三支撑轴系转子残余不平衡量相位差组合振动特性研究

摘要

针对三支撑汽轮机组、压缩机组等轴系中各转子动平衡合格,但安装试车后仍发生轴系不平衡振动故障问题,提出研究各跨转子残余不平衡量相位差组合对轴系振动特性的影响.首先,通过构建两跨三支撑轴系动力学有限元模型,进行轴系转子间残余不平衡量相位差典型组合,分析三支撑轴系不平衡稳态响应,得到轴系支撑处振动随各转子残余不平衡量相位差典型组合的关系,发现残余不平衡量相位差组合对高转速下轴系振动影响大,以0-180典型组合下各支撑振动幅值最小,不同于传统双支撑轴系0-0组合下振动最优的结论,最后开展轴系残余不平衡量相位差组合振动特性实验验证.论文结论可为这类三支撑轴系不平衡振动故障诊断和控制提供新的思路和参考.%Although each rotor is balanced well,unbalance vibration fault still exists for the shafting with three supports (i.e.,steam turbine,compressor unit,etc.).The effect of residual unbalance phase difference on vibration characteristics of shafting with three supports is investigated in this paper.A finite element model is developed for shafting with two spans and three supports to analyze the steady-state response.Additionally,the combination of residual unbalances phase difference among multi rotors is presented.The relationship between the supports vibration and the residual unbalance phase difference among multi rotors are confirmed.The phase difference of shafting with residual unbalance mostly affects the shafting vibration in the high speed,and the minimum vibration amplitude for the shafting is from 0-180.Obviously,it is different from the traditional shafting with four supports.Finally,the vibration experiment for the phase difference of shafting residual unbalances is performed to validate the simulation predictions.It is a new way to suppress the unbalance vibration fault for this kind of shafting with multi rotors.