直下型地震を受けるスクウィーズ・フィルム・ダンパ〜回転体系の振動シミュレーション : 第2報, 弾性回転軸系, 阪神大地震を受ける場合

概要

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In this report, we developed programs for calculations of time history response in the case of a flexible rotor system that is subjected to base excitation such as earthquake with vertical shock. A finite element method was used in the equations of a flexible rotating shaft. As an analytical model of a SFD, the same one as that in the 1st report was used. A program was also developed for calculating time history responses even if damper journals collide with damper bearings due to vibration caused by a large base excitation. We calculated the natural frequencies and modes of vibration for the rotor system modeled in the dimensions near those of an existing turbine, and investigated the dynamic characteristics of the rotor system. Furthermore, we calculated the time history response in the case of the rotor system that was oscillated by a vertical seismic wave that was observed in Kobe City when the Great Hanshin Earthquake occurred.
1996-12-25