Ship-to-ship Dialogs Using A Finite State Machine
- 30 June 2022
- journal article
- research article
- Published by Galenos Yayinevi in Journal of ETA Maritime Science
- Vol. 10 (2), 124-132
- https://doi.org/10.4274/jems.2022.18853
Abstract
Collision Avoidance Systems require correct and unambiguous application of the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs). Ship-to-ship dialogs, aimed at sharing encounter data to comply with COLREGs and reaching maneuvering agreements, would help to reduce the risk of collision. Finite State Machine (FSM) is a mathematical model for describing the sequential behavior of a control program. Sequential function chart (SFC) based on FSM, is a graphical programming language for Programmable Logic Controllers, defined by the international standard IEC 61131-3. In this work, SFC language is used to model and program the set of states and transitions involved in the ship-to-ship dialogs initiated when one of them detects a risky situation. SFC facilitates the development, verification, and maintenance of the control program. The implemented ship-to-ship communications to share data will help in eliminating differences in decision-making and achieving safer encounters. An example of a risky encounter illustrates this assertion, not contemplated in the related studies consulted. The implemented dialogs will enable sharing information on the encounter characteristics and reaching agreements on the maneuvers to be performed, or maintaining a record about disagreements.Keywords
This publication has 5 references indexed in Scilit:
- Ship-to-ship dialogues and agreements for collision risk reductionJournal of Navigation, 2021
- Specification and Design of Safety Functions for the Prevention of Ship-to-Ship Collisions on the High SeasJournal of Navigation, 2018
- On the history of Discrete Event SystemsAnnual Reviews in Control, 2018
- Applying Model Checking to Industrial-Sized PLC ProgramsIEEE Transactions on Industrial Informatics, 2015
- On the excitation of long nonlinear water waves by a moving pressure distributionJournal of Fluid Mechanics, 1984