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Publications
Xu, S., Wang, S. and Guedes Soares, C. (2021), “Experimental investigation on the influence of hybrid mooring system configuration and mooring material on the hydrodynamic performance of a point absorber”, Ocean Engineering, Vol. 233, 109178 (20 pages)
The performance of the three hybrid mooring systems was studied by conducting 1:40 model tests of a moored point absorber subjected to regular and irregular waves. The compact hybrid mooring adopts two segments design, i.e., a top synthetic fibre rope (polyester or nylon) and a bottom chain. A submerged buoy is installed on the joint between these two segments. Another design which installs two clumped weights at the end part of chain in the nylon mooring system is also investigated. Seventeen regular and three irregular wave tests were conducted. Heave and pitch resonance wave conditions were tested to study the system dynamics in resonance modes. Results show that the nylon rope is a favourable material for mooring ropes of WECs in terms of energy conversion efficiency. Compared with nylon rope, polyester restricts WEC heave motion responses effectively, and reduces energy conversion efficiency of the WEC studied in this work. The compact compliant mooring system design that consists of nylon rope, buoy, chain, and clumped weights is the best mooring concept for the specified WEC in this work. It demonstrates that when pretension is not large enough during the tests, the mooring will experience slack configuration during the random waves.
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