10 Mode at Sea Project

　CO2 emitted from ships is a cause of global warming, and is currently said to account for about 3% of the world's anthropogenic CO2 emissions. However, it is thought that CO2 emissions from ships will increase rapidly due to the dramatic growth in maritime transport volume associated with the development of the global economy.

　In order to reduce the increasing CO2 emissions, an index to evaluate the performance of ships in actual seas, “10 Mode Index at Sea” has been developed.

　The “10 Mode Index at Sea” indicates the performance of a ship in actual sea conditions. A ship's performance in the presence of waves and winds differs from its performance without waves and winds. Since waves and winds are present in the actual seas where ships operate, it is important to know how a ship performs in these conditions. The 10 Mode Index at Sea indicates a ship's performance in actual seas where it operates.

　The “10 Mode Index at Sea” specifically indicates the decrease of ship speed in waves and winds. Since the decrease of ship speed differs depending on the actual sea performance of each ship, it is an indicator that shows the actual sea performance of the ship.

　Click here for examples of "10 Mode at Sea" and wave and wind conditions (10 modes) to calculate the "10 Mode at Sea."
→   "10 Mode at Sea"

■　How to calculate "10 Mode at Sea"　■

　In order to accurately estimate the decrease of ship speed in actual seas, it is necessary to accurately calculate the resistance caused by the winds and the resistance caused by the waves. The 10 Mode Center at Sea has developed a calculation method (the Sea Performance Evaluation Program (SPICA)) that can accurately calculate these factors. This calculation method is a hybrid calculation method that combines theoretical calculations and simple tank tests to provide high accuracy at a low cost.

　Please click here for more information on the Hybrid Calculation Method.
→   Hybrid Calculation Method

　Furthermore, the accuracy of the calculation method for the 10 Mode Index at Sea is verified through analysis of actual ship measurement data collected since FY2008.

　For details on actual ship measurements, click here.
→   Actual Ship Measurements