This paper presents an experimentally driven model updating approach to address the dynamic inaccuracy of the nominal finite element (FE) rotor model of a machining spindle supported on active magnetic bearings. Modeling error is minimized through the application of a numerical optimization algorithm to adjust appropriately selected FE model parameters. Minimizing the error of both resonance and antiresonance frequencies simultaneously accounts for rotor natural frequencies as well as for their mode shapes. Antiresonance frequencies, which are shown to heavily influence the model’s dynamic properties, are commonly disregarded in structural modeling. Evaluation of the updated rotor model is performed through comparison of transfer functions measured at the cutting tool plane, which are independent of the experimental transfer function data used in model updating procedures. Final model validation is carried out with successful implementation of robust controller, which substantiates the effectiveness of the model updating methodology for model correction.
Rotor Model Updating and Validation for an Active Magnetic Bearing Based High-Speed Machining Spindle
Contributed by International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 21, 2012; final manuscript received June 30, 2012; published online October 25, 2012. Editor: Dilip R. Ballal.
Wroblewski, A. C., Sawicki, J. T., and Pesch, A. H. (October 25, 2012). "Rotor Model Updating and Validation for an Active Magnetic Bearing Based High-Speed Machining Spindle." ASME. J. Eng. Gas Turbines Power. December 2012; 134(12): 122509. https://doi.org/10.1115/1.4007337
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