Complex double-mass dynamic model of rotor on thrust foil gas dynamic bearings

Abstract

Abstract. The present paper considers simulation of a rotor's dynamics behaviour on thrust foil gas dynamic bearings based on simultaneous solution of gas dynamics differential equations, equations of theory of elasticity, motion equations and some additional equations. A double-mass dynamic system was considered during the rotor's motion simulation which allows not only evaluation of rotor's dynamic behaviour, but also to evaluate the influence of operational and load parameters on the dynamics of the rotor-bearing system.

Performance improvement of foil air journal bearing employing micro-pocket and textures on top compliant surface

“…Moreover, the major drawbacks of these air bearings are their low load sustaining capability, poor stiffness, low damping, high values of friction and wear during starting and stopping of the journal. In the past, attempts have been made by investigators to enhance the performance behaviors of foil bearings by employing various techniques such as different geometrical designs of bump, materials of bump, geometry and material of top foil, and coatings on top foil [9][10][11][12][13][14][15][16][17]. Moreover, it is worth noting here that in the recent past, surface textures have emerged as viable technology employing which attempts are being made to improve the frictional and vibrational performances of various incompressible oil lubricated tribo-pairs [18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”