Dynamic characteristics of a rubimpact rotorbearing system for hydraulic generating set under unbalanced magnetic pull
 Leike Zhang,
 Zhenyue Ma,
 Bingwei Song
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Electromagnetic and mechanical forces are main reasons resulting in vibrations in hydraulic generating set. The nonsymmetric airgap between the rotor and stator creates an attraction force called unbalanced magnetic pull (UMP). The UMP can produce large oscillations which will be dangerous to the machines. In this paper, the nonlinear dynamic characteristics of a rotorbearing system with rubimpact for hydraulic generating set under the UMP are studied. The rubbing model is established based on the classic impact theory. Through the numerical calculation, the excitation current, mass eccentricity, stiffness of shaft and radial stiffness of stator are used as control parameters to investigate their effect on the system, by means of bifurcation diagrams, Poincaré maps, trajectories and frequency spectrums. Various nonlinear phenomena including periodic, quasiperiodic and chaotic motions are observed. The results reveal that the UMP has significant influence in the response of the rotor system that the continuous increase in the excitation current induces the alternation of quasiperiodic and chaotic motions, the cooccurrence of oil whip and rub in a wide excitation range aggravates the vibration and leads to the instability of the system. In addition, the large eccentricity and radial stiffness of stator, as well as the small stiffness of shaft may lead to the occurrence of full annular rubbing while increasing the stiffness of the shaft can play an important role of suppressing the chaotic motion, reducing the vibration and improving stability of the system.
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 Title
 Dynamic characteristics of a rubimpact rotorbearing system for hydraulic generating set under unbalanced magnetic pull
 Journal

Archive of Applied Mechanics
Volume 83, Issue 6 , pp 817830
 Cover Date
 20130601
 DOI
 10.1007/s0041901207190
 Print ISSN
 09391533
 Online ISSN
 14320681
 Publisher
 SpringerVerlag
 Additional Links
 Topics
 Keywords

 Hydraulic generating set
 Rotorbearing system
 Rubimpact
 Unbalanced magnetic pull
 Nonlinear dynamics
 Industry Sectors
 Authors

 Leike Zhang ^{(1)}
 Zhenyue Ma ^{(1)}
 Bingwei Song ^{(2)}
 Author Affiliations

 1. Faculty of Infrastructure Engineering, School of Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China
 2. Institute of Foundation Engineering, Water Conservancy and Hydropower Science Research Institute of Liaoning Province, Shenyang, 110003, Liaoning, China