基于有限元法的转子临界转速计算

Rotor critical speed calculation based on finite element method

在转子系统临界转速计算中,有限元法能够确保模型的完整性和分析的准确性,可以进行复杂转子系统的临界转速计算,针对各维有限元模型计算精度和计算速度的问题,分析了一维、二维、三维有限元模型的优缺点,明确了在不同设计和分析阶段各维模型的选用原则,以满足临界转速计算的需要,并以涡轮泵临界转速的计算进行了验证。结果表明,二维模型在一般情况下兼具一维和三维模型的优点,计算速度快,求解精确;对转子系统的临界转速计算有着较大的参考价值。

In calculating the rotor system critical speed, the finite element method can ensure the integrity of the model and the accuracy of analysis, and allow the calculation of the complex rotor system critical speed. With the precision and speed problems of calculation in each dimensional finite element model, the advantages and disadvantages of ID, 2D and 3D finite element model was analyzed, the selection principle of each dimensional finite element model at different design and analysis stage was defined so as to meet the needs of the critical speed calculation, and verified with the calculation of turbine pump critical speed. The results show that 2D model has the advantages of 1D model and 3D model in normal condition, the computing speed is fast and solution is accurate; and has important reference value for rotor system critical speed calculation.