For the accurate evaluation of the ship performance in actual seas, the relationship among the ship speed, the engine revolution and the engine power in calm seas is important. One method to obtain the relationship is to use the onboard monitoring data. The approximate curve is obtained by the least-square method. In this method, it is important that the number of the data is enough in the appropriate range of the engine revolution or the ship speed. However in the case of a bulk carrier, the range of the engine revolution and the ship speed is narrow in one voyage. In this paper, a new numerical model is applied to a bulk carrier in service. The data is filtered by the wind speed, the significant wave height, the difference between the ship speed through the water and over ground and the rudder angle. Moreover the corrections for the external force and the combination of the data of each voyage are carried out. The approximate curve is obtained in a numerical expression using parameters “an”, “bn”, “cn” and “dnv”, and the displacement correction model is obtained. The difference between the simulation and the monitoring data of the ship speed and the fuel oil consumption is within 2%.
Application of a Numerical Model on Displacement Correction to the Evaluation of Ship Performance in Calm Seas for a Bulk Carrier Using Ship Monitoring Data
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-06
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Maneuvering characteristics of mariner type ship (USS Compass Island) in calm seas
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