Integrated Four Quadrant Propeller Maneuvering Model and Power Systems for Twin-Shaft Ships

Abstract This paper presents an extended maneuvering model for twin-shaft ships that integrates four-quadrant propeller dynamics and power system dynamics to simulate both forward and astern operations, including crash stop and astern maneuvers. Building on the earlier combined maneuvering and seakeeping model for the ONR Tumblehome vessel, this work incorporates detailed propulsion equations to capture ship dynamics across all four quadrants of propeller operation. The study relies on the well documented Wageningen B-series propellers, which provide extensive experimental data for modeling the propeller performance in all four quadrants. Expanding the analysis to include astern and crash stop conditions provides a more thorough understanding of ship performance during emergency and reverse operations. The inclusion of the propeller shaft dynamics captures the interaction between the engine, propeller and hull, promoting a more robust and practical approach. The extension to astern and crash stop conditions allows for a more comprehensive assessment of ship performance in emergency and reverse operations and explores the effect of propeller shaft dynamics to better understand the engine to propeller to hull interactions which make the model more realistic.