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Added resistance in irregular waves is generally calculated in frequency-domain as the mean value. However, the mean value would be different from the averaged value in consideration of long-period components. Long-period components of added resistance in irregular waves have been rarely considered since tank tests method in irregular waves have not been established due to the effect by the appended restoring force, and the estimation method has not been verified. In this paper, long-period components are evaluated with Newman's approximation, and the correction for inertia force is employed for tank tests in order to eliminate the effect of appended restoring force. Through tank tests, the analysis method of tank tests data and the estimation method have been confirmed. The effect of long-period components on ship performance in actual seas are examined in a case example of PCC. As a result, it has been found that in consideration with the long-period components, the required power at the same speed might be different about 10% from that with the mean value calculated by the conventional frequency-domain method.
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