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Paulina Kurnyta-Mazurek, PhD

Military University of Technology (PL)

Doctoral thesis
2021-11-17 Opracowanie i badania zaawansowanych algorytmów sterowania magnetycznym podparciem wirnika silnika odrzutowego  (WAT)
supervisor -- Prof. Tomasz Szolc, PhD, DSc, IPPT PAN
supervisor -- Prof. Maciej Henzel, PhD, DSc, WML WAT
 

Recent publications
1.  Kurnyta-Mazurek P., Szolc T., Henzel M., Falkowski K., Control system with a non-parametric predictive algorithm for a high-speed rotating machine with magnetic bearings, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 2300-1917, DOI: 10.24425/bpasts.2021.138998, Vol.69, No.6, pp.e138998-1-9, 2021

Abstract:
This paper deals with research on the magnetic bearing control systems for a high-speed rotating machine. Theoretical and experimental characteristics of the control systems with the model algorithmic control (MAC) algorithm and the proportional-derivative (PD) algorithm are presented. The MAC algorithm is the non-parametric predictive control method that uses an impulse response model. A laboratory model of the rotor-bearing unit under study consists of two active radial magnetic bearings and one active axial (thrust) magnetic bearing. The control system of the rotor position in air gaps consists of the fast prototyping control unit with a signal processor, the input and output modules, power amplifiers, contactless eddy current sensors and the host PC with dedicated software. Rotor displacement and control current signals were registered during investigations using a data acquisition (DAQ) system. In addition, measurements were performed for various rotor speeds, control algorithms and disturbance signals generated by the control system. Finally, the obtained time histories were presented, analyzed and discussed in this paper.

Keywords:
magnetic bearing; predictive algorithm; high speed rotating machine

Affiliations:
Kurnyta-Mazurek P. - Military University of Technology (PL)
Szolc T. - IPPT PAN
Henzel M. - Military University of Technology (PL)
Falkowski K. - Military University of Technology (PL)
2.  Szolc T., Falkowski K., Kurnyta-Mazurek P., Design of a combined self-stabilizing electrodynamic passive magnetic bearing support for the automotive turbocharger rotor, JOURNAL OF VIBRATION AND CONTROL, ISSN: 1077-5463, DOI: 10.1177/1077546320933486, pp.1-12, 2020

Abstract:
The purpose of this study is to create a concept for what would be a structurally simple and perationally robust support for the automotive turbocharger rotor in electrodynamic passive magnetic bearings. Because this kind of magnetic suspension-in its fundamental version-is dynamically unstable, to avoid the disadvantages contained therein, what is being proposed is the addition of external damping through the employment of the newly designed combined self-stabilizing electrodynamic passive magnetic bearing. The electromagnetic stiffness and damping characteristics of combined electrodynamic passive magnetic bearings have been determined for various shaft rotational speeds by means of the advanced 3D finite element method. In this study, a dynamic interaction between the turbocharger rotor shaft and the passive magnetic suspension is proposed as a support for both the fundamental electrodynamic passive magnetic bearings and the suggested combined self-stabilizing passive magnetic bearings. Here, the main attention is focused on the asymptotic stability of both the rotor shaft suspension variants. The additional damping magnitudes required to stabilize the most sensitive lateral eigenmodes of the object under consideration have been determined by means of the Routh-Hurwitz stability criterion.

Keywords:
rotor dynamics, combined electrodynamic passive magnetic bearings, turbocharger flexible rotor shaft, stability analysis, stabilizing damping magnitude

Affiliations:
Szolc T. - IPPT PAN
Falkowski K. - Military University of Technology (PL)
Kurnyta-Mazurek P. - Military University of Technology (PL)
3.  Szolc T., Falkowski K., Henzel M., Kurnyta-Mazurek P., Determination of parameters for a design of the stable electro-dynamic passive magnetic support of a high-speed flexible rotor, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.24425/bpas.2018.125719, Vol.67, No.1, pp.91-105, 2019

Abstract:
Electro-dynamic passive magnetic bearings are now viewed as a feasible option when looking for support for high-speed rotors. Nevertheless, because of the skew-symmetrical visco-elastic properties of such bearings, they are prone to operational instability. In order to avoid this, the paper proposes the addition of external damping into the newly designed vibrating laboratory rotor-shaft system. This may be achieved by means of using simple passive dampers that would be found among the components of the electro-dynamic bearing housings along with magnetic dampers, which satisfy the operational principles of active magnetic bearings. Theoretical investigations are going to be conducted by means of a structural computer model of the rotor-shaft under construction, which will take into consideration its actual dimensions and material properties. The additional damping magnitudes required to stabilize the most sensitive lateral eigenmodes of the object under consideration have been determined by means of the Routh-Hurwitz stability criterion.

Keywords:
rotor-dynamics, electrodynamic passive magnetic bearings, flexible rotor-shaft, active magnetic damper, stability analysis

Affiliations:
Szolc T. - IPPT PAN
Falkowski K. - Military University of Technology (PL)
Henzel M. - Military University of Technology (PL)
Kurnyta-Mazurek P. - Military University of Technology (PL)
4.  Kurnyta-Mazurek P., Kurnyta A., Pręgowska A., Kaźmierczak K., Frąś L.J., Application concept of the active magnetic suspension technology in the aircraft engine, Aviation Advances & Maintenance, ISSN: 2543-9456, DOI: 10.2478/afit-2018-0006, Vol.41, No.1, pp.161-193, 2018

Conference papers
1.  Szolc T., Falkowski K., Henzel M., Kurtyna-Mazurek P., Passive and active stabilization of the electro-dynamic magnetic bearings supporting high-speed rotors, VITM 11, Vibrations In Rotating Machinery, IMechE, 2016-09-13/09-15, Machester (GB), pp.721-731, 2016

Abstract:
The electrodynamic passive magnetic bearings became now a very promising kind of support for high-speed rotors. Nevertheless, because of skew-symmetrical visco-elastic properties of such bearings, they are sensitive to operational instability. In order to avoid this disadvantage, in the paper there are proposed stabilization concepts reducing to an introduction of a sufficient magnitude of additional external damping into the vibrating rotor-shaft system. This purpose is going to be realized by means of simple and effective passive dampers built in the electrodynamic bearing housings as well as using heteropolar magnetic dampers which realize operational principles of the active magnetic bearing. The theoretical investigations are going to be carried out by means of a structural computer model of the rotor-shaft system, taking into consideration its full geometry and material properties.

Affiliations:
Szolc T. - IPPT PAN
Falkowski K. - Military University of Technology (PL)
Henzel M. - Military University of Technology (PL)
Kurtyna-Mazurek P. - Military University of Technology (PL)

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