Including the Effects of Flexible Bearing Supportsin Rotating Machinery

[摘要] Unbalance response and stability analyses of a flexible rotor on three lobe journalbearings on flexible supports are presented. The influence of the support structure wasincluded in the analyses using polynomial transfer functions. These transfer functionswere extracted from measured dynamic compliance data of the support structure,measured at the bearing locations. Numerical predictions using polynomial transferfunctions and single mass supports are compared to the experimental data. Predictionsusing the transfer function representation of the support structure show a clear improvementover the predictions using single mass supports without over-complicatingthe problem. The predicted critical speeds are within 2.9% of the measured criticalspeeds. The predicted stability threshold agrees with the measured stability thresholdwithin 1%. The effects of cross talk between supports and cross coupling betweenhorizontal and vertical directions are investigated. The cross talk between supports wasfound to have a strong influence in the results while the influence of cross couplingbetween the vertical and horizontal directions is negligible.

[学科分类] 力学，机械学