In this paper we present an innovative application of magnetorheological (MR) fluids to haptic interfaces. These materials consist of a suspension of a micron-sized, magnetizable particles in a synthetic oil. Exposure to an external magnetic field induces in the fluid a change in rheological behaviour turning it into a near-solid in few milliseconds. Just as quickly, the fluid can be returned t...

Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, whic...

We present particle dynamics simulations for the response of magnetorheological (MR) uids upon application of a magnetic eld. The particles motion is considered to be governed by magnetic, hydrodynamic and repulsive interactions. Fluid-particle interactions are accounted for via Stokes' drag while inter-particle repulsions are modeled through approximate hard-sphere rejections. In accordance wi...

This is part two of the paper on conceptual design of an engine valve. The previous paper describes the background and the need of an engine valve for an internal combustion engine. The present state of the engine valve technology and the innovations incorporated in its design has been described. This paper presents the conceptualization of an innovative valve train aiming at lesser number of c...

This paper investigates the performance of the semiactive control system based on magnetorheological fluid (MR) dampers for suppressing excessive vibration of stay cable installed in cable-stayed bridges under wind load. The cable model is extracted from a 156.3 m long stay cable with high tension. The external wind load is generated from the widely used wind load spectrum such as the Kaimal sp...

The interface between the particles and carrier fluids has an important influence on performance of magnetorheological fluid (MRF). In this study, ionic liquids silicone oils with same viscosity different surface tensions were used as to prepare two carbonyl iron powder (CIP) fluids. rheological properties evaluated by MCR301 rotating rheometer. experimental results indicate that liquid-based M...

Recently, our collaborative work in the fabrication of a magnetorheological fluid (MRF) containing high magnetization FeCo nanoparticles (NPs, fabricated laboratories using chemical reduction technique; MS = 212 Am2/kg) as magnetic fillers have resulted new MRF with superior performance up to 616.7 kA/m. The had yield stress value 2729 Pa and good reversibility after demagnetization process. Th...

We present an investigation into the important physical principles associated with the self-assembly of magnetorheological (MR) fluids in the microfluidic setting. We concentrate on the role of channel topology in influencing the resulting microstructure. In particular, using Brownian dynamics simulations, we show how a variety of geometrically-simple confining microchannels can be used to stro...