Abstract
The work presented in this paper aims to study the performance of a two‐lobe hole‐entry hybrid journal bearing system compensated by orifice restrictors. The Reynolds equation governing the flow of lubricant in the clearance space between the journal and bearing together with the equation of flow through an orifice restrictor has been solved using FEM and Galerkin′s method. The bearing performance characteristics results have been simulated for an orifice compensated nonrecessed two‐lobe hole‐entry hybrid journal bearing symmetric configuration for the various values of offset factor (δ), restrictor design parameter , and the value of external load . Further, a comparative study of the performance of a two‐lobe hole‐entry hybrid journal bearing system with a circular hole‐entry symmetric hybrid journal bearing system has also been carried out so that a designer has a better flexibility in choosing a suitable bearing configuration. The simulated numerical results indicate that for the two‐lobe symmetric hole‐entry hybrid journal bearing system with an offset factor (δ) greater than one provides 30 to 50 percent larger values of direct stiffness and direct damping coefficients as compared to a circular symmetric hole‐entry hybrid journal bearing system.
Highlights
Hybrid journal bearings are extensively used in machine tools under conditions of heavy loads and higher speeds
Multilobe hydrodynamic journal bearings have been investigated for their antiwhril characteristics by many researchers [1,2,3,4,5]
The notable observation about these studies is that they are all concerned with hydrodynamic journal bearing systems
Summary
Hybrid journal bearings are extensively used in machine tools under conditions of heavy loads and higher speeds. Ghosh and Satish [7], using a small amplitude perturbation analysis, determined the rotordynamic coefficients of a multilobe hybrid journal bearing system having large recesses. They extended their work further [8] to study the stability of a rigid rotor supported on a multilobe hybrid journal bearing system with short sills following a linear vibration theory for small amplitude oscillations of the journal center about its steady-state position. It was observed that a multilobe recessed hybrid journal bearing system with an offset factor more than one exhibits better dynamic performance than the circular hybrid journal bearings.
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