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Proceedings Paper

Design optimization of a magnetorheological brake in powered knee orthosis
Author(s): Hao Ma; Wei-Hsin Liao
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Paper Abstract

Magneto-rheological (MR) fluids have been utilized in devices like orthoses and prostheses to generate controllable braking torque. In this paper, a flat shape rotary MR brake is designed for powered knee orthosis to provide adjustable resistance. Multiple disk structure with interior inner coil is adopted in the MR brake configuration. In order to increase the maximal magnetic flux, a novel internal structure design with smooth transition surface is proposed. Based on this design, a parameterized model of the MR brake is built for geometrical optimization. Multiple factors are considered in the optimization objective: braking torque, weight, and, particularly, average power consumption. The optimization is then performed with Finite Element Analysis (FEA), and the optimal design is obtained among the Pareto-optimal set considering the trade-offs in design objectives.

Paper Details

Date Published: 2 April 2015
PDF: 8 pages
Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 94311J (2 April 2015); doi: 10.1117/12.2084513
Show Author Affiliations
Hao Ma, The Chinese Univ. of Hong Kong (Hong Kong, China)
Wei-Hsin Liao, The Chinese Univ. of Hong Kong (Hong Kong, China)

Published in SPIE Proceedings Vol. 9431:
Active and Passive Smart Structures and Integrated Systems 2015
Wei-Hsin Liao, Editor(s)

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