摘要
大型汽轮发电机两侧大多采用端盖式轴承,支撑刚度较小。考虑汽轮发电机结构特点,建立了端盖式轴承对振动影响分析模型,将油膜动力特性以刚度和阻尼系数表示,将端盖式轴承动力特性以试验实测频响函数表示,以等效动刚度反映轴颈和基础之间的支撑特性。将该方法应用于大型汽轮发电机,试验实测端盖式轴承频响函数,分析端盖轴承对发电机振动的影响,利用动刚度模型比较好地解释了现场发生的转轴不振动而轴承座振动异常现象。
End cap bearings are mostly used on both sides of large steam turbine generators. The support stiffness is small.Considering the structural characteristics of turbo generator, an analysis model of the influence of end cap bearing on vibration is established. The dynamic characteristics of oil film are expressed by stiffness and damping coefficients, the dynamic characteristics of end cap bearing are expressed by the measured frequency response function, and the support characteristics between journal and foundation are reflected by equivalent dynamic stiffness. The method is applied to a large turbo generator. The frequency response function of the end cover bearing is measured. The influence of the end cover bearing on the generator vibration is analyzed. The dynamic stiffness model is used to explain the abnormal phenomenon that the rotating shaft does not vibrate but the bearing pedestal vibrates in the field.
作者
薛爱轩
王骐
符朝阳
XUE Ai-xuan;WANG Qi;FU Zhao-yang(Kaifeng Power Co.)
出处
《电站系统工程》
2022年第5期46-48,共3页
Power System Engineering
基金
国家电投集团河南电力有限公司科技项目资助。
关键词
汽轮发电机
振动
频响函数
turbine generator
vibration
frequency response function
