中文摘要：

针对单支撑1 000 MW汽轮机轴系中低压转子轴承3、轴承4和轴承5振动超标的问题,采用有限元法建立轴系动力学有限元模型,在连接两低压转子联轴器位置施加不平衡激励,分析轴系各轴承处振动对联轴器处不平衡量的敏感性.通过调整支撑两低压转子轴承4入口油温的方式来改变其支承动力特性,并研究了其动力特性对轴系稳态响应的影响.结果表明：支承4的动力特性对支撑低压转子2的轴承5处振动影响最大,轴承4次之,而对支撑高压转子的轴承1和轴承2处振动影响相对较小;在工程实际过程中,可适当提高轴承4的入口油温来减小轴系振动.

英文摘要：

To solve the problem of exssive shafting vibration appearing at bearings 3,4 and 5 for IP/LP rators in a 1 000 MW steam turbine with single supports,a dynamic finite element model was set up,so as to analyze the sensitivity of vibration of all bearings to the unbalance excited on the coupling connecting two low-pressure rotors.Moreover,the dynamic coefficient of bearing 4 between two LP rators was altered by changing its inlet oil temperture,thus to study the effects of dynamic coefficient on the steady state response of the shafting.Results show that the dynamic coefficient of bearing 4 has the greatest influence on the vibration of bearing 5,followed by bearing 4,which are for supporting of LP rator 2;whereas the dynamic coefficient of bearing 4 has little influence on the vibration of bearing 1 and 2 for the HP rator.The excessive shafting vibration could be reduced by improving the inlet oil temperature of bearing 4 in actual applications.