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Authors and Affiliations

Tomasz Szolc
1
ORCID: ORCID

  1. Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawi´nskiego 5B, 02-106 Warsaw, Poland
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Abstract

The authors present the part of research devoted to the "squat" -type crack development in the heads of railway rails. This paper contains description of the results of investigations of the influence of the dynamic interaction, between the railway bogie running along the track on the "squat't-type crack development. The studies are performed by the use of computer simulation technique. The study is divided into two parts. The first part explains, how the vertical displacement of the wheel varies during the quasi-static rolling of the bo gie wheel along the cracked rail. In the second part of the paper, this displacements fluctuation is introduced to dynamic analysis. The histories of the wheel-rail force fluctuation during passage along the rail with the "squat'l-type crack were obtained as the result of dynamic analysis.
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Authors and Affiliations

Mirosław Olzak
Tomasz Szolc
ORCID: ORCID
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Bibliography

  1.  J. Kiciński, “Rotor dynamics ― still open questions,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139791, 2021, doi: 10.24425/ bpasts.2021.139791.
  2.  S. Nitzschke, Ch. Ziese, and E. Woschke, “Analysis of dynamical behaviour of full-floating disk thrust bearings,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139001, 2021, doi: 10.24425/bpasts.2021.139001.
  3.  J. Zapoměl and P. Ferfecki, “Vibration control of rotors mounted in hydrodynamic bearings lubricated with magnetically sensitive oil by changing their load capacity,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e137988, 2021, doi: 10.24425/bpasts.2021.137988.
  4.  P. Kurnyta-Mazurek, T. Szolc, M. Henzel, and K. Falkowski, “Control system with a non-parametric predictive algorithm for a high- speed rotating machine with magnetic bearings,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e137988, 2021, doi: 10.24425/ bpasts.2021.138998.
  5.  J. Jungblut, Ch. Fischer, and S. Rinderknecht, “Active vibration control of a gyroscopic rotor using experimental modal analysis,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e138090, 2021, doi: 10.24425/bpasts.2021.138090.
  6.  T. Drapatow, O. Alber, and E. Woschke, “Consideration of fluid inertia and cavitation for transient simulations of squeeze film damped rotor systems,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139201, 2021, doi: 10.24425/bpasts.2021.139201.
  7.  B. Schüßler, T. Hopf, and S. Rinderknecht, “Simulative investigation of rubber damper elements for planetary touch-down bearings,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139615, 2021, doi: 10.24425/bpasts.2021.139615.
  8.  G. Quinz, M. Prem, M. Klanner, and K. Ellermann, “Balancing of a linear elastic rotor-bearing system with arbitrarily distributed un- balance using the Numerical Assembly Technique,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e138237, 2021, doi: 10.24425/ bpasts.2021.138237.
  9.  M. Klanner, M. Prem, and K. Ellermann, “Quasi-analytical solutions for the whirling motion of multi-stepped rotors with arbitrarily distributed mass unbalance running in anisotropic linear bearings,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e138999, 2021, doi: 10.24425/bpasts.2021.138999.
  10.  S. Bastakoti et. al., “Model-based residual unbalance identification for rotating machines,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139790, 2021, doi: 10.24425/bpasts.2021.139790.
  11.  T. Szolc and R. Konowrocki, “Research on stability and sensitivity of the rotating machines with overhung rotors to lateral vibrations,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e137987, 2021, doi: 10.24425/bpasts.2021.137987.
  12.  Ch. Prasad, P. Snabl, and L. Pešek, “A meshless method for subsonic stall flutter analysis of turbomachinery 3D blade cascade,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139000, 2021, doi: 10.24425/bpasts.2021.139000.
  13.  F. Gaulard, J. Schmied, and A. Fuchs, “State-of-the-art rotordynamic analyses of pumps”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 69, no. 6, p. e139316, 2021, doi: 10.24425/bpasts.2021.139316.
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Authors and Affiliations

Horst Ecker
1
Rainer Nordmann
2
Tadeusz Burczyński
3
ORCID: ORCID
Tomasz Szolc
3
ORCID: ORCID

  1. Vienna University of Technology, Institute of Mechanics and Mechatronics, Getrieidemarkt 9, 1060 Vienna Austria
  2. Technical University of Darmstadt, Institute for Mechatronic Systems, Otto-Berndt Strasse 2, 64287 Darmstadt, Germany
  3. Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland
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Abstract

