Steady-state characteristics of a dual-rotor system with intershaft bearing subjected to mass unbalance and base motions

Xi Chen, Mingfu Liao

科研成果: 书/报告/会议事项章节会议稿件同行评审

10 引用 (Scopus)

摘要

A dual-rotor system with an intershaft bearing subjected to mass unbalance and base motions is established. Using Lagrange's principle, equations of motion for dual-rotor system relative to moving base are derived. Rotary inertia, gyroscopic inertia, transverse shear deformation, mass unbalance, and six components of deterministic base motions are taken into account. Using state-space vector, steady-state characteristics of dual-rotor system are analyzed through dual-rotor critical speed map, mode shapes, unbalance responses considering base rotations, frequency responses due to base motions, and shaft orbits. The results show that base translations just add external force vectors, while base rotations bring on parametric system matrices and additional force vectors. Base rotations not only change natural frequencies of dual-rotor system, but also break the symmetry of dynamic characteristics in the case of base lateral rotation. Excited by base harmonic translation, resonant frequencies correspond to whirl frequencies. The orbit remains circular under base axial rotation, while it becomes elliptical with a static offset under lateral rotation and then a complicated curve due to harmonic translation. When harmonic frequency of base translation gets close to dual-rotor excitation frequencies, obvious beat vibration appears. Overrall, this flexible approach can ensure calculation accuracy with high efficiency and good expandability.

源语言英语
主期刊名Structures and Dynamics
出版商American Society of Mechanical Engineers (ASME)
ISBN(印刷版)9780791851135
DOI
出版状态已出版 - 2018
活动ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, 挪威
期限: 11 6月 201815 6月 2018

出版系列

姓名Proceedings of the ASME Turbo Expo
7A-2018

会议

会议ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
国家/地区挪威
Oslo
时期11/06/1815/06/18

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