抄録
IMO adopted a revision of MARPOL Annex VI to establish the Energy Efficiency Design Index (EEDI) for new build ships in July 2011. The target EEDI will be tightened incrementally until 2025. The ship hull roughness is one of the most important factors that affect ship resistance and efficiency. In this study, friction measurements of cylinders painted with antifouling paint were conducted using double rotating cylinder equipment. Some antifouling paints showed lower Rz and higher RSm values, thus resulting in lower Friction Increasing Ratios (FIR) of currently available antifouling paints. Actual ship hull surface roughness is measured using a roughness analyzer that can measure only Rz at a standard length of 50mm. However, the Rz value alone does not provide enough information to predict friction. Therefore, the replicate method was developed in order to analyze the hull roughness parameters. Roughness analysis using both roughness amplitude and wave length parameters is shown to be very useful for predicting more accurately the ships’ friction resistance.