The rotating machines with overhung rotors form a broad class of devices used in many types of industry. For this kind of rotor machine in the paper, there is investigated an influence of dynamic and static unbalance of a rotor, parallel and angular misalignments of shafts, and inner anisotropy of rigid couplings on system dynamic responses. The considerations are performed through a hybrid structural model of the machine rotor-shaft system, consisting of continuous beam finite elements and discrete oscillators. Numerical calculations are carried out for parameters characterizing a heavy blower applied in the mining industry. The main goal of the research is to assess the sensitivity of the imperfections mentioned above on excitation severity of rotor-shaft lateral vibrations and motion stability of the machine in question.
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Bibliography

  1. K. Nandakumar and A. Chatterjee, “Nonlinear secondary whirl of an overhung rotor”, in Proc. R. Soc. A., vol. 466, pp. 283–301, 2010, doi: 10.1098/rspa.2009.0262.
  2.  O. Cakmak and K.Y. Sanliturk, “A dynamic model of an overhung rotor with ball bearings”, in Proc. Inst. Mech. Eng., Part K: J. Multi- body Dyn., vol. 255, no. 4, pp. 310–321, 2011, doi: 10.1177/1464419311408949.
  3.  Ch. Fu, X. Ren, Y. Yang, and W. Qin, “Dynamic response analysis of an overhung rotor with interval uncertainties”, Nonlinear Dyn., vol. 89, pp. 2115–2124, 2017, doi: 10.1007/s11071-017-3573-3.
  4.  E. Chipato, A.D. Shaw, and M.I. Friswell, “Frictional effects on the Nonlinear Dynamics, of an overhung rotor”, Commun. Nonlinear Sci. Numer. Simul., vol. 78, p. 104875, 2019.
  5.  ISO 1940/1, ”Balance Quality Requirements of Rigid Rotors”, International Organization for Standardization, 2003.
  6.  K.M. Al-Hussain and I. Redmond, “Dynamic response of two rotors connected by rigid mechanical coupling with parallel misalignment”, Sound Vib., vol. 249, no. 3, pp. 483–498, 2002.
  7.  K.M. Al-Hussain, “Dynamic stability of two rigid rotors connected by a flexible coupling with angular misalignment”, J. Sound Vib., vol. 266, no. 2, pp. 217–234, 2002.
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  9.  I. Redmond, “Study of a misaligned flexibly coupled shaft system having nonlinear bearings and cyclic coupling stiffness – Theoretical model and analysis”, J. Sound Vib., vol. 329, pp. 700–720, 2010.
  10.  J. Didier, J.-J. Sinou and B. Faverjon, “Study of the nonlinear dynamic response of a rotor system with faults and uncertainties”, J. Sound Vib., vol. 331, pp. 671–703, 2012.
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  13.  J. Malta, “Investigation of anisotropic rotor with different shaft orientation”, Doctoral Thesis, Darmstadt University of Technology, Department of Machinery Construction, D 17, Darmstadt, 2009.
  14.  T. Szolc, P. Tauzowski, R. Stocki, and J. Knabel, ”Damage identification in vibrating rotor-shaft systems by efficient sampling approach”, Mech. Syst. Signal Process., vol. 23, pp. 1615–1633, 2009.
  15.  T. Szolc, “On the discrete-continuous modeling of rotor systems for the analysis of coupled lateral-torsional vibrations”, Int. J. Rotating Mach., vol. 6, no. 2, pp. 135–149, 2000.
  16.  T. Szolc, K. Falkowski, M. Henzel, and P. Kurnyta-Mazurek, “The determination of parameters for a design of the stable electro-dynamic passive magnetic support of a high-speed flexible rotor”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 67, no. 1, pp. 91–105, 2019.
  17.  A. Pręgowska, R. Konowrocki, and T. Szolc, “On the semi-active control method for torsional vibrations in electro-mechanical systems by means of rotary actuators with a magneto-rheological fluid”, J. Theor. Appl. Mech., vol. 51, no. 4, pp. 979–992, 2013.
  18.  R. Lasota, R. Stocki, P. Tauzowski, and T. Szolc, ”Polynomial chaos expansion method in estimating probability distribution of rotor-shaft dynamic responses”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 63, no. 1, pp. 413–422, 2015.
  19.  Y. Ma, Z. Liang, M. Chen, and J. Hong, “Interval analysis of rotor dynamic response with uncertain parameters”, J. Sound Vib., vol. 332, pp. 3869–3880, 2013.
  20.  Z. Qiu and X. Wang, “Parameter perturbation method for dynamic responses of structures with uncertain-but-bounded parameters based on interval analysis”, Int. J. Solids Struct., vol. 42, pp. 4958–4970, 2005.
  21.  Ch. Fu, Y. Xu, Y. Yang, K. Lu, F. Gu, and A. Ball, “Response analysis of an accelerating unbalanced rotating system with both random and interval variables”, J. Sound Vib., vol. 466, p. 115047, 2020. https://doi.org/10.1016/j.jsv.2019.115047.
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Authors and Affiliations

