Applications of Electro-/Magneto-Rheological Fluids to Vibration Control Systems

A Rheological Model for Magneto-rheological Fluids

Magneto-rheological fluids (MRF) are suspensions of particles which can be magnetized. MRF exhibit fast, strong and reversible changes in their rheological properties when a magnetic field is applied. A commercially available damping system that takes full advantage of the controllable technology of MRF and delivers valveless damping control appeared on passenger vehicles in 2003. Further comme...

Structure in magneto-rheological fluids: a theoretical analysis

The fundamental mechanism for magneto-rheological clutches, switches and devices is the ability of magnetic fields to induce relatively thick, linearly extended structures which span the relevant fluid medium. Recent observations have shown these to form via initial thin, linear, chain-like threads along the field lines, which then associate laterally via a diffusion-controlled process into the...

Nano-materials for Novel Magneto-Rheological Liquids and Nano-fluids

Electro-magneto-hydrodynamics Flows of Burgers' Fluids in Cylindrical Domains with Time Exponential Memory

This paper investigates the axial unsteady flow of a generalized Burgers’ fluid with fractional constitutive equation in a circular micro-tube, in presence of a time-dependent pressure gradient and an electric field parallel to flow direction and a magnetic field perpendicular on the flow direction. The mathematical model used in this work is based on a time-nonlocal constitutive equation for s...

Homogeneous Electrorheological Fluids Applied to Vibration Control

The purpose Electrorheological (ER) fluids are capable of providing continuously variable damping forces in response to an electrical stimulus. Many prototype ER dampers, described in the literature, have been based upon exploiting the variable shear properties of ER fluids. Recently, an alternative mode of operation, namely squeeze-flow, has been identified and investigated. Furthermore, most ...