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.
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December 2012
Research-Article
Rotor Model Updating and Validation for an Active Magnetic Bearing Based High-Speed Machining Spindle
Alexander H. Pesch
Alexander H. Pesch
Center for Rotating Machinery Dynamics and Control (RoMaDyC),
Cleveland State University
,Cleveland, OH 44115-2214
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Jerzy T. Sawicki
Fellow ASME
Alexander H. Pesch
Center for Rotating Machinery Dynamics and Control (RoMaDyC),
Cleveland State University
,Cleveland, OH 44115-2214
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.
J. Eng. Gas Turbines Power. Dec 2012, 134(12): 122509 (6 pages)
Published Online: October 25, 2012
Article history
Received:
June 21, 2012
Revision Received:
June 30, 2012
Citation
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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