摘要：For the estimation of ship speed in actual seas, it is important to calculate external forces acted on a ship hull with accuracy. In National Maritime Research Institute, a calculation method for ship speed in actual seas on a constant engine output has been developed and validated by onboard measurements with the cooperation of the Ministry of Land, Infrastructure, Transport and Tourism, Japan, the Ministry of Environment, Japan and the relevant shipping and ship building companies. The results of onboard measurements for the pure car carriers, the tanker, and the bulk carrier have been reported.In this paper, the results of onboard measurements for the container ship of about 280 meter long are reported in terms of the verification of the calculation method of ship speed in actual seas. Moreover the influence of container load condition related to ship performance in actual seas is studied by the calculation and the onboard measurement.
