Dynamic characteristics of compound textured journal bearing

Abstract

An investigation of the compound texture effect on the dynamic characteristics of the journal bearing film is conducted. In this work, eight dynamic coefficients of the compound textured journal bearing and critical speed of the rotor supported by textured bearings are obtained and compared. Meanwhile, the elastic deformation effect of the bearing and rotor is obtained using the continuous convolution fast Fourier transform (CC-FFT) method. It is found that the reasonably arranged compound texture brings out an obvious increment in the direct stiffness coefficients and damping coefficients compared with the simple one, which results in the high critical speed of the bearing-rotor system. The above changes are close to the texture distribution, second-layered texture length, and width-length ratios of the compound texture. Moreover, there exists a critical compound texture depth to improve the critical speed of the bearing-rotor system.

Influence of texture geometries on the performance parameters of hydrodynamic journal bearing

“…They also studied the effects of the Reynolds number and the square dimple parameters on the dynamic characteristics of the journal-bearing system. Recently, Meng et al 26 studied the effect of compound textures on the dynamic characteristics of the journal bearings. They demonstrated that a reasonably arranged compound texture improves the direct stiffness and damping coefficients in comparison to the simple texture, which in turn increases the critical speed of the bearing-rotor system.…”

Effects of Texture Bottom Profile on Static and Dynamic Characteristics of Journal Bearings

“…Similarly, the effects of triangular-shaped and chevron-shaped textures on the static, dynamic, and stability performances of journal bearings have been studied, and the optimal performance parameters have been found by researchers [29][30][31][32]. In addition, Meng et al [33] carried out a calculative investigation to study the effects of simple rectangular texture and compound texture on the dynamic performance of journal bearings and found that locally distributed compound texture can increase the direct stiffness coefficients, damping coefficients, and critical speed of journal bearing. Recently, Singh and Awasthi [34,35] numerically investigated the effects of texture parameters (texture depth and its distribution) on the static, dynamic, and stability performances of journal bearings with cylindrical, spherical, triangular, and kite textures; the results show that the performance parameters were significantly improved when the texture distribution is in the pressure rising region of bearings.…”

Effect of micro-grooved surface on the static and dynamic characteristics of journal bearings with misalignment

“…The direct stiffness coefficient K yy significantly changes due to the external load acts in the y direction, thence, the direct stiffness coefficient K yy is mainly analyzed as an index for the improvement of the dynamic characteristic of micro-grooved bearing. 51 Under the chosen value of the eccentricity ratio is 0.3, for the aligned journal bearing, the direct stiffness coefficients K yy of straight-groove, left spiral-groove, right spiral-groove, left herringbone-groove, and right herringbone-groove are increased by 29.99%, 28.10%, 28.42%, 63.01%, and 27.63%, respectively, compared with that of no-grooved journal bearing; for the misaligned journal bearing, the direct stiffness coefficients K yy of straight-groove, left spiral-groove, right spiral-groove, left herringbone-groove, and right herringbone-groove are increased by 18.06%, 12.98%, 23.43%, 17.42%, and 19.17%, respectively, compared with that of no-grooved journal bearing.…”