Nonlinear dynamic analysis of a tilting pad journal bearing subjected to pad fluttering

Łożyska Hydrodynamiczne Promieniowe Oraz Nieliniowe Zjawiska Drgań W Łożyskach Z Panewkami Wahliwymi

“…The typical bearing design for the second group is the titling pad journal bearing. Although it can suppress undesirable phenomena connected mainly with the fixed geometry bearing, this kind of bearing can be a source of another type of instabilities called pad fluttering and spragging [10].…”

“…The pressure generated close to the pad's leading edge then forces the journal out of its current position, leading to a realignment of the TPJB. This phenomenon is called spragging [10,12]. Spragging is characteristic by spontaneous changes of the journal and/or pad positions due to rapid changes in the pressure field.…”

“…Spragging is characteristic by spontaneous changes of the journal and/or pad positions due to rapid changes in the pressure field. Continuous, often unstable vibration of the pad is termed pad fluttering [10,14].…”

“…Computational modelling of tilting pad journal bearing is a complex problem involving the modelling of hydrodynamic lubrication and sufficient description of the pads' motion [10]. The planar lateral motion of the pad without axial misalignment is supposed.…”

“…Above stated computational model [10] and typical phenomena related to the tilting pad journal bearing are demonstrated on the nonlinear steady-state response to harmonic excitation of four-segment TPJB. This configuration of TPJB has two upper pads which are almost unloaded during operation, and thus they might be susceptible to pad fluttering.…”