Temat: Ship Motion - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effects of ship motion on acoustic remote sensing
Autorzy:: Tegowski, J.
Zielinski, A.
Tematy:: ship motion
acoustic remote sensing; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/332057.pdf Link otwiera się w nowym oknie
Opis:: Ship motion affects quality of acoustic data collected by various acoustic remote sensing systems used for bottom and fisheries surveying. The angular position of an acoustic beam changes in time from its nominal position vertical to sea surface. This motion affects the acoustic returns from the bottom and other targets by changing their intensity and arrival times. In this paper we illustrate these effects on bottom returns obtained using single beam sonar.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: New concept of numerical ship motion modelling for total ship operability analysis by integrating ship and environment under one overall system
Autorzy:: Olszewski, H.
Ghaemi, H.
Tematy:: ship motion modelling
ship operability
total system; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259338.pdf Link otwiera się w nowym oknie
Opis:: The paper presents a new concept of overall ship motion modelling for application to total ship operability. The delivered model is a multi-phase and includes both submerged part of ship’s hull and the surrounding water as a unique body. The Discrete Finite Element Method is applied. The model is successfully examined and illustrated for a selected AHTS.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 3.

Tytuł:: An Algorithm for Interpolating Ship Motion Vectors
Autorzy:: Hu, Q.
Cai, F.
Yang, C.
Shi, C.
Tematy:: Ship Motion
Ship Motion Vector
Automatic Identification System (AIS)
AIS Dynamic Information
Algorithm, Ship's Acceleration
AIS Data
Vector Function; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116863.pdf Link otwiera się w nowym oknie
Opis:: Interpolation of ship motion vectors is able to be used for estimating the lost ship AIS dynamic information, which is important for replaying marine accidents and for analysing marine traffic data. The previous methods can only interpolate ship’s position, while not including ship's course and speed. In this paper, vector function is used to express the relationship between the ship’s time and space coordinates, and the tangent of the vector function and its change rate are able to express physical characteristics of ship’s course, speed and acceleration. The given AIS dynamic information can be applied to calculate the parameters of ship's vector function and then the interpolation model for ship motion vectors is developed to estimate the lost ship dynamic information at any given moment. Experiment results show that the ship motion vector function is able to depict the characteristics of ship motions accurately and the model can estimate not only the ship’s position but also ship’s course and speed at any given moment with limited differences.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Improvement of the theory of ship’s motions on gyrocompass operation
Autorzy:: Lushnikov, E. M.
Pleskacz, K.
Tematy:: ship's motion
gyrocompass
accuracy
wave action
gravity; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/359270.pdf Link otwiera się w nowym oknie
Opis:: The article presents the results of compliance with effects of impact wave course and the resulting orbital motions on the accuracy of the gyrocompass.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modelling of lake waves to simulate environmental disturbance to a scale ship model
Autorzy:: Rak, Andrzej
Miller, Anna
Tematy:: wave modeling
environmental disturbances
scale ship model
ship motion simulation; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/34614624.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Determination of seakeeping performance for a case study vessel by the strip theory method
Autorzy:: Niklas, Karol
Karczewski, Artur
Tematy:: ship design
seakeeping
ship motion
added resistance
towing tank
strip theory; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/1573815.pdf Link otwiera się w nowym oknie
Opis:: The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the operational capacity and propulsion efficiency of the ship, as well as on comfort and safety of navigation. The article analyses selected aspects of seakeeping for four variants of a selected case study vessel, indicating practical limitations of the strip method. The analysed aspects included hull heaving and pitching, added resistance, Motion Thickness Indicator (MSI), and Subjective Magnitude (SM). Experimental tests were also performed in the towing tank. Their comparison with the numerical results has indicated high inaccuracy of the strip method. What is more, the simplified representation of hull shape used in the strip method makes it impossible to analyse the effect of hull shape changes on the predicted seakeeping characteristics. Especially for the case of head wave, neglecting highly non-linear phenomena, such as slamming or head wave breaking, in strip method-based computer simulations will significantly decrease the reliability of the obtained results. When using the strip method, the seakeeping analysis should be complemented with model tests in a towing tank, or by another more complex numerical analysis, such as CFD for instance.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 7.

