IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Probabilistic analysis of blade fatigue in exposed tidal sites
Probabilistic analysis of blade fatigue in exposed tidal sites
Author : ANDREW CLARKE(1), JIMMY MURPHY(2)
ABSTRACT
Horizontal axis tidal turbines, when in operation at exposed sites, are subject to cyclical loading as a result of the vertical
velocity profile and particle velocity from wave orbitals. At these sites the effects of waves in particular can have a
significant effect on increasing the number of fatigue loading cycles for a turbine blade which in turn reduces the blade’s
operational lifetime. This paper outlines the effects of wave conditions and current speed through the use of probabilistic
and computational methods. The analysis involves computing the occurrence of wave conditions and current speed,
determining applicable loading conditions and the likelihood of those conditions occurring. These loading conditions are
simulated and a rainflow analysis is performed on each loading cycle. The contribution of these cycles to the cumulative
fatigue damage can then be calculated and applied to a fatigue loading cycle curve. These analyses are used to
determine the influence of environmental conditions on blade loadings and the effects an exposed site can have on the
blades operational lifetime. A comparison is performed between the predicted lifetime of the turbine blades under the
same current conditions both with and without the influence of wave conditions.
File Size : 196,266 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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