A master thesis from Aalborg University
Reliability and Risk Analysis of Wind Turbines
[Pålideligheds- og risikoanalyse af vindmøller]
Author(s)
Term
4. term
Education
Publication year
2012
Submitted on
2012-06-08
Pages
81 pages
Abstract
Usikkerhederne ved design for udmattelse ifølge Eurocode undersøges for en vindmølle samling. Baggrundsmaterialet bestående af udmattelses forsøg der ligger til grund for normen analyseres, og betydningen af spredning i resultater vurderes. En ikke-linear SN-kurve er undersøgt, og pålideligheden opnået ved et design med denne findes. En lastserie bestående af cykler med lav frekvens er estimeret, og dens betydning for pålideligheden er fundet.
The project group will through this report investigate the uncertainties regarding fatigue design of a wind turbine jolt. The test series forming the background of \citep{EC-1993-1-9} are analysed, and the significance of the scatter included is evaluated. A nonlinear SN-curve is implemented due to the uncertainties regarding the location of the knee point of bilinear SN-curves. Estimates of a Low Cycle Fatigue load is proposed, and the resulting accumulated reliability is analysed by a probabilistic approach. This is done in order to quantify the possible trimming of design parameters, when designing for Fatigue loads
Keywords
Documents
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