A TIME-DOMAIN METHOD TO PREDICT SHIP MOTIONS IN OBLIQUE SEAS AT FORWARD SPEEDS

• Published in: 水动力学研究与进展：英文版 no. 4; pp. 60 - 70
• Format: Journal Article
• Language: English
• Published: 1997
• Subjects: motion; ship; Time-Domain
• ISSN: 1001-6058

Time-domain analysis is used to predict wave loading and motion responses for a ship travelling at a constant speed in regular oblique waves.The combined diffraction and radiation perturbations,caused by the steady forward speed of the ship and her motions,are considered as a distribution of normal velocities on the wetted hull surface.The ship-hull boundary condition is exactly fulfilled by expressing the fluid normal velocities as a finite series in terms of the body geometry and the incident wave potential.As far as the authors are aware,no similar work is published todate. The new theory is applied to predict forces and motions at forward speed for a Wigley ship-hull in head waves and a catamaran-ferry in oblique waves.Predictions are compared with published theoretical and experimental results for the Wigley ship-hull,and the comparison is good.For the catamaran,a self-propelled model is built and tested in the large towing tank and seakeeping basin of the China Ship Scientific Research Centre,Wuxi