Method for calculating stiffness and damping coefficients of hybrid bearings based on dynamic mesh model

被引：13

作者：

Xiong, Wanli ^{[1
]}

Hou, Zhiquan ^{[1
]}

Lü, Lang ^{[1
]}

Yang, Xuebing ^{[2
]}

Yuan, Julong ^{[3
]}

机构：

[1] National Research Center for High Efficiency Grinding, Hunan University

[2] Wind Power Subsidiary Co., Xiangtan Electric Manufacturing Group Co. Ltd.

[3] The Key Laboratory of Mechanical Manufacture and Automation of Ministry of Education, Zhejiang University of Technology

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2012年 / 48卷 / 23期

关键词：

Damping coefficients; Dynamic mesh; Hybrid journal bearing; Stiffness coefficients;

D O I：

10.3901/JME.2012.23.118

中图分类号：

学科分类号：

摘要：

For the reason that Reynolds equation is not suitable for reflecting nonlinear flow mechanics coupled by inertial effect of oil circumferential flow, squeeze effect of the journal, and diffusion effect of oil entry flow, the calculating accuracy of stiffness and damping coefficients can not satisfy optimal design of high speed bearings. A new approach of calculating stiffness and damping coefficients of journal bearings is developed based on Navier-Stokes equation. The changing oil film force, the displacement perturbation, the velocity perturbation and the rotating speed are achieved by using user definition function programs. The moving boundary of the journal caused by rotational movement is changed into static boundary for avoiding the grid distortion. The coordination of moving grid caused by displacement perturbation and velocity perturbation is updated by the spring smoothing theoretical model. Comparing oil film force under steady condition with those of transient processes, the value scope of displacement perturbation and velocity perturbation are defined. The stiffness and damping coefficients of a typical bearing are calculated by applying the approach combined with the perturbation theory, and the dynamic development process of oil film thickness and three-dimensional pressure distribution are achieved. Finally, an experiment is used to test the stiffness coefficients of the bearing based on the influence coefficient method, which are substantial in agreement with theoretical analysis. The results show that the numerical method is valid. ©2012 Journal of Mechanical Engineering.

引用

页码：118 / 126

页数：8

共 15 条

[1]

Xiong W., Lin H., Lu L., Et al., Research and development on key technology of motor built-in spindle supported by hydrodynamic and hydrostatic bearings for ultra-high speed grinding, (2011)

[2]

Lund J.W., The stability of an elastic rotor in journal bearing with flexible damped supports, ASME Journal of Applied Mechanics, 32, 4, pp. 911-920, (1965)

[3]

Ghosh M.K., Majumdar B.C., Rao J.S., Steady-state and dynamic behaviour of multi-recess hybrid oil journal bearing, Journal of Mechanical Engineering Science, 21, 5, pp. 345-351, (1979)

[4]

Rowe W.B., Chong F.S., Computation of dynamic force coefficients for hybrid (hydrostatic/hydrodynamic) journal bearings by the finite disturbance and perturbation techniques, Tribology International, 19, 5, pp. 260-271, (1986)

[5]

Xu S., Lu Y., Wan P., Analysis and experimental investigation of a hole-entry hybrid bearing, Chinese Journal of Mechanical Engineering, 29, 5, pp. 88-95, (1993)

[6]

Zheng T., Xu Q., New numerical method for calculating dynamic coefficients of oil-lubricated journal bearings, Chinese Journal of Mechanical Engineering, 32, 3, pp. 20-27, (1996)

[7]

Sawicki J.T., Rao T.V.V.L.N., A nonlinear model for prediction of dynamic coefficients in a hydrodynamic journal bearing, International Journal of Rotating Machinery, 10, 6, pp. 507-513, (2004)

[8]

Mori A., Makino T., Mori H., Entry flow and pressure jump in submerged multi-pad bearings and grooved bearings, Journal of Tribology, 114, 2, pp. 370-377, (1992)

[9]

Tucker P.G., Keogh P.S., On the dynamic thermal state in a hydrodynamic bearing with a whirling journal using CFD techniques, Journal of Tribology, 118, 2, pp. 356-363, (1996)

[10]

Sahlin F., Glavatskih S.B., Almquis T., Et al., Two dimensional CFD analysis of micro-patterned surfaces in hydrodynamic lubrication, Journal of Tribology, 127, 1, pp. 96-127, (2005)

← 1 2 →