汽轮发电机组弹性和固定基础的动刚度探讨  

Inquisition into Dynamic Stiffness for Spring and Conventional Foundations of T/G Units

作　　者：罗勇 王伟强 沙曾炘 

机构地区：[1]隔而固(青岛)减振技术有限公司,青岛266701

出　　处：《电力建设》2005年第9期49-50,58,共3页Electric Power Construction

摘　　要：基础动刚度主要与基础的固有频率有关.在频率15～70Hz内,固定基础和弹性基础都存在多个固有频率.对引进西屋型机组的基础进行有限元计算,结果表明:在接近或远离固有频率时,各种基础动刚度的最大值相差不多,最小值也差不多.因此,弹性基础与固定基础的动刚度处于同一数量级;有限元计算结果还表明,在扰力作用点,座缸式轴承座处基础的水平动刚度大于垂直动刚度.The dynamic stiffness of the foundations is essentially dependent on their natural frequencies. A finite element analysis on the Westinghouse type T/G foundation shows that the dynamic stiffness of the foundations will reach one of the minimum values, when the excitation is near one of the natural frequencies and the one of the maximum values, when far away from the natural frequency and also shows that the hnrizontal dynamic stiffness may be higher than the vertical one at the acting point of the LP rntor excitation for the integrated hearing housing with the LP turbine case.

关 键 词：汽轮发电机组 常规固定基础 弹性基础 有限元分析 动刚度 

分 类 号：TU476.1[建筑科学—结构工程]