Design and testing of a regenerative magnetorheological actuator for assistive knee braces
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AbstractIn this paper, a multifunctional magneto-rheological actuator with power regeneration capability, named regenerative magnetorheological actuator (RMRA), is designed for gait assistance in the knee joint. RMRA has motor and magnetorheological (MR) brake parts working in parallel that can harvest energy through regenerative braking. This novel design provides multiple functions with good energy efficiency. The configuration and basic design of the RMRA are first introduced. Then geometrical optimization of the MR brake is conducted based on a parameterized model, and multiple factors are considered in the design objectives: braking torque, weight, and power consumption. After the optimal design is obtained, an RMRA prototype is fabricated and associated driver circuits are designed. Finally, multiple functions of the RMRA, especially three different braking modes, are modeled and tested. Experimental results of RMRA output performances in all working modes match the modeling and simulation. Assistive knee braces with the developed RMRA are promising for future applications in gait assistance and rehabilitation.
All Author(s) ListMa H, Chen B, Qin L, Liao WH
Journal nameSmart Materials and Structures
Volume Number26
Issue Number3
Article number035013
LanguagesEnglish-United Kingdom
Keywordsregenerative magnetorheological actuator, assistive knee brace, geometrical optimization
Web of Science Subject CategoriesInstruments & Instrumentation;Materials Science, Multidisciplinary;Instruments & Instrumentation;Materials Science

Last updated on 2020-07-07 at 02:56