Tomasz Szolc
1
ORCID: ORCID
Robert Konowrocki
1
ORCID: ORCID

  1. Institute of Fundamental Technological Research of the Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland
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Abstract

Many industrial rotating machines driven by asynchronous motors are often affected by detrimental torsional vibrations. In this paper, a method of attenuation of torsional vibrations in such objects is proposed. Here, an asynchronous motor under proper control can simultaneously operate as a source of drive and actuator. Namely, by means of the proper control of motor operation, it is possible to suppress torsional vibrations in the object under study. Using this approach, both transient and steady-state torsional vibrations of the rotating machine drive system can be effectively attenuated, and its precise operational motions can be assured. The theoretical investigations are conducted by means of a structural mechanical model of the drive system and an advanced circuit model of the asynchronous motor controlled using two methods: the direct torque control – space vector modulation (DTC-SVM) and the rotational velocity-controlled torque (RVCT) based on the momentary rotational velocity of the driven machine working tool. From the obtained results it follows that by means of the RVCT technique steady-state torsional vibrations induced harmonically and transient torsional vibrations excited by switching various types of control on and off can be suppressed as effectively as using the advanced vector method DTC-SVM.
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Authors and Affiliations

Paweł Hańczur
1 2
Tomasz Szolc
1
ORCID: ORCID
Robert Konowrocki
1
ORCID: ORCID

  1. Institute of Fundamental Technological Research of the Polish Academy of Sciences, ul. Pawinskiego 5B, 02-106 Warsaw, Poland
  2. Schneider Electric Polska Sp. z o.o, ul. Konstruktorska 12, 02-673 Warsaw, Poland
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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.
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Bibliography

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  2.  E. Brusa, “Semi-active and active magnetic stabilisation of supercritical rotor dynamics by contra-rotating damping,” Mechatronics, vol. 24, pp. 500–510, 2014, doi: 10.1016/j.mechatronics.2014.06.001.
  3.  O. Halminen, A. Kärkkäinen, J. Sopanen, and A. Mikkola, “Active magnetic bearing-supported rotor with misaligned cageless backup bearings: A dropdown event simulation model,” Mech. Syst. Signal Process., vol. 50‒51, pp. 692–705, 2015, doi: 10.1016/j. ymssp.2014.06.001.
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  5.  J. Sawicki, E.H. Maslen, and K.R. Bischof, “Modeling and performance evaluation of machining spindle with active magnetic bearings,” J. Mech. Sci. Technol., vol. 21, pp. 847–850, 2007, doi: 10.1007/BF03027055.
  6.  R. Siva Srinivas, R. Tiwari, and Ch. Kannababu, “Application of active magnetic bearings in flexible rotordynamic systems – A state-of- the-art review,” Mech. Syst. Signal Process., vol. 106, pp. 537‒572, 2018.
  7.  K. Falkowski, M. Henzel, and M. Żokowski, “The analysis of the control system for the bearingless induction electric motor,” J. Vibroeng., vol. 14, no. 1, pp.16‒21, 2012.
  8.  R. Stocki, T. Szolc, P. Tauzowski, and J. Knabel, “Robust design optimisation of the vibrating rotor shaft system subjected to selected dynamic constraints,” Mech. Syst. Signal Process., vol. 29, pp. 34‒44, 2012, doi: 10.1016/j.ymssp.2011.07.023.
  9.  T. Szolc, K. Falkowski, M. Henzel, and P. Kurnyta-Mazurek, “Determination of parameters for a design of the stable electro-dynamic passive magnetic support of a high-speed flexible rotor,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 67, no. 1, pp. 91‒105, 2019, doi: 10.24425/ bpas.2018.125719.
  10.  S. Zhe et al., “Identification of active magnetic bearing system with a flexible rotor,” Mech. Syst. Signal Process., vol. 49, pp. 302–316, 2014.
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Authors and Affiliations

Paulina Kurnyta-Mazurek
1
Tomasz Szolc
2
ORCID: ORCID
Maciej Henzel
1
Krzysztof Falkowski
1

  1. Faculty of Mechatronics, Armament and Aerospace, Military University of Technology, ul. gen. Sylwestra Kaliskiego 2, 00-908, Warsaw, Poland
  2. Institute of Fundamental Technological Research, Polish Academy of Science, ul. Adolfa Pawińskiego 5B, 02-106, Warsaw, Poland

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