KSUPRAMAX 모형선의 장파정 불규칙파 중 전진속도 및 선회궤적을 유사 재현하는 규칙파 탐색
Forward Speeds and Turning Trajectories of a KSUPRAMAX Model Ship in Long-Crested Irregular and Equivalent Regular Waves
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초록
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.
Abstract
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.
참고문헌 (24)
- Hirano, M., "Ship turning trajectory in regular waves", Transactions of the West-Japan Society of Naval Architects, 60, pp.17~31 (1980)
- Hirayama, T., "Manoeuvrability of a full ship in directional spectrum waves of short wave length", Journal of the Society of Naval Architects of Japan, 176, pp.129~136 (1994)
- IMO, "Guidelines for determining minimum propulsion power to maintain the manoeuvrability of ships in adverse conditions. MEPC.1", Circ.850, pp.2021, ~
- The Specialist Committee on Waves – Final Report and Recommendations to the 23rd ITTC, "ITTC", ~ (2003)
- The Specialist Committee on Manoeuvring in Waves – Final Report and Recommendations to the 29th ITTC, "ITTC", ~ (2021)
- ITTC, "Wave Energy Converter Model Test Experiments. Recommended Procedures and Guidelines, 7.5-02-07-03.7", ~ (2021)
- Kim, K. H., "Numerical analysis of added resistance on ships by a time-domain rankine panel method", Journal of the Society of Naval Architects of Korea, 47(3), pp.398~409 (2010)
- Kim, D. J., "Experimental investigation on turning characteristics of KVLCC2 tanker in regular waves", Ocean Engineering, 175, pp.197~206 (2019)
- Kim, D. J., "Initial and steady turning characteristics of KCS in regular waves", Applied Ocean Research, 105, pp.102421~ (2020)
- Kim, D. J., "Experimental study on turning characteristics of KVLCC2tanker in long-crested irregular waves", Ocean Engineering, 244, pp.110362~ (2022)
- Park, D. M., "A study on relative wave elevation measurement of KSUPRAMAX-O in regular waves", Journal of the Society of Naval Architects of Korea, 60(5), pp.305~319 (2023)
- Rabliås, Ø., "A rational model for maneuvering in irregular waves with the effect of waves on the propeller and rudder inflow taken into account", Ocean Engineering, 243, pp.110186~ (2022)
- Sanada, Y., "Trajectories for ONR tumblehome maneuvering in calm water and waves", Ocean Engineering, 72, pp.45~65 (2013)
- Sanada, Y., "ONR Tumblehome course keeping and maneuvering in calm water and waves", Journal of Marine Science and Technology, 24(3), pp.948~967 (2018)
- Shigunov, V., "International benchmark study on numerical simulation methods for prediction of manoeuvrability of ships in waves", Ocean Engineering, 165, pp.365~385 (2018)
- "Final report of SIMMAN2020 workshop –Volume III: Analysis of trajectory submissions" (2023)[URL]
- Sprenger, F., "Experimental studies on seakeeping and maneuverability of ships in adverse weather conditions", Journal of Ship Research, 61(3), pp.131~152 (2017)
- Suzuki, R., "Estimation of full-scale ship manoeuvrability in adverse weather using free-running model test", Ocean Engineering, 213, pp.107562~ (2020)
- Suzuki, R., "Effects of steady wave forces on course-keeping manoeuvres of fulland model-scale ships moving obliquely in short waves", Ship Technology Research, 70(3), pp.190~208 (2023)
- Ueno, M., "Experimental study on manoeuvring motion of a ship in waves", Proceedings of International Conference on Marine Simulation and Ship Manoeuvrability (2003)
- Yasukawa, H., "Simulation of ship maneuvering in waves(1st report : turning motion)", Journal of the Society of Naval Architects and Ocean Engineers, 4, pp.127~136 (2006)
- Yasukawa, H., "Simulation of ship maneuvering in waves(2nd report : zig-zag and stopping maneuvers)", Journal of the Society of Naval Architects and Ocean Engineers, 7, pp.163~170 (2008)
- Yasukawa, H., "Maneuvering simulation of a KVLCC2tanker in irregular waves", Proceedings of International Conference on Marine Simulation and Ship Manoeuvrability (2015)
- Yun, K., "Experimental study on manoeuvrability of KVLCC2 in shallow water by free running model test", Proceedings of International Conference on Marine Simulation and Ship Manoeuvrability (2015)