Jepsen, Michael S.7; Damkilde, Lars1; Hansen, Niels A.8; Aarup, Bendt9
Peter Frigaard, Jens Peter Kofoed, AbuBakr S. Bahaj, Lars Bergdahl, Alain Clément, Daniel Conley, Antonio F. O. Falcão, Cameron MacLeod Johnstone, Lucia Margheritini, Ian Masters, António José Sarmento, Diego Vicinanza
1 The Faculty of Engineering and Science, Aalborg University, VBN2 Department of Civil Engineering, The Faculty of Engineering and Science, Aalborg University, VBN3 Division for Structures, Materials and Geotechnics, The Faculty of Engineering and Science, Aalborg University, VBN4 Advanced Structural Engineering, The Faculty of Engineering and Science, Aalborg University, VBN5 Esbjerg afdelingen, The Faculty of Engineering and Science, Aalborg University, VBN6 Danish Centre for Risk and Safety Management, The Faculty of Engineering and Science, Aalborg University, VBN7 Aalborg University, VBN8 Wavestar Energy A/S, Park Allé 350A, 2605 Brøndby, Denmark9 Hi-Con A/S, Hjallerup Erhvervspark 1,9320 Hjallerup, Denmark
Lowering the overall cost of wave energy converters is a necessity for creating a feasible solution to renewable energy. The design of wave energy converters is in general based on traditional steel design methods. In the design of steel structures subjected to significant dynamical loading and a harsh environment issues such fatigue resistance and durability are of major concern. The welded joints in steel structures significantly reduce the fatigue resistance and give a low utilization ratio of the steel material. Furthermore is coating of all exposed steel surfaces a necessity to secure a sufficient durability of the entire structure. Consequently it will be of great concern to optimize the structural concepts of the wave energy converters and secondly find materials tailored to the harsh environment at sea. The paper shows that utilizing Ultra High Performance Fibre Reinforced Concrete as primary material in the design of wave energy converters is a feasible and promising solution, which reduce the overall cost of the structure significantly. This will be illustrated by means of a feasibility study carried out on the Wavestar project, where special attention is pointed at the arm and float structure . The arm structure is previously designed as a steel structure, whereas the float has been designed as a light weight glass fibre structure. The new UHPFRC design gives a very beneficial solution that will contribute to the reduction of the manufacturing and the maintenance cost of the Wavestar wave energy converter.
10th Ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference, 2013