Mathematical model of single-propeller twin-rudder ship

A mathematical model of a single-propeller twin-rudder ship has been developed from captive and free running model experiments. An open water rudder experiment was carried out to figure out the characteristics of the rudder. Captive experiments in a towing tank were carried out to figure out the performance of a single-propeller twin-rudder system on a large vessel. Interactions between the hull, propeller and twin rudders, including mutual interactions between the twin rudders, were expressed with several coefficients that were calculated from the experimental results at various ship speeds. In the analysis, the unique characteristics of a single-propeller twin-rudder ship, which affects rudder forces, were explained and formulated in the mathematical model. The captive model tests were conducted with zero ship’s yaw rate, so the interaction coefficients, which are influenced by the yaw rate, are determined from free running model experiments. Validation of the mathematical model of a single-propeller twin-rudder system for a blunt body ship is carried out with an independent set of free running experiments, which were not used for determining the interaction coefficients. The validated numerical model is used for carrying out simulations. Based on simulation results, some recommendations have been proposed for installing a single-propeller twin-rudder system.

[1]  Masami Hamamoto,et al.  Maneuvering Performance of a Ship with VecTwin Rudder System , 1997 .

[2]  Donghoon Kang,et al.  Study on the maneuverability of a large vessel installed with a mariner type Super VecTwin rudder , 2006 .

[3]  J. Holtrop,et al.  A statistical re-analysis of resistance and propulsion data , 1984 .

[4]  Donghoon Kang,et al.  Prediction method of hydrodynamic forces acting on the hull of a blunt-body ship in the even keel condition , 2007 .

[5]  Seung Keon Lee,et al.  Assessment of a mathematical model for the manoeuvring motion of a twin-propeller twin-rudder ship , 2003 .

[6]  V. C. Patel,et al.  Mean-Flow Measurements in the Boundary Layer and Wake of a Series 60 CB = .6 Model Ship With and Without Propeller , 1989, Day 3 Thu, August 10, 1989.

[7]  Toichi Fukasawa,et al.  MANOEUVRING MATHEMATICAL MODEL FOR A TWIN-PROPELLER TWIN-RUDDER SHIP , 1988 .

[8]  姜 東勲.  Maneuvering Mathematical Model of Blunt-body Ship Installed with Mariner Type VecTwin Rudder , 2007 .

[9]  Masayoshi Hirano.  ON CALCULATION METHOD OF SHIP MANEUVERING MOTION AT INITIAL DESIGN PHASE , 1980 .

[10]  Marc Vantorre,et al.  Proceedings of the 21st International Towing Tank Conference, ITTC'96: Report of the Manoeuvrability Committee , 1996 .

[11]  Hiroaki Kobayashi,et al.  A Study on Mathematical Model for the Maneuvering Motions of Twin-propeller Twin-rudder Ship : In Reference to the Maneuvering Motion from Ordinary Speed Range to Low Speed Range , 1994 .