20-12-2012, 12:24 PM
A Presentation on Analysis of JOURNAL BEARING using Electro-rheological fluids
A Presentation on Analysis.pptx (Size: 601.59 KB / Downloads: 84)
INTRODUCTION
a bearing is a member which supports an applied load
also, permits relative motion b/w two members.A Journal bearing is a hollow cylinder, surrounds shaft, filled with fluid lube.
Electro-Rheological fluid
ER fluid is made by dielectric particle suspended into non-conducting fluid.
Devices which use ER fluid can provide simple, quiet, rapid-response interface between electronic and mechanical systems.
ER fluid uses : vibration clutch, brake, damper and vehicle suspension system.
Most significant use of controllable fluid on Tribology : journal bearing using ER fluid
HISTORICAL BACKGROUND
ER fluid and Theoretical Developments
Winslow (1947), “Method and means for translating electric impulse into mechanical force ”.
Dulikravich and Lynn (1996), “Unified Electro-Magneto-Fluid Dynamics (EMFD): Introductory concept”.
Way and Conrad (1998), “Analysis of ER fluid damper using Herschel-Bulkley model ”.
Park and Choi (1999), “Experimental investigation on material properties of an ER fluid subjected to temperature variation”.
Application of ER fluid
Sulman and Gordkin (1981), “The Electro-rheological effect and its possible uses”.
Jung and Choi (1995), “Effect of ER fluid on the damping capability of the damper”.
Mannings and Petrie (2000), “Active vibration control of journal bearing using ER fluid”.
Fisch (2003), “Development of an ER fluid actuator for vehicular instrumental control”.
Application of ER fluid on Journal Bearing
Tichy (1991), “Hydrodynamic lubrication theory for Bingham plastic fluid”.
Wu and Sun (1995), “Finite element analysis of journal bearing using bilinear rheological model”.
Nilolaskopoulos and Papadopoulos (1996,1998), “Experimental investigation of a high speed journal bearings lubricated with ER fluid”.
Peng and Zhu (2005), “Numerical analysis (on CFD) of the hydrodynamic characteristics of ER fluid flow in journal bearing ”.
CONCLUSIONS
Significant improvement in load carrying capacity but up to certain eccentricity ratio.
Friction variable is higher for all eccentricity ratio as compare to Newtonian fluid.
ER fluid provide higher side leakage for all eccentricity ratio.
ER fluid gives a better stability characteristics than Newtonian fluid for all eccentricity ratio.