Design optimization of a magnetorheological brake in powered knee orthosis

Hao Ma; Wei-Hsin Liao

doi:10.1117/12.2084513

2 April 2015 Design optimization of a magnetorheological brake in powered knee orthosis

Hao Ma, Wei-Hsin Liao

Proceedings Volume 9431, Active and Passive Smart Structures and Integrated Systems 2015; 94311J (2015) https://doi.org/10.1117/12.2084513
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

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.

Citation Download Citation

Hao Ma and Wei-Hsin Liao "Design optimization of a magnetorheological brake in powered knee orthosis", Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 94311J (2 April 2015); https://doi.org/10.1117/12.2084513

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