【摘要】 转子广泛应用于压缩机、航空发动机、汽轮发电机等旋转机械中。转子系统的临界转速和稳定性往往影响着机组是否安全运行。支承系统的刚度是影响转子动力学特性的重要因素。通过在有限元软件中建立某轴流压缩机壳体的三维有限元模型,计算得到其静刚度和动刚度,并与油膜刚度相结合,系统的研究了不同支承刚度条件下,转子系统的临界转速。在考虑等效支承刚度的基础上,根据API标准,计算转子的预期交叉耦合刚度,进而分析了该转子系统的稳定性。临界转速计算结果表明,考虑壳体刚度会降低转子系统的临界转速;稳定性计算结果表明,转子系统的稳定性符合API标准对稳定性裕度的要求。更多还原

【Abstract】 Rotor is widely used in rotating machinery, such as compressor, aero-engine, turbo generator etc. Critical speed and stability always affect the operation safety of the rotating machinery. Rotor supporting stiffness is an important factor that affects its dynamic characteristic. The 3D finite element model of the supporting system of an axial flowing compressor is obtained for analyzing its static stiffness and dynamic stiffness. Subsequently, the effect of different rotor supporting stiffness on its critical speed is investigated combining with bearing stiffness. In addition, the cross coupling stiffness is obtained according to the API standard in order to completely investigate the stability analysis of the rotating system. The FEM simulations show that the critical speed will decrease when considering the compressor shell stiffness and the stability results are consistent with the API standard requirements for stability margin.更多还原