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Open AccessArticle

A Numerical Feasibility Study of Kinetic Energy Harvesting from Lower Limb Prosthetics

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School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
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Department of Mechanical Engineering, University of Chester, Chester CH2 4NU, UK
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State Key Laboratory for Manufacturing Systems Engineering, Xian Jiaotong University, 28 West Xianning Road, Xi’an 710049, China
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Key Laboratory of Electronic Equipment Structure Design, Xidian University, Xi’an 710071, China
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Authors to whom correspondence should be addressed.
Energies 2019, 12(20), 3824; https://doi.org/10.3390/en12203824
Received: 9 August 2019 / Revised: 28 September 2019 / Accepted: 6 October 2019 / Published: 10 October 2019
(This article belongs to the Section Energy Fundamentals and Conversion)
With the advancement trend of lower limb prosthetics headed towards bionics (active ankle and knee) and smart prosthetics (gait and condition monitoring), there is an increasing integration of various sensors (micro-electromechanical system (MEMS) accelerometers, gyroscopes, magnetometers, strain gauges, pressure sensors, etc.), microcontrollers and wireless systems, and power drives including motors and actuators. All of these active elements require electrical power. However, inclusion of a heavy and bulky battery risks to undo the lightweight advancements achieved by the strong and flexible composite materials in the past decades. Kinetic energy harvesting holds the promise to recharge a small on-board battery in order to sustain the active systems without sacrificing weight and size. However, careful design is required in order not to over-burden the user from parasitic effects. This paper presents a feasibility study using measured gait data and numerical simulation in order to predict the available recoverable power. The numerical simulations suggest that, depending on the axis, up to 10s mW average electrical power is recoverable for a walking gait and up to 100s mW average electrical power is achievable during a running gait. This takes into account parasitic losses and only capturing a fraction of the gait cycle to not adversely burden the user. The predicted recoverable power levels are ample to self-sustain wireless communication and smart sensing functionalities to support smart prosthetics, as well as extend the battery life for active actuators in bionic systems. The results here serve as a theoretical foundation to design and develop towards regenerative smart bionic prosthetics. View Full-Text
Keywords: human motion; prosthetics; energy recovery; gait; smart devices human motion; prosthetics; energy recovery; gait; smart devices
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MDPI and ACS Style

Jia, Y.; Wei, X.; Pu, J.; Xie, P.; Wen, T.; Wang, C.; Lian, P.; Xue, S.; Shi, Y. A Numerical Feasibility Study of Kinetic Energy Harvesting from Lower Limb Prosthetics. Energies 2019, 12, 3824.

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