转子—轴承系统参数的修正

Parameter Identification for Rotor-Bearing System

本文导出临界转速对轴段的抗弯刚度、结点质量、油膜刚度、轴承座的静刚度及当量质量等参数的敏感度。当实测的临界转速已知时,用最优化及迭代方法可以求得对数学模型参数的修正方法。为了说明本方法的应用,计算了一个多跨转子——轴承系统,计算结果说明,这方法能给出今人满意的修正模型。而且在迭代过程中,收敛速度也是很快的。

The sensitivities of the critical speeds to the parameters such as the flexuralrigidity of the section,lumped mass of the station,stiffness of the oil-film,andthe static stiffness and equivalent mass of the pedestal etc.are derived in thispaper.When the experimental critical speeds are known,the approach for adju-sting the parameters of the mathematical model can be obtained by means ofoptimum technipue and iterative procedure.To demonstrate some applicationsof the analysis,calculations have been performed for a multi-span rotor-bearingsystem.The numerical results showed that the satisfactory modified models canbe obtained by the present method,and the rate of convergence in iterative pro-cedure is rather fast.