Vibration suppression of rubbing system in water turbine generator set based on MRD optimization arrangement

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 1-11.

ZHANG Leike1, NIE Liang1, ZHANG Jinjian2,3, WANG Xueni1,4, MA Zhenyue2

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Abstract

Aiming at the rotor-runner system with rubbing problem of hydro-generator set, the Magneto-Rheological Fluid Damper ( MRD ) is adopted to control the shaft vibration, in order to investigate the influence of MRD on vibration pattern of unit shaft system and corresponding effect on suppression of system rubbing faults. Firstly, the unit axial position function is introduced into MRD nonlinear dynamics model, and the dynamic model of MRD-rotor-runner system with axial distribution parameter under rubbing fault is established. Secondly, based on numerical simulation method, the nonlinear dynamic behavior of rotor-runner system with or without considering MRD is comparatively analyzed using unit speed as control parameter. Finally, the effects of different MRD axial arrangement parameters on the dynamic behavior of rubbing rotor-runner system are investigated. The results show that the addition of MRD has a good restraining effect on unsteady motion of rotor and runner, which can significantly reduce vibration amplitude of rotor and runner, and effectively avoid the occurrence of rubbing faults in unit shaft system. The vibration dampening effect of MRD on the system is the best when damping parameters s1 and s2 are taken to be 0.25 and 0.95, respectively. By reasonably arranging MRD in unit shaft system, the system vibration can be effectively improved, thus providing useful guidance for vibration control of hydro-generator set.

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hydrogenerator set / rotor-runner system / rub-impact / magneto-rheological fluid damper / optimized vibration control

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ZHANG Leike1, NIE Liang1, ZHANG Jinjian2,3, WANG Xueni1,4, MA Zhenyue2. Vibration suppression of rubbing system in water turbine generator set based on MRD optimization arrangement[J]. Journal of Vibration and Shock, 2024, 43(13): 1-11

References

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