擬規準座標変換法による回転軸と基礎架台の連成振動解析(第1報,複素固有値解析)(機械力学,計測,自動制御)

抄録

For estimating the vibration of rotating shafts like turbine-generator sets, the rotor vibration analysis must include the vibration characteristics of the foundation. In this paper we propose a method of analyzing the vibration of a coupled rotor-foundation system. This is a quasi-modal technique based on the same concept as the well-known modal synthesis method. It provides a reduced model of an actual system using a combination of eigen modes of an inner system restricted at the bearings plus deflection modes created when inputting the load at the boundary points. A rotor system and a foundation system are each reduced using this quasi-modal technique, and the reduced models are then coupled at the bearing boundary points. Through this procedure, we developed computer code for the vibration analysis of the whole system. This code was applied to a simple model consisting of a rotor and a foundation system using several parameters. The calculated results of this coupled system proved the effectiveness of this code.