摘要
以某1 000MW机组轴系为研究对象建立了有限元模型,利用该模型研究了三支撑结构的振动特性,并进行了试验验证.结果表明:发电机两端的支撑特性对三支撑结构振动的影响较大,现场动平衡需要考虑的因素较多,当判断不平衡形式和轴向位置时,需要考虑主跨两端的支撑特性;若仅仅简单地按照谐分量法直接判断不平衡形式,则在振动处理中可能导致反复动平衡均无效,甚至使振动发散.
A finite element model was set up for the shafting of a 1 000 MW unit, based on which verifica tion tests were carried out to study the vibration characteristics of its three-bearing supporting structure. Results show that the supporting characteristics at both ends of the generator have great effects on vibra tion of the three-bearing supporting structure. Many factors should be considered during field balancing. When determinating the form and axial position of an imbalance, the main-span supporting characteristics should be taken into consideration. In case that the imbalance form is determined directly according to the harmonic component method, repeated dynamic balancing may be ineffective, and even divergent vibration may be caused during vibration treatment.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第3期205-209,共5页
Journal of Chinese Society of Power Engineering
关键词
汽轮发电机组
支撑特性
三支撑结构
振动
turbo-generator unit
supporting characteristic
three-bearing supporting structure
vibration
