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.
PROSPECT OF SAIL-EQUIPPED MOTORSHIP AS ASSESSED FROM EXPERIMENTAL SHIP "DAIOH"
This article suggests an approach to the realization of a sail-equipped motorship based on the results obtained from wind tunnel tests, on-shore tests and sea trials of the experimental-ship "Daioh" conducted by the joint efforts of Nippon Kokan K.K. and the Japan Marine Machinery Development Association. Much technical data on sail performances was obtained through systematic wind tunnel tests. The sailing equipment was first mechanized to meet the various requirements, installed on board "Daioh", and tested, and a power gain estimation method was verified by the sea trials. The economical aspects off a 10,000 to 35,000 DWT Bulk Carrier were also studied by utilizing the power gain estimation method. This then is a report on the successful termination of the first stage in the development process.