537 円筒型同調液体ダンパーによる風車タワーの制振解析

概要

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Vibration control of a wind turbine tower with three blades by using a cylindrical tuned liquid damper (TLD) is investigated. The system is modeled by the coupled system of the flexible tower with two degrees of freedom and three blades with a single degree of freedom, and these blades are subjected to wind pressure which varies depending on the height from the ground. Firstly, the vibrations of this system are theoretically analyzed by determining the natural frequency diagram and the frequency response. It is found that (a) the static unbalance of the blades causes the resonances at major critical speeds, (b) the parametric terms due to the gravitational force cause unstable vibrations to appear in the blades, and (c) both the wind pressure and the parametric terms cause the vibrations to appear in the tower. Secondly, the performance of the cylindrical TLD is theoretically investigated. It is found that it works effectively because the vibrations of the frequency of both rotational speed and three times frequency of it are simultaneously suppressed by using a single TLD.
一般社団法人日本機械学会の論文
2011-09-05