高炉煤气余压透平转子弯曲振动模态分析研究

对高炉煤气余压发电机组的透平转子进行了支撑在支架上和弹性钢丝绳悬吊状态下的模态测试,探讨了不同约束方式对转子模态的影响。在此基础上建立了透平转子的有限元模型,分析了其在自由状态下的模态,并将该转子前三阶主要弯曲振动固有频率的有限元计算值和试验测试值做了对比研究。研究结果表明:支撑在支架上的透平转子可能有介于水平和垂直方向的模态存在;弹性钢丝绳悬吊状态下的透平转子可近似为自由状态;透平转子固有频率有限元分析结果和实测值吻合很好,特别是在低阶频率,这对透平转子的模态分析有一定指导意义。

Modal Analysis of the Rotor's Bending Vibration for the Blast Furnace Top Gas Pressure Recovery Turbine

The modal tests of turbine rotor for the blast furnace top gas pressure recovery turbine unit （TRT） are accomplished with rotor supported on the bracket and the elastic rope suspended state respectively. The effect of different constraints on rotor modal is analyzed. Based on the finite element model of the turbine rotor in a free state, the modes are given by the modal analysis of the TRT＇ rotor, then the calculation values and the measured values of the main natural bending vibration frequency are compared. The results show that the turbine rotor supported on the bracket may exist modes between the horizontal and vertical orientations, whereas turbine rotor suspended on flexible steel wire rope can be approximately taken as free state. Simultaneously, the finite element analysis results and the measured values of turbine rotor＇s natural frequency agree well especially in lower order frequencies. This may serve as a reference for future turbine rotor＇s modal analysis.