Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Dynamic coefficients


The Dynamic Coefficients and Elastic Deformation with Thermal Effect For Cylindrical Pivot Tilting 5-Pad Bearing

Muhannad Z. Khelifa

Engineering and Technology Journal, 2009, Volume 27, Issue 15, Pages 2760-2774

The paper describes the results of theoretical study of the tilting pad bearing consist of five pads each pad can be titling 0.2o about a cylindrical pivot at high speed of rotating journal. The total oil film thickness includes elastic deformation with thermal effect had been estimated. By using finite element method to solve the Reynolds equation for dynamic load, from this solution generated pressure,
components of oil film forces and moments are expressed as functions of journal coordinates, dynamic coefficients (stiffness and damping coefficients) these coefficients of oil film can be determined by differentiation of the oil film force finally elastic deformation of pad surface was obtained. This paper also includes the study of many
parameters such as pivot offset, preload factor, direction of load (load on pad and load between load) and dynamic coefficients were presented as functions of Sommerfeld number. Results show that good bearing performance when the pad preload factor is increase and pivot offset decreases.

Load Line Direction and Bearing Length Effects on The Tilting 4-Pad Bearing Performance

Raad Hameed Majed

Engineering and Technology Journal, 2009, Volume 27, Issue 9, Pages 1691-1700

This paper presents the tilting 4-pad bearing performance under dynamic
load, the journal center velocity is calculated by mobility method. Finite element method
was used to solve the Reynolds equation in two dimensions from this solution the
pressure distribution can be obtained over pad surface. Study of the relationship of the
load line angle (b) with the pressure distribution changing due to the angular position
taking four angles 0o, 5 o,40 o and 80 o. Also the effects of many parameters were studied
such as length-diameter ratios, oil flow rates and finally dynamic coefficients (stiffness
and damping coefficients) of journal bearing. The results of this paper shows that the
load line angle (b) when equal 40o and length-diameter ratio (L/D=0.5), gives the beast
bearing performance.