Tytuł:: Niezawodność operacyjna skrzyżowania tras morskich : podejście symulacyjne
Operational reliability of ships route crossing : simulation approach
Autorzy:: Blokus-Roszkowska, A.
Smolarek, L.
Tematy:: transport morski
skrzyżowanie tras żeglugowych
ruch statku
martime transport
ship routes' intersection
ship's motion; Pokaż więcej
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Powiązania:: https://bibliotekanauki.pl/articles/311395.pdf Link otwiera się w nowym oknie
Opis:: Transport morski odgrywa niezmiernie istotną rolę i jest podstawą handlu międzynarodowego. Wraz ze wzrostem natężenia ruchu morskiego zwiększa się potrzeba dalszego podniesienia bezpieczeństwa na morzu. W artykule przedstawiono model opisujący ruch statków skrzyżowania dróg morskich pod kątem niezawodności operacyjnej. Rozważamy klasyczne skrzyżowanie tras żeglugowych oraz rondo przy założeniu pierwszeństwa z prawej oraz pierwszeństwa na rondzie. System traktowany jest jako wielostanowy model z stanem niezawodności oraz stanem zawodności z zerowym i niezerowym czasem odnowy. Do opisu ruchu statków w pracy zastosowany został model prostego automatu komórkowego, który stanowi podstawę symulacji. Ruch statku określony jest poprzez jego kierunek, prędkość i długość statku. Obszar skrzyżowania oraz trasy podzielone są na komórki. Rozmiar komórki zależy od intensywności strumienia ruchu, prędkości poruszania się oraz rozmiaru statków. Przeprowadzono symulacje ze względu na zmiany natężenia ruchu na kierunkach kolizyjnych oraz statystyczną analizę wyników symulacji. Wnioski i uwagi końcowe wytyczają dalszy kierunek prac.
Maritime transport is of great importance as it is the basis of international trade. Together with the growth of maritime traffic intensity the need of further safety development at sea is increasing. In the paper the model describing ships' motion at routes crossing in terms of operational reliability is presented. There are considered classical ship routes' crossing and roundabout with two vessel priority scenarios. One assuming priority of vessel being on starboard and second assuming priority of vessel being on the roundabout. The system is discussed as a multistate model with reliability state and unreliability state with ignored and non-ignored time of renovation. In the paper for the description of ships motion the simple cellular automaton model, that provides the basis for the simulation, is applied. The motion of the ship is determined by its direction, velocity and length of the ship. The traffic lanes are divided into cells. The length of the cell depends on the flows' intensities, vessels' velocities and size. The simulation is performed on account of traffic flow intensity changing and statistical analysis of simulation results is given. Final conclusion and remarks outline further work development.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Variations of Ship’s Deck Elevation Due to Stochastic Process of Containers Loading
Autorzy:: Krata, P.
Tematy:: Containerization
Containers Loading
Ship's Deck Elevation
Stochastic Process
ship's stability
Container Terminal
Ship's Motion
Cargo Loading; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116250.pdf Link otwiera się w nowym oknie
Opis:: The stochastic process of container loading is described in the paper with special emphasis to ship motion when she is lying at a quay. The 3 DOF system was applied to describe rolling, pitching and heaving of a vessel which may cause a significant variations of momentary deck elevation. The realistic range of such variations are assessed for a variety of cargo locations on-board and a phase shift between two independent gantries engaged in cargo operations. The process is modeled with regard to random character of crucial variables affecting ship motion due to cargo loading.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: A formal description of navigational process
Autorzy:: Jackowski, K.
Tematy:: nawigacja
ruch statku
sterowanie
modele matematyczne
navigation
ship motion
steering
mathematical model; Pokaż więcej
Wydawca:: Polskie Forum Nawigacyjne
Powiązania:: https://bibliotekanauki.pl/articles/320952.pdf Link otwiera się w nowym oknie
Opis:: In this paper there is undertaken an attempt to present the formal description of the ship’s navigation process. This formal description takes into account not only all the most important ship’s characteristics that influence the ship’s motion but also all the most important environmental characteristics influencing the ship’s behaviour at sea. The formal description comprises the following issues: ship’s navigation process, navigational information, dynamic of the ship’s motion, equations describing the ship’s navigation process, and mathematical models of ship’s navigation process.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Two-dimensional coordinate estimation for missing automatic identification system (AIS) signals based on the discrete Kalman filter algorithm and universal transverse mercator (UTM) projection
Autorzy:: Jaskólski, K.
Tematy:: AIS
Kalman filter
AIS data estimation
data fusion
ship movement prediction
ship motion tracking; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135285.pdf Link otwiera się w nowym oknie
Opis:: Due to safety reasons, the movement of a ship in coastal areas should be monitored, tracked, recorded, and stored. The Automatic Identification System (AIS) is a suitable tool to use in performing these functions. The probability limit for the AIS dynamic data availability can be limited by the lack of a Global Position System (GPS) signal, heading (HDG), and rate of turn (ROT) data in the position report. The unavailability of a data link is an additional limitation. To fill this gap, it is possible to attach the discrete Kalman filter (KF) for the position and course estimation. Coordinate estimation in the absence of a transmission link can improve the quality of the AIS service at Vessel Traffic Service (VTS) stations. This paper has presented the Kalman filtering algorithm to improve the possibilities for ship motion tracking and monitoring in the TSS (Traffic Separation Scheme) and fairways area. More than 570 iterations were calculated and the results have been presented in figures to familiarize the reader with the operating principle of the Kalman filter algorithm.
Dostawca treści:: Biblioteka Nauki

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