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Time-domain numerical and segmented ship model experimental analyses of hydroelastic responses of a large container ship in oblique regular waves
Institution:1. College of Naval Architecture and Ocean Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, China;2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, 510641, China;3. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China;8. University of Dubrovnik, Maritime Department, Croatia;1. MARIN Haagsteeg 2, P.O. Box 28, 6700 AA Wageningen, The Netherlands;2. DNV GL Maritime Advisory Services, Brooktorkai 18, 20457 Hamburg, Germany
Abstract:Real sea conditions are characterized by multidirectional sea waves. However, the prediction of hull load responses in oblique waves is a difficult problem due to numeral divergence. This paper focuses on the investigation of numerical and experimental methods of load responses of ultra-large vessels in oblique regular waves. A three dimensional nonlinear hydroelastic method is proposed. In order to numerically solve the divergence problem of time-domain motion equations in oblique waves, a proportional, integral and derivative (PID) autopilot model is applied. A tank model measurement methodology is used to conduct experiments for hydroelastic responses of a large container ship in oblique regular waves. To implement the tests, a segmented ship model and oblique wave testing system are designed and assembled. Then a series of tests corresponding to various wave headings are carried out to investigate the vibrational characteristics of the model. Finally, time-domain numerical simulations of the ship are carried out. The numerical analysis results by the presented method show good agreement with experimental results.
Keywords:Hydroelasticity theory  Segmented model experiment  Oblique wave  PID  Nonlinear wave loads  Slamming
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