Mechanism and Robotics

Design of a Passive Gait-based Ankle-foot Exoskeleton with Self-adaptive Capability

  • Xiangyang Wang ,
  • Sheng Guo ,
  • Bojian Qu ,
  • Majun Song ,
  • Haibo Qu
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  • 1. Robotics Institute, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
    3. School of Engineering Science, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden

Received date: 2019-12-28

  Revised date: 2020-05-17

  Online published: 2020-08-01

Supported by

Supported by Beijing Natural Science Foundation(Grant No.L172021), National Natural Science Foundation of China(Grant No.51875033), and Fundamental Research Funds for the Central Universities(Grant No.2019YJS164)

Abstract

Propulsion during push-off is the key to realizing human locomotion. Humans have evolved a way of walking with high energy utilization, but it can be further improved. Drawing inspiration from the muscle-tendon unit, a passive spring-actuated ankle-foot exoskeleton is designed to assist with human walking and to lengthen walking duration by mechanically enhancing walking efficiency. Detection of the gait events is realized using a smart clutch, which is designed to detect the contact states between the shoe sole and the ground, and automatically switch its working state. The engagement of a suspended spring behind the human calf muscles is hence controlled and is in synchrony with gait. The device is completely passive and contains no external power source. Energy is stored and returned passively using the clutch. In our walking trials, the soleus electromyography activity is reduced by as much as 72.2% when the proposed ankle-foot exoskeleton is worn on the human body. The influence of the exoskeleton on walking habits is also studied. The results show the potential use of the exoskeleton in humans' daily life.

Cite this article

Xiangyang Wang , Sheng Guo , Bojian Qu , Majun Song , Haibo Qu . Design of a Passive Gait-based Ankle-foot Exoskeleton with Self-adaptive Capability[J]. Chinese Journal of Mechanical Engineering, 2020 , 33(3) : 49 -49 . DOI: 10.1186/s10033-020-00465-z

