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转子的动力特性受到很多因素的影响,其中,支承系统的刚度是一个重要因素。通过在有限元分析软件ANSYS中建立某小型燃气轮机支承系统的三维有限元模型,分析了其静刚度和动刚度。以该燃气轮机的压气机转子为例,文中考察了支承系统的刚度对其临界转速和稳态不平衡响应的影响。计算结果表明,与仅考虑轴承的支承刚度相比,同时考虑支承系统刚度的情况下,压气机转子的第一阶临界转速下降了约54%,其第一级叶轮的稳态不平衡位移响应的峰值下降了56.9%。
The dynamic characteristics of the rotor are affected by many factors, of which the stiffness of the bearing system is an important factor. Through the establishment of the finite element model of a small gas turbine bearing system in the finite element analysis software ANSYS, its static stiffness and dynamic stiffness are analyzed. Taking the compressor rotor of the gas turbine as an example, the influence of the stiffness of the support system on the critical speed and the steady-state unbalance response is investigated. The calculated results show that the first critical speed of the compressor rotor is decreased by about 54% when considering the stiffness of the bearing system, considering only the bearing stiffness. The steady-state unbalanced displacement response of the first stage impeller The peak fell by 56.9%.