435 モーダル定数の実機実測による翼軸連成振動数解析法(連成振動,設計,OS-18 ロータダイナミクス,総合テーマ「伝統を,未来へ!」)

概要

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Recent turbine-generator set with longer blades for higher output and efficiency, torsional coupled umbrella mode of blades system tends to be nearby the double frequency of electricity system. A quasi-modal technique based on the similar concept of modal synthesis method is proposed, but it is a unique method to provide a visual reduced model. An equivalent mass-spring system is produced for uncoupled umbrella mode and modal parameters are measured in one turbine rotor. The parameters are use to estimate the rotor-blade coupled torsional frequencies of a 700MW turbine-generator set and verified the accuracy of the estimation through a field test.
2010-09-14