By Royal Institution of Naval Architects
Read or Download Marine renewable and offshore wind energy : 21 - 23 April 2010, [London, UK ; papers] PDF
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Additional info for Marine renewable and offshore wind energy : 21 - 23 April 2010, [London, UK ; papers]
Sample text
X Model-based assessments require a system model that has to be established, specifying random variables and system characteristics in order to derive performance measures. They can be further classified into simulation and analytical methodologies. g. Monte Carlo) to model the dynamic system behaviour with randomly generated discrete state events. Analytical methods describe the system through several sets of equations and are either of the state space or the non-state space type. The state space describes the set of combinatory system states.
6 Given the complexity of MEC systems and the limited resources available it is important to target the test regarding two categories. 2 0 50 0 1,0 0 1,5 0 00 2,0 0 2,5 0 00 3,0 0 3,5 0 00 4,0 0 4,5 0 00 5,0 0 5,5 0 00 6,0 0 6,5 0 00 7,0 0 7,5 0 00 8,0 0 8,5 0 00 0 Time [h] Figure 4: System reliability of a notional WEC and the effect of ±40% variability of the structural failure rate. Large reliability prediction uncertainties have a direct effect on costs as higher design safety factors are needed.
CONCLUSIONS In the pre-commercial phases of development of an OEC concept, OEC devices will typically be installed in single installations, or in small installations (pairs of devices) rather than in large arrays of devices. As such, any fixed costs associated with the design and deployment of foundation and mooring systems must be amortised over only a small number of units. This necessitates adopting mooring and foundation solutions that reduce fixed costs associated with items such as extensive geotechnical surveys or use of specialist equipment, even where this may result in higher materials costs through the use of larger, less efficient foundations structures.