Theoretical and experimental analysis of MR valve

Abstract

The properties of magnetorheological (MR) fluid can be rapidly varied by the application of amagnetic field. This behaviour allows the designer to construct a machine that's quality can bechanged in action, according to the variation of the surround and to the expectations. Thecommercial use of MR fluid is already not limited in dampers and breaks. Thanks to the advantageousquality ? that requires low voltage ? is on the increase. Using the MR fluid in a valve, thepressure drop can be adjusted by the intensity of the magnetic field, without moving parts. In thiswork a MR valve has been designed, that can supply a hydrostatic bearing lubricated with magneticfluid. Its behaviour has been simulated with three models. The analytical model based on the Binghamlaw of the magnetic fluid flow, the Buckingham model (Bingham modified) and the dimensional modelsuggested by Lord Corporation, the manufacturer of used MR fluid, MRF 122 2EG. The results of thesimulations are compared with the experimental data.