Dynamic Reliability Analysis of Offshore Wind Turbine Systems Considering Rotational Effect

Abstract eng:
With the increase of the size, it becomes harder to achieve tradeoffs between the economical efficiency and the reliability of offshore wind turbine systems. In the present paper, the Kane's equation based integrated tower-hub-blade model is firstly studied and verified by a shaking table test. By Kane's equation, the equation of motion of the element taking into account the rotational effect takes the form M^eü^' + C^eů^' + K^eu^' = f^e where the matrices M^e,C^e and K^e are different from those when the blades are at rest. Correction terms related to the angular velocity matrix Ω are imposed. Combined with the finite elements of the tower, an integrated model could be established. Figure 1 shows the comparison between the numerical results and the shaking table test. Incorporating the integrated model into the probability density evolution method (PDEM) (Li & Chen, 2009) could implement reliability evaluation of the offshore wind turbine systems under strong wind (Li et al, 2012). Figure 2 shows the PDF surface of the instantaneous response of the hub displacement. Shown in Figure 3 is the PDF of the extreme value of the hub displacement. An integral then gives the first-passage reliability, 99.18%.

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