2005 Fiscal Year Final Research Report Summary
Study on a Unified Simulation Method for Both Ship Wave-Induced and Maneuvering Motions
| Project/Area Number |
16360438
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
YASUKAWA Hironori Hiroshima University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (40363022)
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| Co-Investigator(Kenkyū-buntansha) |
KOSE Kuniji Hiroshima University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (40034409)
HIRATA Niritaka Hiroshima University, Graduate School of Engineering, Research Assistant, 大学院工学研究科, 助手 (80181163)
HIGO Yasushi Hiroshima University, Graduate School for International Development and Cooperation, Professor, 大学院国際協力研究科, 教授 (20156582)
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| Project Period (FY) |
2004 – 2005
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| Keywords | ship / wave-induced motion / maneuvering motion / steering / simulations / tank tests / seakeeping / theoretical calculations |
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| Research Abstract |
A practical method for simulating both ship maneuvering and wave-induced motions has been presented in this study.
Separating the basic motion equations into 2 groups where one is for high frequency wave-induced motion problem and the other is for low frequency maneuvering problem, we derived the total 10 motion equations which are composed of 6DOF equations for high frequency problem and 4DOF (surge, sway, roll and yaw) equations for low frequency problem. New Strip Method was used for estimating the hydrodynamic force components such as added mass, wave damping and wave exciting forces for high frequency problem. The present method coincides with the time domain strip method when dealing with a ship straight moving problem. And when the wave height is set to be zero, the method coincides with the maneuvering simulation method in still water, so-called MMG model.
In order to obtain the verification data for the simulation method, free-running model tests with respect to the maneuvering motions such as turning, zig-zag maneuver and stopping motions were carried out in regular and irregular waves using SR108 container ship model. The model tests were conducted at Seakeeping and Maneuvering Basin, Nagasaki R ＆ D Center, Mitsubishi Heavy Industries. The regular wave tests were carried out in various wave lengths in heading and beam waves. As the irregular wave conditions, long and short crested irregular waves are selected corresponding to sea state 4 and 5.
Numerically solving the motion equations derived, the various maneuvering motions in waves for the SR108 ship model were predicted. The predicted results are compared with the free-running model test results. The results roughly agree with the test results. The present simulation method can predict the maneuvering motions in regular and irregular waves with the practical accuracy, although there is some room for improvement in short wave length region such as wave length ratio 0.5.
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Research Products
(8 results)
