摘要：Estimation of ship speed in actual seas is very important to evaluate the comprehensive performance in her life. Estimation of the added resistance in ballast condition is more difficult than that in full load condition due to the complicated phenomena around the bulbous bow. The proposed method, which combines tank tests with calculation, shows the estimation of added resistance in ballast condition accurate for a Panamax bulk carrier.In this paper, the proposed method is applied to a handy-size bulk carrier (approximately 160m length) equipped with cranes in both ballast and full load conditions, and its accuracy is confirmed by model tests and onboard measurements. Moreover the difference of resistance components due to winds and waves is discussed in terms of load condition toward the improvement of evaluation of performance in actual seas for handy-size bulk carriers equipped with cranes.
