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论文类型：期刊论文

发表时间：2015-11-15

发表刊物：FINITE ELEMENTS IN ANALYSIS AND DESIGN

收录刊物：SCIE、EI、Scopus

卷号：106

页面范围：32-40

ISSN号：0168-874X

关键字：Centrifugal compressor; Geared rotor system; Changing load; Modeling; Vibration

摘要：The variable critical speeds and resonances of a geared parallel-rotor system with five shafts effected by changing oil bearing stiffness due to different external loads are investigated in this paper. The rotor system of a modern centrifugal compressor is taken as the research object firstly. A finite element (FE) model of it is established by using rotating beam elements with 6 degrees-of-freedom (D0Fs), and linear mesh stiffnesses of the engaged helical gears are involved. The changing stiffness and damping of the oil bearings effected by different loads are calculated based on traditional oil-film fluid formula. Then, the Campbell diagrams of the whole rotor system under different loads on three output shafts are calculated based on the above model. Finally, comparing the obtained critical speeds, the load ranges are revealed to lead possible resonances of the rotor system near the operating speeds. (C) 2015 Elsevier B.V. All rights reserved