Coupled bending-torsional vibration analysis for rotor-bearing system with rub-impact of hydraulic generating set under both dynamic and static eccentric electromagnetic excitation

Jinjian Zhang, Leike Zhang, Zhenyue Ma, Xueni Wang, Qianqian Wu and Zhe Fan

Chaos, Solitons & Fractals, 2021, vol. 147, issue C

Abstract: Modern industrial requirements are continuously demanding better performance, smaller clearance, higher rotational speed and higher load from hydraulic generating set, under this circumstance, vibration mitigation is of considerable importance for safe and efficient functioning of rotor-bearing system. The overall goal of this research is to reveal the mechanism for unexpected nonlinear vibration induced by combined action of machine and charge load from hydraulic generating set. At first, a coupled bending-torsional rotor-bearing system with rub-impact under electromagnetic excitation for hydraulic generating set is established, meanwhile, a general model of unbalanced magnetic pull, considering both dynamic and static eccentricities between stator and rotor, is introduced to the system, and corresponding equations of motion are obtained according to Lagrange equation. Secondly, the effects from excitation current, mass eccentricity, radial stiffness of stator, dynamic and static eccentricities on vibration response of system are investigated thoroughly, by means of numerical method. And nonlinear dynamic behavior of system is illustrated through bifurcation diagrams, Poincaré maps, trajectories, time domains and frequency spectrums. Finally, comparisons that with and without mixed eccentricities is conducted in term of nonlinear performance, disclosing that dynamic characteristic of system changes dramatically when composited eccentricities are taken into account. The analysis contributes to a deep understanding of complex nonlinear dynamic phenomena with benefit for forecasting and diagnosing system vibration due to electromechanical excitation in hydraulic generating rotor system.

Keywords: Hydraulic generating set; Electromagnetic excitation; Rub-impact; Coupled bending-torsional vibration; Dynamic and static eccentricities (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960077921003143
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:147:y:2021:i:c:s0960077921003143

DOI: 10.1016/j.chaos.2021.110960

Access Statistics for this article

Chaos, Solitons & Fractals is currently edited by Stefano Boccaletti and Stelios Bekiros

More articles in Chaos, Solitons & Fractals from Elsevier
Bibliographic data for series maintained by Thayer, Thomas R. ().