caa a22 4500 445811668 CHVBK 20180317145213.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00419-010-0453-4 doi (NATIONALLICENCE)springer-10.1007/s00419-010-0453-4 Vibration characteristics of a hydraulic generator unit rotor system with parallel misalignment and rub-impact [Elektronische Daten] [Zhiwei Huang, Jianzhong Zhou, Mengqi Yang, Yongchuan Zhang] The object of this research aims at the hydraulic generator unit rotor system. According to fault problems of the generator rotor local rubbing caused by the parallel misalignment and mass eccentricity, a dynamic model for the rotor system coupled with misalignment and rub-impact is established. The dynamic behaviors of this system are investigated using numerical integral method, as the parallel misalignment, mass eccentricity and bearing stiffness vary. The nonlinear dynamic responses of the generator rotor and turbine rotor with coupling faults are analyzed by means of bifurcation diagrams, Poincaré maps, axis orbits, time histories and amplitude spectrum diagrams. Various nonlinear phenomena in the system, such as periodic, three-periodic and quasi-periodic motions, are studied with the change of the parallel misalignment. The results reveal that vibration characteristics of the rotor system with coupling faults are extremely complex and there are some low frequencies with large amplitude in the 0.3-0.4× components. As the increase in mass eccentricity, the interval of nonperiodic motions will be continuously moved forward. It suggests that the reduction in mass eccentricity or increase in bearing stiffness could preclude nonlinear vibration. These might provide some important theory references for safety operating and exact identification of the faults in rotating machinery. Springer-Verlag, 2010 Hydraulic generator unit nationallicence Rotor system nationallicence Parallel misalignment nationallicence Rub-impact nationallicence Nonlinear dynamic nationallicence Fault diagnosis nationallicence Huang Zhiwei College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut Zhou Jianzhong College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut Yang Mengqi College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut Zhang Yongchuan College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut Archive of Applied Mechanics Springer-Verlag 81/7(2011-07-01), 829-838 0939-1533 81:7<829 2011 81 419 https://doi.org/10.1007/s00419-010-0453-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00419-010-0453-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huang Zhiwei College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut NATIONALLICENCE 700 1- Zhou Jianzhong College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut NATIONALLICENCE 700 1- Yang Mengqi College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut NATIONALLICENCE 700 1- Zhang Yongchuan College of Hydraulic and Digitalization Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei Province, China aut NATIONALLICENCE 773 0- Archive of Applied Mechanics Springer-Verlag 81/7(2011-07-01), 829-838 0939-1533 81:7<829 2011 81 419 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer