Magneto-Rheological Fluids

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

Magneto-Rheological Damper Modelling

A comparative analysis of different models of a Magneto-Rheological (MR) damper was done. Three models were tested: a non-linear ARX, a semi-phenomenological and a phenomenological. Although the non-linear ARX model shown the best result, this is a black-box model with limited use. However, the Semi-Phenomenological model represented an excellent option considering the physical meaning of its p...

Analysis and Design of a New Haptic Box Display Based on Magneto-Rheological Fluids

In this paper we describe a design of an innovative immersive Haptic Black Box (HBB) based on Magneto Rheological Fluids (MRF). By exploiting results from an accurate analysis performed on a previously operating haptic display a new device capable of exciting the MRF with improved performance in terms of magnetic field intensity and spatial resolution has been developed. Due to the core structu...