Technical Briefs

The Torque Capacity of a Magnetorheological Fluid Brake Compared to a Frictional Disk Brake

[+] Author and Article Information
Salwan O. Waheed, Noah D. Manring

Mechanical and Aerospace Engineering,
University of Missouri,
Columbia, MO 65211

1Corresponding author.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received November 29, 2017; final manuscript received January 24, 2018; published online February 27, 2018. Assoc. Editor: Massimo Callegari.

J. Mech. Des 140(4), 044501 (Feb 27, 2018) (4 pages) Paper No: MD-17-1795; doi: 10.1115/1.4039202 History: Received November 29, 2017; Revised January 24, 2018

In this technical brief, the authors compare the torque capacity of a magnetorheological (MR) fluid brake with a conventional frictional disk brake. In the development of the torque models for both brakes, a mathematical expression for the compared torque ratio is presented. For the frictional disk brake, constant pressure and constant wear theories are considered, while static torque of the MR fluid brake is considered for comparison purpose only. Throughout the analysis, the outer radius of the compared brakes is assumed to be the same to ensure similarity of size, while the inner radius is selected to achieve maximum values of braking torque for both brake designs. Reasonable values of design variables for each brake are obtained from references and adopted in this study for making comparisons between the two designs. In conclusion, it is shown that the torque capacity for a frictional disk brake is 10–18 times greater than the torque capacity for a MR fluid brake of similar size.

Copyright © 2018 by ASME
Topics: Torque , Fluids , Disks , Brakes , Pressure
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Grahic Jump Location
Fig. 2

A schematic showing the geometry of an MR fluid brake

Grahic Jump Location
Fig. 1

A schematic showing the geometry of a frictional brake



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