A Data Replenishment Method for Self Regulating Sail-Assisted Ships Considering Big Data
The concept of intelligent sail-assisted ships based on big data comes to people's mind gradually. Data loss and distortion cannot be avoided during data collecting and preprocessing process. In this paper, a data replenishment method based on computational fluid dynamics (CFD) method is proposed and simulation cases are done to explain the method
Fundamental research for development of an advanced sail-assisted ship
A new hybrid sail that consists of a slat, a hard sail and a soft sail is designed for advanced sail-assisted bulk carriers. The new hybrid sail is assumed to utilize deck crane as its boom for practical application. Wind tunnel test for measuring aerodynamic characteristics has clarified that the hybrid sail has maximum thrust coefficient, 2.46. Interaction effect among plural hybrid sails and between hull and sails is also investigated experimentally. Although interaction effect that deteriorates sail performance is observed it is clarified experimentally that graduated arrangement of sails angle is effective for minimizing the undesirable interaction effect. Weather routing system for advanced sail-assisted ships is developed. The system searches for minimum fuel consumption route using a nonlinear programming method in which arrival time is constrained. Weather routing calculation using actual wind, waves and ocean current data in North Pacific Ocean has indicated that the advanced sail-assisted bulk carrier being equipped with the newly developed hybrid sails and utilizing the newly developed weather routing system can cut emission of carbon dioxide or fuel consumption by 17.4 percent totally compared to a conventional bulk carrier on Great Circle route.
Prediction of Resistance and Propulsion of a Ship in a Seaway
A procedure for calculating added resi- stance, transverse drift force and mean yaw. moment on a ship in regular waves of any wave direction is presented. An asymptotic formula for small wave lengths has also been derived. The influence of wave induced motions on the wake, open water propeller characteristics, thrust deduction and relative rotative efficiency is discussed. The reason to false values for the propulsion factors are pointed out. Determination of RPM and HP in irregular waves is discussed.