Air ring bearings: Efficient modelling and case study for improved vibration behavior and enhanced rotor stability

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration Pub Date : 2024-11-15 DOI:10.1016/j.jsv.2024.118806

Pascal Zeise, Bernhard Schweizer

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引用次数: 0

Abstract

A main drawback of rigid air bearings is that these bearings can usually not be run above the linear threshold speed of instability, since rotor amplitudes become too large. Providing, however, additional external damping, rotors with air bearings may also be operated above the linear threshold speed of instability – i.e. in the whirl/whip regime – with technically harmless amplitudes.

While the bearing bushing of conventional air bearings is usually rigidly fixed to the housing, the bushing of the special bearing considered here – subsequently called air ring bearing – is visco-elastically supported in the housing in order to provide external damping. Alternatively, the bearing sleeve can also be mounted using a foil structure so that external dissipation is mainly produced by dry friction.

Here, a systematic sensitivity study concerning the influence of different bearing parameters – particularly bearing clearances, ring supporting stiffness and damping/friction – on the stability of rotor systems with air ring bearings is presented. For the analysis, a transient nonlinear rotor/bearing model is used. It is shown that by an appropriate choice of the system parameters, the amplitudes in the whirl/whip region will remain moderate so that the rotor system may securely be operated above the linear stability limit.

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来源期刊

Journal of Sound and Vibration 工程技术-工程：机械

CiteScore

9.10

自引率

10.60%

发文量

551

审稿时长

69 days

期刊介绍： The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.