軸直径変化部を有するロータの曲げ振動モードに関する振動計算の高精度簡易モデルの提案(機械力学,計測,自動制御)

概要

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The design of Gas Turbine High Temperature gas cooled Reactor with a power output of 300MWe employed magnetic bearings for supporting gas turbine rotor composed of turbo-compressor and generator rotors, which are connected by a flexible coupling each other. The generator rotor is a flexible rotor, which passes over the forth critical speed below the rated speed. The total length, bearing span, mass and rated speed of the rotor is 18m, 8.19m, 67t and 3600rpm, respectively. For designing a controll system of magnetic bearing, a simplified rotordynamics model was proposed based on Timoschenko beam model by adding a rotational spring which simulated deformation of plane at stepped parts of rotor. The model predicted adequately the bearing stiffness dependency on vibration mode shapes of rotor at critical speeds in comparison with numerical results by 3-dimensional FEM analysis. As opposed to the conventional model, the model predicted adequately the increase of inclination at the center of rotor where mass was concentrated because bending stiffness was lowered by the deformation of plane at stepped parts of rotor, which affects whirling motion by Jayro effect at the forth critical speed.
一般社団法人日本機械学会の論文
2009-04-25