A compressor rotor is composed by the several parts, such as impellers, thrust discs, sleeves, and couplings which are shrunk fitted to the shaft.
The contribution to the shaft stiffness by the shrunk fitted elements is discussed, and smaller diameter shaft stiffness penetration to the large diameter section is also evaluated.
Analytical approach by Finite Element Analysis, combined with the experimental investigation of the model compressor rotor results in the accuracy improvement of the natural frequency calculation of the assembled rotor. By the parametric survey, the equivalent shaft stiffness method is proposed for the shrunk elements and shaft stepping. This approach contributes the compressor rotor dynamics design assessment especially supported by the active magnetic bearing.
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