Exploitable results
To minimise the likelihood of structural failure of wind turbines they are being designed in accordance with deterministic design rules. These may, however, be inadequate for the new, larger, more powerful turbines. The new reliability analysis methodology for larger turbines produced during this project provides a useful tool for turbine engineers allowing improvements in the safety, reliability and availability of machines.
In 1992 the project "Probabilistic Safety Assessment of Wind Turbines" demonstrated the applicability of methods for probabilistic safety analysis (failure mode and effect analysis, event tree and fault tree analysis) for wind turbine engineering, not only for safety purposes, but also for a systematic analysis of reliability and maintainability. As wind turbines increase in size and power, however, these rules may not be adequate to ascertain a safe and well balanced design. Based on the results of the previous project, the present study was undertaken to verify, demonstrate and further improve this methodology for reliability analysis. It was also intended to assess the applicability and benefit a methodology to the specific demands of the design, development and operation of large wind turbines. To achieve these objectives the NEWECS-45 machine was selected as a case study turbine as this turbine design has been in operation since 1985, therefore significant operating experience is available.
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