GTHTR300磁気軸受支持ターボマシンの振動解析,1

Vibrational analysis of magnetic bearing support turbo machine for GTHTR300, 1

黒河内 直浩; 高田 昌二; 稲垣 嘉之

Kurokochi, Naohiro; Takada, Shoji; Inagaki, Yoshiyuki

本報では、GTHTR300用ガスタービン発電機を支持する磁気軸受の制御系の設計で使用する回転軸の近似モデル構築に必要な基礎データを取得するため、3次元有限要素解析により、GTHTR300発電機回転軸の振動特性を模擬した1/3スケールモデル磁気軸受開発試験装置による試験データをもとに、回転軸の固有振動数の軸受剛性依存性,軸方向振幅分布,高周波固有振動数を予測する解析モデルの検証を行い、その妥当性を明らかにした。この結果をもとにGTHTR300用ガスタービン発電機回転軸について、固有振動数及び軸方向の振動特性を予測できた。本数値解析結果は、磁気軸受の制御系の設計に必要不可欠である回転軸の近似モデルである「はりモデル」の構築に反映させる計画である。

In order to acquire the fundamental data which is necessary for the approximation model construction of rotor which is used in the design of control system of the magnetic bearing which supports the gas turbine generator for GTHTR300, this paper shows 3 dimensional finite element analysis, the bearing rigid dependency of rotor eigen value was made clear, and axial direction amplitude distribution was made clear. In addition, it made also the higher-order bending vibration eigen value of each bearing rigidity clear. With the comparison and the examination of this numerical analysis result and the test result, it could verify propriety. This numerical analysis model was applied to GTHTR300, rotor eigen value and axial direction amplitude distribution was estimated. It is the plan that this numerical analysis result is made to reflect on the construction of the beam model that is the approximate model of rotor which is for the design of control system of the magnetic bearing indispensable.