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Development and testing of a passive ankle exoskeleton

Pardoel Scott, Doumit Marc

Biocybernetics and Biomedical Engineering

2019

Vol. 39, no. 3

902--913

Walking Assist Exoskeletons are a class of assistive devices intended to restore a person's independence. Current powered Exoskeletons suffer from limited usability due to power demands. Furthermore, motors and battery packs are often cumbersome and heavy. A passive walking assist device is one that does not rely on an external power source, instead drawing energy out of the gait cycle itself. This study proposes the development and initial testing of a passive ankle exoskeleton intended to provide a plantarflexion torque assist during the push off phase of gait. The design incorporates a Pneumatic Artificial Muscle as a non-linear elastic element to store and release energy during walking. The device also integrates a novel clutch mechanism design to engage and disengage the spring element about the ankle joint during walking such that it does not impede the ankle motion during swing phase. Mechanical testing demonstrated the prototypes ability to function adequately over the natural range of an ankle joint and generate an ankle torque equal to at least 25% of natural ankle torque during normal walking. Using motion capture and electromyography systems, human testing was performed to examine the gait kinematic and muscle activation when the device is worn, unilaterally. The preliminary results show that the exoskeleton is able to reduce the activation of the calf muscles on the limb wearing the device. However, a decrease in ankle joint range of motion is noted in the limb with the device, and, to a much lesser extent the leg without the exoskeleton.

Mechanizmy napędowe z muskułami pneumatycznymi w automatyzacji produkcji

Takosoglu J., Dindorf R., Łaski P.

Pneumatyka

2010

nr 2

29-33

W artykule przedstawiono układy kinematyczne z pneumatycznymi aktuatorami mięśniowymi oraz analizowano możliwości ich zastosowania w automatyzacji produkcji. Przedstawiono stanowisko eksperymentalne mechanizmu napędowego BMDS z dwoma przeciwstawnie działającymi muskułami pneumatycznymi typu DMSP-10-300 oraz wyniki badań eksperymentalnych sterowania położeniem kątowym mechanizmu napędowego.

In paper the kinematic systems with pneumatic actuators, test stand and experimental results the bi-muscular drving system was presented.The test stand consists of two pneumatic muscle DMSP-10-300 with diameter of 10 mm and length of 300 mm, proportional 5/3 control valve MPYE-5-1 /8-HF-010-B controlled by 0-10 V voltage of nominal flow rate 700 l/min and switching frequency 75 Hz, rotational potentiometric transducer. Positioning control of pneumatic bi-muscular driving system was designed and constructed by means of Data Acquisiton Toolbox of MATLAB-Simulink package.