Dynamic characteristics analysis of elliptical bearing-rotor coupling system#br#

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 174-179.

LI Qiang1, MA Long1, XU Wei-wei2, ZHENG Shui-ying3

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Abstract

In order to reveal the lubrication characteristics of elliptical bearing and the nonlinear dynamic behaviors of rotor-bearing system, the unsteady flow field was calculated by employing a new mesh movement approach based on structured grid. A quasi-coupling calculation between the oil film in journal bearing and rotor dynamic was realized by transferring data between two domains. An analysis had been carried out to uncover the transient operation process of journal bearings of different structure through its inner lubrication flow field. Through the separate discussion and calculation of the influence on journal bearings' working performance resulted by speed, amount of unbalance and structural parameters, it has been found out that the effect of the tip clearance on the stability is larger than the side clearance; the whirling center of the journal relates not to the rotation speed but also to the dynamic load, with the increase of the amount of unbalance, the whirling center gets close to the coordinate origin, which results in a decrease in stability margin. It provides the basis to analysis the dynamic characteristics of elliptical bearing and stability of rotor-bearing system.

Key words

elliptical bearing / computational fluid dynamic (CFD) / rotor-bearing system / dynamic mesh / stability

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LI Qiang1,MA Long1,XU Wei-wei2, ZHENG Shui-ying3. Dynamic characteristics analysis of elliptical bearing-rotor coupling system#br#[J]. Journal of Vibration and Shock, 2016, 35(11): 174-179

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