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Journal of Intelligent Material Systems and Structures
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Mathematical Model of Drum-type MR Brakes using Herschel-Bulkley Shear Model

Alireza Farjoud

School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue, Singapore 639798

Nader Vahdati

School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue, Singapore 639798, mnader{at}ntu.edu.sg

Yap Fook Fah

School of Mechanical and Aerospace Engineering, Nanyang Technological University 50 Nanyang Avenue, Singapore 639798

Most of the commercially available magnetorheological (MR) fluids are only tested up to 1200 1/s shear rates but with no magnetic field. Data are rarely available at high shear rates with magnetic field applied. In most of the applications where MR fluids are used, such as MR rotary brakes or MR translational dampers, the shear rates can be in the order of thousands and in some applications, the shear rates could be in the order of ten thousands (1/s) and higher. At these high shear rates, most MR fluids will be shear thinning and Bingham model will be inappropriate to use. The focus of this study is on the mathematical modeling of a drum-type MR rotary brake using the Herschel-Bulkey model.

Key Words: Key Words: magnetorheological brake • MR fluid • rotary brake • high shear rate • mathematical modeling • design equation • Herschel-Bulkley • Bingham • Lambert W function.

This version was published on May 1, 2008

Journal of Intelligent Material Systems and Structures, Vol. 19, No. 5, 565-572 (2008)
DOI: 10.1177/1045389X07077851
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