Modelling approach of hybrid air herringbone grooved journal bearing considering the angular misalignment and centrifugal expansion

Abstract

Performance improvements can be achieved after introducing herringbone grooves into conventional plain aerostatic bearings at high speeds. However, the existing literature lacks a comprehensive model that accurately calculates the static and dynamic characteristics of this hybrid air bearing. To address this gap, this paper proposes a modeling method for high-speed hybrid air journal bearings with herringbone grooves, considering the effects of angular misalignment and centrifugal expansion. Based on the established model, effect of the grooves on the bearing performances is systematically studied. Furthermore, influences of the bearing angular misalignment and the rotor centrifugal expansion on the rotor’s vibration characteristics are illustrated through an unbalance response analysis for an industrial air spindle. The presented model provides an analysis tool for structure design and performance study of the herringbone grooved hybrid air journal bearings.