Study on the influence of thrust plate tilt on performance of distributed hybrid thrust bearing with tilting pad

Abstract

A kind of distributed hybrid thrust bearing with tilting pad is proposed in this paper, and the influence of thrust plate tilt on bearing performance is analyzed. The film thickness equation is constructed, considering the machining error and installation error synthetically which are the main causes of thrust plate tilt. Substituting the film thickness equation to the classical calculation equation of thrust bearing, the time-varying stiffness of the bearing is obtained. The influence of tilt angle of thrust plate on time-varying stiffness of the bearing is analyzed through the case bearing, and the bearing performance is controlled by change pivot position of tilting pad which is represented by preload coefficient. The results show that the thrust plate tilt causes the fluctuation of the bearing stiffness during the rotation period, and this fluctuation is exacerbated as the increasing of the tilt angle. The bearing stiffness increases and the tilt angle range of the thrust plate decreases accordingly, because that the increasing of the preload coefficient of tilting pad makes the bearing unilateral gap decrease. However, the large preload coefficient exacerbates the adverse effect of thrust plate tilt on the bearing, so the preload coefficient of the tilting pad needs to be adjusted reasonably. The research in this paper can provide a theoretical reference for the optimization of the tilt angle of the thrust plate and provide data support for the engineering application of distributed hybrid thrust bearing with tilting pad. KeywordsHybrid thrust bearing • Thrust plate tilt • Tilting pad • Time-varying stiffness * Runlin Chen

The effect of misalignment on the performance of tilting pad thrust bearing with TEHD coupling model and turbulence model

“…7 As the misalignment angle increased, the thrust plate tilt caused a fluctuation of the bearing stiffness during the rotation period, which was exacerbated by an increase in the tilt angle. 8 For self-equalizing TPTBs, Gokaltun and DeCamillo 9 developed a finite element analysis (FEA) model to represent the interaction between the thrust bearing components under the influence of a misaligned rotor and suggested that the leveling mechanism worked more effectively at higher loads; Koosha and San Andrés 10 performed a comprehensive multiple-pad analysis to evaluate the performance of self-equalizing TPTBs accurately, and found that an ideal self-equalizing TPTB (without friction at the contacts) operated with larger minimum fluid film thickness and lower peak film pressure compared to those obtained in a non-equalizing bearing.…”

Study on test method and experiment of dynamic characteristics of hydrostatic bearing

“…The dynamic characteristics of the bearing have a great influence on the dynamic behavior of the rotor system. The dynamic characteristics coefficients can be obtained by theoretical calculation [3]. However, the theoretical calculation formula of the dynamic characteristics coefficients of hydrostatic bearing stiffness is the approximate formula [4], which deviates the actual operating state.…”

Performance analysis of tilting pad thrust bearing incorporating the surface roughness, texture and turbulence effect

“…Badawi et al 6 studied the influence of the tilting pads number and the pads gap on the performance of tilting pad journal bearings, the results show that with the decrease of the pad gap, the bearing capacity increase. Chen et al 7 proposed a tilting pad distributed hybrid thrust bearing, and showed that with the increase of the preload coefficient of the tilting pad, the stiffness of the thrust bearing gradually increased, when the preload coefficient reached a certain value, the performance of the thrust bearing will decrease.…”