Journal of Applied Mechanical Engineering

Lie KN

Publications

• Research Article
  A Numerical Analysis of Optimum Air Journal Bearings
  Author(s): Lie KN and Jerry C T SuLie KN and Jerry C T Su
  
  The responses to changes of bearing length-to-diameter ratio and supply pressure of hybrid air journal bearings are investigated numerically for rotor dynamic instability. Different types of external pressure compensations, including multi-array of 1, 2, 3, 4, or 5-row orifice bearings and porous bearings, are analyzed to obtain more insight to optimum designs of journal bearings to improve the problem of whirl instability of rotor mass. The results show that the long porous bearings (L/D>1.0) in the higher rotation speeds (Λ>0.5) have higher threshold load capacities W before the onset of whirl instability and thus are more stable than orifice bearings. On the contrary, the short 5-row orifice bearings (L/D ≤ 1.0) are more stable than the porous bearing in the lower rotation speeds (0.1 ≤ Λ ≤ 0.5). The re.. View More»
  DOI: 10.4172/2168-9873.1000122

  Abstract PDF