Publications

Xu, S. and Guedes Soares, C. (2020), “Experimental investigation on a point absorber moored by taut mooring system and mooring fatigue analysis”, Proceedings of the ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2020), 28 June - 3 July, Fort Lauderdale, Florida, USA, paper: OMAE2020-18819.

In this paper, a taut wire mooring system has been designed consisting of three wire ropes symmetrically arranged. The power take-off system is modelled by a liner spring and a heave plate to simulate the linear damping of the power take-off. Free decay tests were carried out to obtain the system heave, pitch and surge natural periods. A series of regular wave tests in head sea were performed to study the dynamics of system. Irregular wave tests were then conducted to simulate the system performance in the operational sea states, where the irregular waves were modelled by the Jonswap spectrum. The WEC motion responses and mooring tensions are studied. The short term mooring fatigue damage estimated by different spectral methods are compared to the rainflow counting method. The spectral method for estimating fatigue damage including Dirlik formula, Jiao-Moan method and Tovo-Benasciutti approach. The accuracy of spectral methods for predicting mooring fatigue damage are discussed.

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