Effect of the ER lubricant behaviour on the performance of spherical recessed hydrostatic thrust bearing

A comparative performance assessment of hydrostatic thrust bearings operating with electrorheological lubricant

“…The higher values of potential difference should be avoided as it may lead to ionization of surrounding air (Aoyama and Inasaki, 1997). Also, higher potential difference may contribute toward very high frictional power loss (Agrawal and Sharma, 2021) in fluid film bearing because of increase in apparent viscosity of ER lubricant. In terms of damping parameters, the circular and square pockets, which are compensated with CFV outperform other pockets operating with capillary and orifice compensation.…”

“…An electric field (E) is applied across fluid-film thickness direction. The generalized nondimensional form of Reynold’s equation is expressed as follows (Agrawal and Sharma, 2021): where, trueF¯0=∫011trueμ¯dz¯; trueF¯1=∫01truez¯ trueμ¯dz¯; trueF¯2=∫01truez¯ trueμ¯false(z¯−trueF¯1trueF¯0false)dz¯; are the viscosity integrals across film thickness. The flow of the ER fluid was theoretically described using the continuous Bingham model.…”

“…The ER fluid was modelled using Cason fluid and effect of inertia forces are examined on the pressure distribution using the average inertia method. Some theoretical and experimental studies have reported the use of an ER lubricant in hydrodynamic journal bearings (Peng and Zhu, 2005; Christidi-Loumpasefski et al , 2018), spherical hydrostatic bearing (Agrawal and Sharma, 2021) and ER dampers (Abed et al , 2017; Tan et al , 2021). The use of ER valve restrictor (Abed et al , 2017) in squeeze film dampers was reported useful to control rotor vibrations and force transmissibility when bearing is operating near to the critical speeds.…”

Electrorheological Fluids of GO/Graphene-Based Nanoplates

“…When the electric field is withdrawn, ER fluids return to the original Newtonian fluid state. This rapid, reversible, and continuously adjustable rheology transition characteristic makes ER fluids have potentially wide applications as shock absorbing devices [ 25 , 26 ], smart polishing [ 27 , 28 ], smart lubrication [ 29 , 30 ], microfluid control [ 31 , 32 ], robotics [ 33 , 34 ], and medical equipment [ 35 , 36 ].…”

Hydrostatic Bearing Characteristics Investigation of a Spherical Piston Pair with an Annular Orifice Damper in Spherical Pump

“…The hydrostatic bearing consists of a fluid layer between two surfaces, whose purpose is to avoid direct surface-to-surface contact [1][2][3][4][5][6]. Generally, hydrostatic bearings are utilized in heavy equipment, to carry large loads between two surfaces that are moving relative to each other at a low speed [4].…”