References

[1] S H Collins, M B Wiggin, G S Sawicki. Reducing the energy cost of human walking using an unpowered exoskeleton. Nature, 2015, 522(7555): 212.
[2] D J Farris, G S Sawicki. The mechanics and energetics of human walking and running: A joint level perspective. Journal of the Royal Society Interface, 2012, 9(66): 110-118.
[3] G S Sawicki, D P Ferris. Mechanics and Energetics of level walking with powered ankle exoskeletons. Journal of Experimental Biology, 2008, 211(9): 1402-1413.
[4] J A Blaya, H M Herr. Adaptive control of a variable-impedance ankle-foot orthosis to assist drop-foot gait. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2004, 12(1): 24-31.
[5] A M Dollar, H M Herr. Lower extremity exoskeletons and active orthoses: challenges and state-of-the-art. IEEE Transactions on Robotics, 2008, 24(1): 144-158.
[6] P Malcolm, W Derave, S Galle, et al. A simple exoskeleton that assists plantarflexion can reduce the metabolic cost of human walking. PLOS ONE, 2013, 8(2): e56137.
[7] L M Mooney, E J Rouse, H M Herr. Autonomous exoskeleton reduces metabolic cost of human walking during load carriage. Journal of Neuro-Engineering and Rehabilitation, 2014, 11(1): 80.
[8] L M Mooney, H M Herr. Biomechanical walking mechanisms underlying the metabolic reduction caused by an autonomous exoskeleton. Journal of Neuro-Engineering and Rehabilitation, 2016, 13(1): 4.
[9] J Liu, C Xiong, C Fu. An Ankle Exoskeleton using a lightweight motor to create high power assistance for push-off. Journal of Mechanisms and Robotics, 2019, 11(4): 041001.
[10] C Meijneke, W V Dijk, H V D Kooij. Achilles: an autonomous lightweight ankle exoskeleton to provide push-off power. Proc. 5th IEEE RAS/EMBS International Conference on Biomedical Robotics and Biomechatronics, Sao Paulo, Brazil, IEEE, 2014.10.1109/BIOROB.2014.6913898
[11] S Galle, W Derave, F Bossuyt, et al. Exoskeleton plantarflexion assistance for elderly. Gait and Posture, 2017, 52: 183-188.
[12] S Galle, P Malcolm, W Derave, et al. Enhancing performance during inclined loaded walking with a powered ankle–foot exoskeleton. European Journal of Applied Physiology, 2014, 114(11): 2341-2351.
[13] D P Ferris, J M Czerniecki, B Hannaford. An ankle-foot orthosis powered by artificial pneumatic muscles. Journal of Applied Biomechanics, 2005, 21(2): 189-197.
[14] D P Ferris, K E Gordon, G S Sawicki, et al. An improved powered ankle– foot orthosis using proportional myoelectric control. Gait and Posture, 2006, 23(4): 425-428.
[15] P Kao, C L Lewis, D P Ferris. Invariant ankle moment patterns when walking with and without a robotic ankle exoskeleton. Journal of Biomechanics, 2010, 43(2): 203-209.
[16] G S Sawicki, K E Gordon, D P Ferris. Powered lower limb orthoses: applications in motor adaptation and rehabilitation. Proc. International Conference on Rehabilitation Robotics, Chicago, IL, USA, 2005: 206-211.10.1109/ICORR.2005.1501086
[17] R C Browning, J R Modica, R Kram, et al. The effects of adding mass to the legs on the energetics and biomechanics of walking. Medicine and Science in Sports and Exercise, 2006, 39(3): 515-525.
[18] R W Jackson, S H Collins. An experimental comparison of the relative benefits of work and torque assistance in ankle exoskeletons. Journal of Applied Physiology, 2015, 119(5): 541-557.
[19] K A Witte, J Zhang, R W Jackson, et al. Design of two lightweight, highbandwidth torque-controlled ankle exoskeletons. Proc. International Conference on Robotics and Automation, Seattle, WA, USA, IEEE, 2015: 1223-1228.
[20] J Zhang, P Fiers, K A Witte, et al. Human-in-the-loop optimization of exoskeleton assistance during walking. Science, 2017, 356(6344): 1280-1284.
[21] J Zhang, C Cheah, S H Collins. Experimental comparison of torque control methods on an ankle exoskeleton during human walking. Proc. International Conference on Robotics and Automation, Seattle, WA, USA, IEEE, 2015: 5584-5589.10.1109/ICRA.2015.7139980
[22] M B Wiggin, G S Sawicki, S H Collins. An exoskeleton using controlled energy storage and release to aid ankle propulsion. Proc. International Conference on Rehabilitation Robotics, Zurich, Switzerland, IEEE, 2011: 12178956.
[23] A M Grabowski, H M Herr. Leg exoskeleton reduces the metabolic cost of human hopping. Journal of Applied Physiology, 2009, 107(3): 670-678.
[24] D J Farris, G S Sawicki. Linking the mechanics and energetics of hopping with elastic ankle exoskeletons. Journal of Applied Physiology, 2012, 113(12): 1862-1872.
[25] S Diller, C Majidi, S H Collins. A lightweight, low-power electroadhesive clutch and spring for exoskeleton actuation. Proc. International Conference on Robotics and Automation, Stockholm, Sweden, IEEE, 2016: 682-689.10.1109/ICRA.2016.7487194
[26] S B Diller, S H Collins, C Majidi. The effects of electroadhesive clutch design parameters on performance characteristics. Journal of Intelligent Material Systems and Structures, 2018, 29(19): 3804-3828.
[27] M B Yandell, J R Tacca, K E Zelik. Design of a low profile, unpowered ankle exoskeleton that fits under clothes: overcoming practical barriers to widespread societal adoption. IEEE Transactions on Neural Systems & Rehabilitation Engineering, 2019, 27(4): 712-723.
[28] X Wang, S Guo, B Q, et al. Design of a purely mechanical sensor-controller integrated system for walking assistance on an ankle-foot exoskeleton. Sensors, 2019, 19(14): 3196.
[29] P H Tzu-wei, A D Kuo. Mechanics and energetics of load carriage during human walking. Journal of Experimental Biology, 2014, 217(4): 605-613.
[30] G S Sawicki, C L Lewis, D P Ferris. It pays to have a spring in your step. Exercise and Sport Sciences Reviews, 2009, 37(3): 130-138.
[31] A D Kuo, J M Donelan, A Ruina. Energetic consequences of walking like an inverted pendulum: Step-to-step transitions. Exercise and Sport Sciences Reviews, 2005, 33(2): 88-97.
[32] G S Sawicki, N S Khan. A simple model to estimate plantarflexor muscletendon mechanics and energetics during walking with elastic ankle exoskeletons. IEEE Transactions on Neural Systems & Rehabilitation Engineering, 2015, 63(5): 914-923.
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