Coupling mechanism analysis between shaft whirling and transient oil film force of journal bearings under dynamical load

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 158-164.

LI Qiang1，ZHANG Shuo1，WANG Yujun1，XU Weiwei2，WANG Zhenbo1

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Abstract

Transient oil film force is the main damping source of a rotor-bearing system, and also an important reason for instability.Firstly, a new structured dynamic mesh method was presented for mesh updating.Based on this method, a CFD model for nonlinear transient oil film force under dynamical load was established.The cavitation was described by the "full cavitation model".Then the coupling mechanism between shaft whirling and transient oil film force was analyzed for circular and multi-wedge journal bearings.Results indicate that the deviation between the calculated results of the static equilibrium position and the experimental results is less than 2.5%.Under the support of nonlinear oil film force, the dynamic load has an obvious influence on the stability of the rotor.When the dynamic load is small, the oil tank seriously weakens the radial and tangential oil film force in the shaft whirling process.With the increase of dynamic load, the influence of the oil wedge decreases, the radial and tangential oil film force increase gradually, and the half speed whirling can be suppressed.For multi-wedge bearings, the influence of the oil tank is relatively small, so the oil film force can provide enough stiffness and damping to maintain stability.

Key words

journal bearing / rotor whirling / transient oil film force / dynamic mesh method / computational fluid dynamics(CFD)

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LI Qiang1，ZHANG Shuo1，WANG Yujun1，XU Weiwei2，WANG Zhenbo1. Coupling mechanism analysis between shaft whirling and transient oil film force of journal bearings under dynamical load[J]. Journal of Vibration and Shock, 2019, 38(24): 158-164

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