KSUPRAMAX 모형선의 장파정 불규칙파 중 전진속도 및 선회궤적을 유사 재현하는 규칙파 탐색

• Published in: 大韓造船學會 論文集 Vol. 61; no. 4; pp. 258 - 266
• Main Authors: 김동진(Dong-Jin Kim), 윤근항(Kunhang Yun), 권창섭(Chang-Seop Kwon), 김연규(Yeon-Gyu Kim), 황승현(Seung-Hyun Hwang)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2024
• Subjects: 조선공학; KSUPRAMAX bulk carrier(KSUPRAMAX 벌크선); Trajectory drift(궤적 밀림); Adverse weather condition(황천 조건); Check helm(중립타각); Forward speed(전진 속도); KSUPRAMAX
• ISSN: 1225-1143; 2287-7355
• DOI: 10.3744/SNAK.2024.61.4.258

It is necessary to predict the ship's manoeuvrabilities in waves for its safe operations in adverse weather. At the early design stage, free-running model tests can be performed to estimate the ship's manoeuvring performance in irregular wave conditions. The wave elevations are randomly varied with times in irregular waves, large deviations of the manoeuvring performance indices are likely to occur depending on the start time of steering scenarios. In this study, a KSUPRAMAX model ship's manoeuvres in long-crested irregular waves are reproduced in the equivalent regular waves. The equivalent regular waves are searched from the energy flux relations between long-crested irregular and regular waves. But there are differences of forward speeds in the model tests, regular wave height and period are modified so that both the forward speed and the trajectory drift in regular waves are similar to those in irregular waves. In addition, low speed course-keeping tests are performed with various wave incident angles in irregular and regular waves. It is confirmed that check helms, drift angles, and speeds as well as trajectories in irregular waves are similar to those in equivalent regular waves.