Study on the influence of sliding bearing stiffness on the dynamic response of hydro-generator shaft

• Autorzy: Ri Y. , Ryang S. , Ryong G.

Identyfikatory

DOI

10.59441/ijame/207141

• Języki publikacji: EN

Abstrakty

EN

The dynamic modeling of the main shaft system of a hydro turbine generator is carried out by considering the combined effects of unbalanced mass force, magnetic pull force, hydrodynamic force and oil film force of the sliding bearing, its critical rotational speed is obtained, the effect of the sliding bearing stiffness at each journal on the critical rotational speed of the whole shaft system is evaluated, and the method is proposed to improve the stability of the hydro turbine generator by changing it, and the validity is demonstrated by the field test results.

Słowa kluczowe

EN

hydro-turbine generator; dynamic modeling; critical rotational speed; sliding bearing stiffness

PL

generator turbiny wodnej; modelowanie dynamiczne; prędkość obrotowa; łożysko ślizgowe

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2025
• Tom: Vol. 30, no. 3
• Strony: 128--141
• Opis fizyczny: Bibliogr. 14 poz.,

Twórcy

autor

Ri Y.

• Umjong, Institute of Mechanic, KOREA (NORTH)

• https://orcid.org/0009-0007-0373-9790

autor

Ryang S.

• Umjong, Institute of Mechanic, KOREA (NORTH)

autor

Ryong G.

• Umjong, Institute of Mechanic, KOREA (NORTH)

Bibliografia

• [1] Sheng X., Li B., Wu Z. and Li H. (2014): Calculation of ball bearing speed-varying stiffness.– Mechanism and Machine Theory, vol.81, pp.166-180.
• [2] Li J. and Chen Q. (2014): Nonlinear dynamical analysis of hydraulic turbine governing systems with nonelastic water hammer effect.– Journal of Applied Mathematics, ArticleID 412578, p.11, https://doi.org/10.1155/2014/412578.
• [3] Gustavsson R. and Aidanpää J.-O. (2006): The influence of nonlinear magnetic pull on hydropower generator rotors.– Journal of Sound and Vibration, vol.297, No.3, pp.551-562.
• [4] Wu W., Pang J., Liu X., Zhao W., Lu Z., Yan D., Zhou L. and Wang Z. (2023): Effect of unbalanced magnetic pull of generator rotor on the dynamic characteristics of a pump-turbine rotor system.– Water, vol.15, No.6, p.1120, https://doi.org/10.3390/w15061120.
• [5] Toliyat H.A., Nandi S., Choi S. and Meshgin-Kelk H. (2013): Electric Machines Modeling, Condition Monitoring, and Fault Diagnosis.– CRC Press, Taylor & Francis, p.227.
• [6] Li Q., Zhang S., Ma L., Xu W. and Zheng S. (2017): Stiffness and damping coefficients for journal bearing using the 3D transient flow calculation.– Journal of Mechanical Science and Technology, vol.31, No.5, pp.2083-2091, https://doi.org/10.1007/s12206-017-0405-9.
• [7] Zhang X., Yin Z. and Gao G. (2015): Determination of stiffness coefficients of hydrodynamic water-lubricated plain journal bearing.– Tribology International, vol.85, pp.37-47, https://doi.org/10.1016/j.triboint.2014.12.019.
• [8] Alves V.C.A., Alves D.S. and Machado T.H. (2022): Linear and nonlinear performance analysis of hydrodynamic journal bearings with different geometries.– Appl. Sci., vol.12, No.7, p.3215, https://doi.org/10.3390/app12073215.
• [9] Ling F.F. (2005): Dynamics of Rotating Systems.– Mechanical Engineering Series, pp.298-315.
• [10] Keyun Z., Gao Ch., Li Z., Yan D. and Fu X. (2018): Dynamic analyses of the hydro-turbine generator shafting system considering the hydraulic instability.– Energies, vol.11, No.10, p.2862, https://doi.org/10.3390/en11102862.
• [11] Rebelein C., Vlacil J. and Zaeh M.F. (2017): Modeling of dynamic behavior of machine tools; influence of damping, friction, control and motion.– Prod. Eng. Res. and Develop., vol.11, pp.61-71, DOI:10.1007/s11740-016-0704-5.
• [12] Wang W., Shang Y. and Yao S. (2022): A predictive analysis method of shafting vibration for the hydraulic-turbine generator unit.– Water, vol.14, No.17, p.2714, https://doi.org/10.3390/w14172714.
• [13] Bai B., Zhang L.X. and Zhao L. (2012): Influences of the guide bearing stiffness on the critical speed of rotation in the main shaft system.– IOP Conference Series: Earth and Environmental Science, vol.15, No.7, p.072028, IOP Publishing, https://doi.org/10.1018/1755-1315/15/7/072028.
• [14] Pal T.K., Ray A., Chowdhury S.N. and Ghosh D. (2023): Extreme rotational events in a forced-damped nonlinear pendulum.– Chaos: An Interdisciplinary Journal of Nonlinear Science, vol.33, No.6, p.10, https://doi.org/10.48550/arXiv.2304.00039.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)