Linear vibration analysis of rotating wind-turbine blade

In the wind-turbine design, linear vibration analysis of the wind-turbine blade should be performed to get vibratory characteristics and to avoid structural resonance EOM (equations of motion) for the blade are derived and vibratory characteristics of a rotating blade are observed and discussed in this work Linear vibration analysis requires the linearized EOM with DOF (degree of freedom) For the system with tinge DOF the derivation and linearization of EOM are very tedious and difficult Constrained multi-body technique is employed to derive EOM's to alleviate this burden. It is well known that natural frequencies and corresponding modes vary as rotating velocity changes At the operating condition with relatively high rotating velocity, almost all commercial programs cannot predict the blade frequencies accurately Numerical problems were solved to verify the accuracy of the proposed method Through the numerical problems, this work shows that the proposed method is useful to predict the vibratory behavior of the rotating blade. Furthermore, a numerical problem was solved to check the numerical accuracy of commercial program results within operating region (C) 2009 Elsevier B.V. All rights reserved