Abstract
In the paper, the simple estimation method of the time domin slow drift motion of a moored semi-submersible platform in directional spectrum waves is presented. This method is obtained expanding the Hsu's method to short crested irregular waves (directional spectrum waves). Based on this method, if we can obtain the time record of the short crested surface wave slope, at the position of the platform, by calculation or experiment, the low frequency drift force can be estimated practically only using the regular wave drift force coefficients.The time domin estimations of the sway drift motion are compared with the model experiment in directional spectrum waves and they showed good agreement each other.
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