Abstract

Model tests have been performed in regular waves to measure second-order sum-frequency wave. excitations, and resultant motions and tether forces of a tension-leg platform (TLP). These test results are used to validate the predictions based on a recently developed second-order diffraction theory for general three-dimensional bodies. It is found that the vertical-plane motions and result- ing tether forces of the TLP include second-order sum-frequency resonant components which are comparable in magnitude with first-order wave-frequency responses. The correlation between predicted and measured results is satisfactory, confirming the validity of the theoretical predictions.

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