【作者】 刘男杰； 方之楚；

【Author】 Liu Nanjie Fang Zhichu(Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200030, China)

【机构】 上海交通大学工程力学系；

【摘要】 首先建立旋转机械系统地震激励下的运动微分方程,然后推出了包括3个平动分量和3个转动分量、表现为非平稳随机过程的地震激励表达式。采用直接积分法计算了旋转机械系统的地震响应,结果显示地震激励的转动分量使转动类型响应有明显的增大。更多还原

【Abstract】 Equations of motion of a rotating machinery system for calculating its vibration response to seismic excitation is established by using a beam model with Coriolis effects taken into account when the base is subjected to an earthquake excitation with rotational components. The six-component earthquake ground motions are modeled as nonstation-ary random processes including three translations and three rotations, the formulas for which are derived out based on Kanai-Tajimi model. The vibration response of a typical rotating machinery system under earthquake excitation is computed by means of Newmark’ s integral method. The comparison between the responses under the three-translation seismic input and those under the excitation with all six components demonstrates the significant influence of the base rotations on the rotational type responses, which evidendy grow.更多还原