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2017 | nr 4 | 108--115
Tytuł artykułu

The experimental identification of the dynamic coefficients of two hydrodynamic journal bearings operating at constant rotational speed and under nonlinear conditions

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Hydrodynamic bearings are commonly used in ship propulsion systems. Typically, they are calculated using numerical or experimental methods. This paper presents an experimental study through which it has been possible to estimate 24 dynamic coefficients of two hydrodynamic slide bearings operating under nonlinear conditions. During the investigation, bearing mass coefficients are identified by means of a newly developed algorithm. An impact hammer was used to excite vibration of the shaft. The approximation by means of the least squares method was applied to determine bearing dynamic coefficients. Based on the performed research, the four (i.e. two main and two crosscoupled) coefficients of stiffness, damping and mass for each bearing were obtained. The mass coefficients add up to the complex shaft weight. These values are not required for modeling dynamics of the machine because the rotor mass is usually known, however, they may serve as a good indicator to validate the correctness of the stiffness and damping coefficients determined. Additionally, the experimental research procedure was described. The signals of displacements in the bearings and the excitation forces used for determination of the bearing dynamic coefficients were shown. The study discussed in this article is about a rotor supported by two hydrodynamic bearings operating in a nonlinear manner. On the basis of computations, the results of bearing dynamic coefficients were presented for a selected speed.
Wydawca

Rocznik
Tom
Strony
108--115
Opis fizyczny
Bibliogr. 23 poz., rys., tab.
Twórcy
  • Institute of Fluid Flow Machinery Polish Academy of Sciences Fiszera 14, 80-231 Gdańsk Poland
autor
  • Institute of Fluid Flow Machinery Polish Academy of Sciences Fiszera 14, 80-231 Gdańsk Poland
  • Gdańsk University of Technology, Faculty of Ocean Engineering and Ship Technology, Poland
Bibliografia
  • 1. Arora, V., Van Der Hoogt, P.J.M., Aarts, R.G.K.M., De Boer, A.: Identification of stiffness and damping characteristics of axial air-foil bearings. International Journal of Mechanics and Materials in Design. 2011, 7(3), pp. 231–243.
  • 2. Bagiński, P., Żywica, G.: Analysis of dynamic compliance of the supporting structure for the prototype of organic Rankine cycle micro-turbine with a capacity of 100 kWe. Journal of Vibroengineering. 2016, 18(5), pp. 3153–3163.
  • 3. Błaszczyk, A., Głuch, J., Gardzilewicz, A.: Operating and economic conditions of cooling water control for marine steam turbine condensers. Polish Maritime Research. 2012, 18(3), pp. 48–54.
  • 4. Breńkacz, Ł.: Identification of stiffness, damping and mass coefficients of rotor-bearing system using impulse response method. Journal of Vibroengineering. 2015, 17(5), pp. 2272–2282.
  • 5. Breńkacz, Ł., Żywica, G.: The Sensitivity Analysis of the Method for Identification of Bearing Dynamic Coefficients. In J. Awrejcewicz (Ed.), Dynamical Systems: Modelling: Łódź Poland, December 7-10, 2015. Cham: Springer International Publishing 2016, pp. 81–96.
  • 6. Chatterton, S., Pennacchi, P., Dang, P.V., Vania, A.: Identification Dynamic Force Coefficients of a Five-Pad Tilting-Pad Journal Bearing. In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. 2015, pp. 931–941.
  • 7. Dang, P.V., Chatterton, S., Pennacchi, P., Vania, A.: Effect of the load direction on non-nominal five-pad tilting-pad journal bearings. Tribology International. 2016, 98, pp. 197–211.
  • 8. Delgado, A.: Experimental identification of dynamic force coefficients for a 110 mm compliantly damped hybrid gas bearing. Journal of Engineering for Gas Turbines and Power. 2015, 137(7), pp. 72502-72502–8.
  • 9. Dimond, T.W., Sheth, P.N., Allaire, P.E., He, M.: Identification methods and test results for tilting pad and fixed geometry journal bearing dynamic coefficients – A review. Shock and Vibration. 2009, 16(1), pp. 13–43.
  • 10. Dzida, M., Girtler, J., Dzida, S.: On the possible increasing of efficiency of ship power plant with the system combined of marine Diesel engine, gas turbine and steam turbine in case of main engine cooperation with the gas turbine fed in series and the steam turbine. Polish Maritime Research. 2009, 16(3), pp. 26–31.
  • 11. Jin, J., Wang, Z., Cao, L.: Numerical analysis on the influence of the twisted blade on the aerodynamic performance of thrbine. 2016, 23, pp. 86–90.
  • 12. Kiciński, J.: Dynamics of rotors and slide bearings (in Polish). Gdańsk: IMP PAN, Maszyny Przepływowe 2005.
  • 13. Kiciński, J., Żywica, G.: Steam Microturbines in Distributed Cogeneration. Springer monograph 2014.
  • 14. Kowalczyk, T., Głuch, J., Ziółkowski, P.: Analysis of possible application of high-temperature nuclear reactors to contemporary large-output steam power plants on ships. Polish Maritime Research. 2016, 2(90), pp. 32–41.
  • 15. Kozanecki, Z., Kiciński, J., Żywica, G.: Numerical Model of the High Speed Rotors Supported on Variable Geometry Bearings. In IUTAM Bookseries. 2011, Vol. 1011, pp. 217–227.
  • 16. Litwin, W.: Influence of local bush wear on water lubricated sliding bearing load carrying capacity. Tribology International. 2016, 103, pp. 352–358.
  • 17. Litwin, W., Olszewski, A.: Water-lubricated sintered bronze journal bearings—theoretical and experimental research. Tribology Transactions. 2014, 57(1), pp. 114–122.
  • 18. Paszota, Z.: Losses and energy efficiency of drive motors and systems. Replacement of the Sankey diagram of power decrease in the direction of power flow by a diagram of power increase opposite to the direction of power flow opens a new perspective of research of driv. 2013, 20(1), pp. 3–10.
  • 19. Qiu, Z.L., Tieu, A.K.: Identification of sixteen force coefficients of two journal bearings from impulse responses. Wear. 1997, 212(2), pp. 206–212.
  • 20. Rao, K.R., Kim, D.N., Hwang, J.J.: Fast Fourier Transform - Algorithms and Applications. (Springer, Ed.). Dordrecht 2010.
  • 21. Tiwari, R., Lees, A.W., Friswell, M.I.: Identification of dynamic bearing parameters: a review. The Shock and Vibration Digest. 2004, 36(2), pp. 99–124.
  • 22. Yari, E., Ghassemi, H.: Boundary element method applied to added mass coefficient calculation of the skewed marine propellers. 2016, 23(2), pp. 25–31.
  • 23. Zywica, G., Kicinski, J., Baginski, P.: The static and dynamic numerical analysis of the foil bearing structure. Journal of Vibrational Engineering and Technologies. 2016, 4(3), pp. 213–220.
Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
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Identyfikator YADDA
bwmeta1.element.baztech-1eefbdb6-e5d9-4461-9af3-aac3d5d3189a
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