Full six degrees of freedom coupled dynamic simulation of ship collision and grounding accidents |
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| Institution: | 1. Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;1. School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian, China;2. Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway;3. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Norway;4. Centre for Sustainable Arctic Marine and Coastal Technology (SAMCoT), NTNU, Norway;1. School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian, China;2. Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway;1. Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden;2. Department of Marine Technology/Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology, Trondheim, Norway;3. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal;4. Department of Ship Building and Marine Engineering, University of Ulsan, Ulsan, Republic of Korea;5. Institute for Ship Structural Design and Analysis, Hamburg University of Technology, Hamburg, Germany;6. School of Engineering, Newcastle University, Newcastle upon Tyne, UK;7. Department of Mechanical Engineering, Aalto University, Espoo, Finland;8. School of Transportation, Wuhan University of Technology, Wuhan, China;9. Marine Structures Division, School of Naval Architecture and Marine Engineering, National Technical University of Athens, Athens, Greece;10. Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, Gdansk, Poland;11. Department of Naval Engineering and Marine Technology, University of Zagreb, Zagreb, Croatia;12. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John''s, Newfoundland, Canada;13. School of Engineering, Department of Civil Engineering and Architecture, Tallinn University of Technology, Tallinn, Estonia;14. Global Technology Centre, Lloyd''s Register EMEA, Southampton, United Kingdom;15. National Institute of Maritime, Port and Aviation Technology, Tokyo, Japan |
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| Abstract: | By taking advantage of the user-defined load subroutine (loadud) and the user common subroutine (usercomm) in LS-DYNA, the authors proposed a new coupled approach for simultaneously calculating structural damage and the planar 3DOF ship motions in ship collisions. The coupled procedure aimed at predicting the detailed structural damage together with reasonable global ship motions. This paper extends the method to consider the full 6DOF ship motions; thus, ship collision as well as grounding accidents can be properly handled. This method is particularly useful for design purposes because the detailed ship hull profile is not needed.A traditional ship maneuvering model is used for the in-plane surge, sway and yaw degrees of freedom with a series of nondimensional coefficients determined from experiments. It is assumed that the out-of-plane degrees of freedom are not coupled with the in-plane ship motions, and there is no coupling among roll, pitch and heave motions. The implementation is verified through free decay tests, and the obtained natural periods show good agreement with theoretical results.Several collision and grounding cases are simulated in which a supply vessel crashes into rigid plates with different orientations. The effects of the roll motion, the heave and pitch motions and the full 6DOF motions are studied. The results are compared with those from a 6DOF decoupled method. Ship motions through the proposed method compare reasonably well with SIMO results. It is found that several consecutive impacts may occur in the simulation of one collision case due to the periodic motions. This is not taken into account in the decoupled method, which makes this method unconservative. |
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| Keywords: | Ship collision and grounding The hybrid method Ship motions 6DOF Coupled simulation |
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