In Beom Lee

Identification of the axial thrust load during the operating conditions of a turbocharger provides useful information to turbocharger designers. The axial force acting on the thrust bearing is mainly caused by the imbalance between the turbine wheel and the compressor wheel. It has a significant influence on the friction losses, which reduce the efficiency and the performance of a high-speed turbocharger. Well-known formulae for calculating the thrust load and the mechanical friction have been g

In this paper, the effect of oil conditions in rotor dynamic behaviors of a FFRB (Fully-Floating Ring Bearing) is investigated. Through the characteristic of a FFRB has two films, it has several advantages such as less friction loss and better stability over a wide speed range. However, it is difficult to supply a oil to the inner film. Thus, turbocharger makers have been paid significant attention to the lubrication of a FFRB because of its importance. This work focuses on the influence of oil

Recently, developments of process monitoring system in order to detect and diagnose process abnormali-ties has got the spotlight in process systems engineering. Normal data obtained from processes provide available infor-mation of process characteristics to be used for modeling, monitoring, and control. Since modern chemical andenvironmental processes have high dimensionality, strong correlation, severe dynamics and nonlinearity, it is not easy toanalyze a process through model-based approach. T