Opis:
This paper conducts calibration tests on the shallow-water maneuverability of 1:100 ship models for the typical navigation fleets in Three Gorges Reservoir. Major influential factors for the maneuverability similitude between models and prototypes and for scale effect were identified. A correction method for model scale was also established through model tests. Test results indicate that, by correcting the model scales of various fleets based on scale effect, the maneuverability indexes K’ (dimensionless of K) and T’ (dimensionless of T) of ship models are suitable for shallowwater tests, and properly reflect the maneuvering characteristics of prototypes. The findings provide an experimental basis for the navigation safety in Three Gorges Reservoir.
Źródło:
Polish Maritime Research; 2015, S 1; 136-140
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Ship Maneuvering Model Using Extended Kalman Filters
Autorzy:
Shi, C.
Zhao, D.
Peng, J.
Shen, C.
Powiązania:
https://bibliotekanauki.pl/articles/116777.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Manoeuvring
Ship Manoeuvering Model
Kalman filter
extended Kalman filter (EKF)
Ship Manoeuvrability
ship handling simulator
Turning Circle Test
Zig-Zag Test
Opis:
Ship maneuvering models are the keys to the research of ship maneuverability, design of ship motion control system and development of ship handling simulators. For various frames of ship maneuvering models, determining the parameters of the models is always a tedious task. System identification theory can be used to establish system mathematical models by the system’s input data and output data. In this paper, based on the analysis of ship hydrodynamics, a nonlinear model frame of ship maneuvering is established. System identification theory is employed to estimate the parameters of the model. An algorithm based on the extended Kalman filter theory is proposed to calculate the parameters. In order to gain the system’s input and output data, which is necessary for the parameters identification experiment, turning circle tests and Zig-zag tests are performed on shiphandling simulator and the initial data is collected. Based on the Fixed Interval Kalman Smoothing algorithm, a pre-processing algorithm is proposed to process the raw data of the tests. With this algorithm, the errors introduced during the measurement process are eliminated. Parameters identification experiments are designed to estimate the model parameters, and the ship maneuvering model parameters estimation algorithm is extended to modify the parameters being estimated. Then the model parameters and the ship maneuvering model are determined. Simulation validation was carried out to simulate the ship maneuverability. Comparisons have been made to the simulated data and measured data. The results show that the ship maneuvering model determined by our approach can seasonably reflect the actual motion of ship, and the parameter estimation procedure and algorithms are effective.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 1; 105-110
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a critical area for a give-way ship in a collision encounter
Autorzy:
Krata, P.
Montewka, J.
Powiązania:
https://bibliotekanauki.pl/articles/223997.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maritime traffic safety
collision risk
anticollision
ship's motion model
ship domain
bezpieczeństwo ruchu morskiego
ryzyko kolizji
zapobieganie kolizji
ruch statku
model ruchu statku
Opis:
Evasive action in ship-ship encounter has to be carried out on time and in line with the international convention on collision regulation – COLREG. The convention not only includes a set of rules defining types of relations between encountering ships but also indicates appropriate action to be taken in a given encounter. One of such encounters is crossing, where, in case of a collision situation, a give-way ship has to take an appropriate action in due time. However, a stand-on vessel is also given an opportunity to manoeuver, if it is made clear to her that the other ship is not fulfilling her obligations. However, it is difficult to specify, at which point in time in the course of an encounter, the stand-on ship has to take an action in order to avoid collision. It is understandable, as this parameter depends on numerous factors, both endogenous (e.g. ship characteristics, her maneuverability), and exogenous (e.g. type of encounter, weather conditions). Therefore in this paper we make an attempt towards the definition of the critical area for a maneuver of a stand-on ship, in the situation where the give-way vessel does not take an action. This is determined with the use of a hydrodynamic model of ship motion, and series of simulations conducted for several types of encountering ships under various conditions. Once determined, the critical area demarcates the no-go area around the own ship, where any other ships on collision courses must not enter. Otherwise a collision cannot be avoided by an action of one ship alone.
Źródło:
Archives of Transport; 2015, 34, 2; 51-60
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical estimation of hull hydrodynamic derivatives in ship maneuvering prediction
Autorzy:
Kołodziej, Radosław
Hoffmann, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1551776.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
captive model tests
CFD tools in maneuvering prediction
MOERI Container ship (KCS)
Hull hydrodynamic derivatives
Mathematical model of ship motion
Opis:
Prediction of the maneuvering characteristics of a ship at the design stage can be done by means of model tests, computational simulations or a combination of both. Th e model tests can be realized as a direct simulation of the standard maneuvers with the free running model, which gives the most accurate results but is also the least aff ordable, as it requires a very large tank or natural lake, as well as the complex equipment of the model. Alternatively, a captive model test can be used to identify the hydrodynamic characteristics of the hull, which can be used to simulate the standard maneuvers with the use of dedicated soft ware. Two types of captive model tests are distinguished: circular motion tests (CMT) and planar motion mechanism tests (PMM). Th e paper presents an attempt to develop a computational method for ship maneuverability prediction in which the hydrodynamic characteristics of the hull are identifi ed by means of computational fl uid dynamics (CFD). Th e CFD analyses presented here directly simulate the circular motion test. Th e resulting hull characteristics are verifi ed against the available literature data, and the results of the simulations are verifi ed against the results of free running model tests. Reasonable agreement shows the large potential of the proposed method.
Źródło:
Polish Maritime Research; 2021, 2; 46-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
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