摘要
发电机端盖振动超标严重影响电厂安全运行。通过对端盖的振动模态测试与分析，测得端盖的各阶模态参数，用有限元法建立其振动特征方程，并通过子空间迭代法求其特征值和特征矢量。发现端盖在工频附近存在固有频率，二阶固有频率谐振是造成励侧端盖振动故障的主要原因。提出了端盖加筋的消振处理方案。理论分析和实测表明，加筋后大大改善了端盖的动态特性，端盖振动也随之消除。
The serious vibration of the endcover of a turbogenerator harms the normal operation in a thermal power plant.The modal parameters of the endcover are measured by the experimental modal analysis,and the eigenvalue and eigenvector are calculated by solving the characteristic equation with the subspace iteration method.After that it was found that some natural frequencies exist near the running speed of the generator.There fore,the endcover had been ribbed.It was proved by calculation and measurement,the dynamic characteristics of the stiffened endcover had been improved,and the vibration had been much decreased.
出处
《中国电机工程学报》
EI
CSCD
北大核心
1999年第11期69-71,共3页
Proceedings of the CSEE
关键词
发电机端盖
故障诊断
模态试验
有限元法
generator's cover
fault diagnosis
modal testing
finite element methods
