转子-轴承系统对具有转动分量的地震激励的瞬态响应

Transient Response of a Rotor-Bearing System to Earthquake Excitation with Rotational Components

采用转子的柔性梁模型建立转子 -轴承系统地震激励下的运动方程 ,计及地震激励的转动分量引起的哥氏效应 .在 Kanai- Tajimi模型基础上 ,推出了包括 3个平动分量和 3个转动分量的地震激励加速度表达式 ,其被视为非平稳随机过程 ,并作数值仿真 .分别就仅计及地震激励 3个平动分量、计及 3个平动分量和 3个转动分量的情况 ,采用 Newmark直接积分法计算转子 -轴承系统的瞬态振动响应 ,结果显示 。

Equations of motion of a rotor bearing system for calculating its transient response to seismic excitation was established by using the flexible beam model with Coriolis effects taken into account when the base is subjected to a motion that simulates an earthquake with rotational components. The six component earthquake ground motions were modeled as nonstationary random processes including three translations and three rotations. Based on Kanai Tajimi model, the formulas for all six components of seismic excitation acceleration were derived. The numerical simulation was performed. The transient response of a typical rotor bearing system under earthquake excitation was computed by means of Newmark's integral method. The comparison between the responses under the seismic input excluding base rotations and those under the excitation with all six components demonstrates the significant influence of the base rotations on the rotational type responses that obviously increase.