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Wyszukujesz frazę "Rak, A." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Reinforcement Learning in Discrete and Continuous Domains Applied to Ship Trajectory Generation
Autorzy:
Rak, A.
Gierusz, W.
Powiązania:
https://bibliotekanauki.pl/articles/259073.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship motion control
trajectory generation
autonomous navigation
reinforcement learning
least-squares policy iteration
Opis:
This paper presents the application of the reinforcement learning algorithms to the task of autonomous determination of the ship trajectory during thein-harbour and harbour approaching manoeuvres. Authors used Markov decision processes formalism to build up the background of algorithm presentation. Two versions of RL algorithms were tested in the simulations: discrete (Q-learning) and continuous form (Least-Squares Policy Iteration). The results show that in both cases ship trajectory can be found. However discrete Q-learning algorithm suffered from many limitations (mainly curse of dimensionality) and practically is not applicable to the examined task. On the other hand, LSPI gave promising results. To be fully operational, proposed solution should be extended by taking into account ship heading and velocity and coupling with advanced multi-variable controller.
Źródło:
Polish Maritime Research; 2012, S 1; 31-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control system for trials on material ship model
Autorzy:
Pomirski, J.
Rak, A.
Gierusz, W.
Powiązania:
https://bibliotekanauki.pl/articles/259075.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship controll Matlab
xPC Target
fast prototyping
hardware-in-the-loop
real-time control
computer simulation
Opis:
The paper presents software environement for fast prototyping and verification of motion control systems for ship. The environement is prepared for isomorphic reduced ship model which is used for training and in research in a area of ship motion control. The control system is build using Matlab-Simulink-xPC package which simplifies and accellerates design and verification of new control algorithms. The systems was prepared also for Hardwarein- the-loop trials when a designed control system is tested inside a virtual environment instead of real actuators, disturbances, communication and measurement devices.
Źródło:
Polish Maritime Research; 2012, S 1; 25-30
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The ship control system for trajectory tracking experiments with physical model of tanker
Autorzy:
Morawski, L.
Vinh, N. C.
Pomirski, J.
Rak, A.
Powiązania:
https://bibliotekanauki.pl/articles/258464.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
nonlinear control
ship control
track-keeping
Opis:
This paper presents a cascade system which stabilizes the transverse deviation of the ship in relation to the set path. The ship’s path is determined as a broken line with specified coordinates of way points. Three controllers are used in the system. The primary controller is the trajectory controller. It generates the set value of heading for the course control system or angular velocity for the turning control system. The course control system is used on the straight line of the set trajectory while the turning controller is used during a change of the set trajectory segment. The characteristics of the nonlinear controllers are selected in such a way that the properties of the control system with the rate of turn controller are modelled by the first-order inertia, while the system with the course keeping controller is modelled by a second-order linear term. The presented control system was tested in Matlab-Simulink environment. The results of tests performed on a lake are presented and discussed.
Źródło:
Polish Maritime Research; 2007, S 2; 49-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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