Abstract
A participation factor formulation is developed to determine the importance of each natural frequency due to rotor blades induced forces and moments. This factor can be used to realize the quantitative influence of a mode due to rotor-induced responses and know which active degree of freedom of that mode at the tower top. For jacket support structures, the participation factor of the first torsional mode is often large, so the multiple of the 3P frequency (nF3p) approaching the first torsional mode will cause serious resonance conditions. Thus, appropriate small yaw stiffness and large yaw damping are suggested to avoid resonance and reduce high-frequency fatigue damage. The participation factors of the second and third bending rotational natural frequencies often between 10% and 30% are not concentrated compared to the first torsional natural frequency. The resonance of this mode with nF3p may not be severe for fatigue issues, but it is still necessary to avoid it. The tuned mass damping can be used to reduce the rotor-induced forces and moments, while the proposed participation factor is useful to know which mode and location should be first reduced.
Published Version
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