Session: 06-04-02 Marine Engineering and Technology - II

Submission Number: 180259

A Study on Scenario-Based Collision Avoidance Strategies for Multi-Ship Encounters in Coastal Waters 

Recently, increasing attention has been directed toward the development of Maritime Autonomous Surface Ships (MASS) as a key component of future intelligent maritime transportation systems. Unlike open-sea navigation, coastal waters such as Traffic Separation Schemes (TSS) feature narrow passages and numerous obstacles making it challenging to determine avoidance priorities among multiple vessels. While conventional rule-based or mathematical logic algorithms have been widely applied, they may face difficulties in reflecting realistic decision-making, as they often focus on individual obstacle avoidance rather than the overall traffic flow. Therefore, this study aims to develop a collision avoidance algorithm applicable to complex multi-obstacle situations in coastal waters. To achieve this, a systematic, zone-based framework was first established to recognize and classify various multi-ship encounter relationships that commonly occur in confined waterways. Based on the identified encounter types, a passive mode was developed to provide proactive avoidance guidance that mitigates potential collision risks in advance. Furthermore, for close-range encounters where imminent collision threats arise, an active mode incorporating variable ship speed control was proposed to enable prompt and effective maneuvering. The overall algorithm was evaluated through numerical simulations under representative coastal traffic scenarios in TSS, and its performance was compared with the conventional Velocity Obstacle (VO) algorithm to demonstrate its enhanced effectiveness and practical applicability in realistic multi-ship conditions.

Presenting Author: Dong-Hee Choi Seoul National University

Presenting Author Biography: PhD - 2023.03 ~ Present Seoul National University, Korea (Naval Arch. & Ocean Eng.)
BSc - 2019.01 Korea Maritime and Ocean University, Korea (Navigation Science & Ship Operation)

Research Areas: Ship Manoeuvring, Collision Avoidance, Floating Offshore Wind Turbine(FOWT), Floating Infra Structure

Authors:

Dong-Hee Choi Seoul National University
Hee Geun Lee Seoul National University
Hu-Jae Choi Avikus Co. Ltd
Kwang-Sung Ko Avikus Co. Ltd
Bo Woo Nam Seoul National University