Design of a squeeze film magnetorheological brake considering compression enhanced shear yield stress of magnetorheological fluid

Structure-Enhanced Yield Stress of Magnetorheological Fluids

The yield stress of magnetorheological ͑MR͒ fluids depends on the induced solid structure. Since thick columns have a yield stress much higher than a single-chain structure, we improve the yield stress of MR fluids by changing the fluid microstructure. Immediately after a magnetic field is applied, we compress the MR fluid along the field direction. Scanning electron microscopy images show that p...

Theoretical Studies on Magnetorheological Fluid Brake

A Magneto-Rheological (MR) fluid brake is a device to transmit torque by the shear force of an MR fluid. An MR rotary brake has the property that its braking torque changes quickly in response to an external magnetic field strength. In this paper, the design method of the cylindrical MR fluid brake is investigated theoretically. The mechanical part is modeled using Bingham’s equation, an approa...

Design and Evaluation of a Magnetorheological Damper Based Prosthetic Knee

In this work, a magnetorheological (MR) damper based above-knee prosthesis is design and evaluated based on its performance in swing phase and in stance phase. Initially, a dynamic system model for swing phase of a prosthetic leg incorporating a single-axis knee with ideal MR damper was built. The dynamic properties of the damper are represented with Bingham parametric model. From Bingham model...

State dependent Riccati equation based filtering and control of a magnetorheological fluid brake

A theoretical/experimental activity has been carried out on a magnetorheological fluid brake prototype. A non-linear observer and an optimal control have been designed and tested on the physical device. Both the feedback control and the state observer are based on the state dependent Riccati equation technique. A first order non-linear dynamic model has been derived and adopted for the developm...

Optimal Design Methodology of Magnetorheological Fluid Based Mechanisms