Abstract
Exoskeleton robots are generally used for rehabilitation and load-carrying applications. Stable and flexible walking with minimal energy consumption of the human body is achieved by the compliant operation of the human joints. Essentially, the stiffness of the human ankle joint varies continuously, while the stiffness of the knee and hip joints remains nearly constant during loading phases of the walking cycles. With inspiration from the human leg biomechanics, a new biomimetic compliant lower limb exoskeleton robot (BioComEx) was constructed and its preliminary experimental tests were carried out in this paper. A variable stiffness actuator was developed for the ankle joint of BioComEx, and series elastic actuator designs were employed in the knee and hip joints of the robot. The joint actuators of BioComEx were designed longitudinally in order to be embedded inside of the thigh and shank leg segments for the compactness. Separate force sensors were employed in each segment of the robot for the modularity of the control strategies. Since the exoskeletons can be used for both load-carrying and rehabilitation, the developed robot was tested in both human-in-charge and robot-in-charge modes, respectively. The robot needs to mimic movement of healthy user joints in the human-in-charge mode and maximize the compliance between the user and robot; thus, the interaction forces should be reduced as possible. Hence, a modular closed-loop impedance control algorithm was developed for this mode. On the other hand, in the robot-in-charge mode, the robot joints need to track predefined gait references to make the patient walk. PID position control algorithm was chosen for preliminary test of the robot in this mode. Experimental results show that BioComEx is sufficiently satisfactory for walking applications of healthy and paralyzed users.
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References
Kazerooni H (2007) Human augmentation and exoskeleton systems in Berkeley. Int J Humanoid Rob 4(3):575–605
Neuhaus PD, Noorden JH, Craig TJ, Torres T, Kirschbaum J, Pratt JE (2011) Design and evaluation of Mina: a robotic orthosis for paraplegics. In: IEEE international conference on rehabilitation robotics (ICORR), pp 1–18
Suzuki K, Mito G, Kawamoto H, Hasegawa Y, Sankai Y (2007) Intention-based walking support for paraplegia patients with Robot Suit HAL. Adv Robot 21(12):1441–1469
Veneman JF, Kruidhof R, Hekman EE, Ekkelenkamp R, Van Asseldonk EH, Van Der Kooij H (2007) Design and evaluation of the LOPES exoskeleton robot for interactive gait rehabilitation. IEEE Trans Neural Syst Rehabil Eng 15(3):379–386
Pons Jose L (2008) Wearable robots: biomechatronics exoskeletons. Wiley, New York
Dollar AM, Hugh H (2008) Lower extremity exoskeletons and active orthoses: challenges and state-of-the-art. IEEE Trans Rob 24(1):144–158
Van Ham R, Sugar TG, Vanderborght B, Hollander KW, Lefeber D (2009) Compliant actuator designs. IEEE Robot Autom Mag 16(3):81–94
Pratt GA, Williamson MM (1995) Series elastic actuators. In: Proceedings 1995 IEEE/RSJ international conference on intelligent robots and systems. Human robot interaction and cooperative robots, vol 1, pp 399–406
Wang S, Wang L, Meijneke C, Van Asseldonk E, Hoellinger T, Cheron G, Tamburella F (2015) Design and control of the MINDWALKER exoskeleton. IEEE Trans Neural Syst Rehabil Eng 23(2):277–286
Kwa HK, Noorden JH, Missel M, Craig T, Pratt JE, Neuhaus PD (2009) Development of the IHMC mobility assist exoskeleton. In: IEEE International conference on robotics and automation, ICRA’09, pp 2556–2562
Zhang C, Liu G, Li C, Zhao J, Yu H, Zhu Y (2016) Development of a lower limb rehabilitation exoskeleton based on real-time gait detection and gait tracking. Adv Mech Eng 8(1):1–9
Beyl P, Knaepen K, Duerinck S, Van Damme M, Vanderborght B, Meeusen R, Lefeber D (2011) Safe and compliant guidance by a powered knee exoskeleton for robot-assisted rehabilitation of gait. Adv Robot 25(5):513–535
Torrealba RR, Udelman SB, Fonseca-Rojas ED (2017) Design of variable impedance actuator for knee joint of a portable human gait rehabilitation exoskeleton. Mech Mach Theory 116:248–261
Cestari M, Sanz-Merodio D, Arevalo JC, Garcia E (2014) ARES, a variable stiffness actuator with embedded force sensor for the ATLAS exoskeleton. Ind Robot Int J 41(6):518–526
Cestari M, Sanz-Merodio D, Arevalo JC, Garcia E (2015) An adjustable compliant joint for lower-limb exoskeletons. IEEE/ASME Trans Mechatron 20(2):889–898
Zhu J, Wang Y, Jiang J, Sun B, Cao H (2017) Unidirectional variable stiffness hydraulic actuator for load-carrying knee exoskeleton. Int J Adv Rob Syst 14(1):1–12
Hyon SH, Morimoto J, Matsubara T, Noda T, Kawato M (2011) XoR: Hybrid drive exoskeleton robot that can balance. In: IEEE/RSJ international conference on intelligent robots and systems (IROS), pp 3975–3981
Baser O, Kizilhan H (2018) Mechanical design and preliminary tests of VS-AnkleExo. J Braz Soc Mech Sci Eng 40(442):1–16
Baser O, Kizilhan H, Kilic E (2016) Mechanical design of a biomimetic compliant lower limb exoskeleton (BioComEx). In: International conference on autonomous robot systems and competitions (ICARSC), pp 60–65
Shamaei K, Sawicki GS, Dollar AM (2013) Estimation of quasi-stiffness and propulsive work of the human ankle in the stance phase of walking. PloS One 8(3):e59935
Kizilhan H, Baser O, Kilic E, Ulusoy N (2015) Comparison of controllable transmission ratio type variable stiffness actuator with antagonistic and pre-tension type actuators for the joints exoskeleton robots. In: 12th international conference on informatics in control, automation and robotics (ICINCO), Vol 2, pp 188–195
Shamaei K, Sawicki GS, Dollar AM (2013) Estimation of quasi-stiffness of the human knee in the stance phase of walking. PLoS One 8(3):e59993
Shamaei K, Sawicki GS, Dollar AM (2013) Estimation of quasi-stiffness of the human hip in the stance phase of walking. PLoS One 8(12):e81841
Frigo C, Crenna P, Jensen LM (1996) Moment-angle relationship at lower limb joints during human walking at different velocities. J Electromyogr Kinesiol 6(3):177–190
Shamaei K, Dollar AM (2011) On the mechanics of the knee during the stance phase of the gait. In: 2011 IEEE international conference on rehabilitation robotics, pp 1–7
Bovi G, Rabuffetti M, Mazzoleni P, Ferrarin M (2011) A multiple-task gait analysis approach: kinematic, kinetic and EMG reference data for healthy young and adult subjects. Gait Posture 33(1):6–13
Holgate MA, Hitt JK, Bellman RD, Sugar TG, Hollander KW (2008) The SPARKy (Spring Ankle with Regenerative kinetics) project: Choosing a DC motor based actuation method. In: 2008 2nd IEEE RAS & EMBS international conference on biomedical robotics and biomechatronics, pp 163–168
Acknowledgements
The author(s) would like to thank TUBITAK (The Scientific and Technological Research Council of Turkey) for the financial support of a research project numbered with 213M297 and titled as ‘‘Design and control of a biomimetic exoskeleton robot’’.
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Technical Editor: Victor Juliano De Negri, D.Eng.
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Baser, O., Kizilhan, H. & Kilic, E. Biomimetic compliant lower limb exoskeleton (BioComEx) and its experimental evaluation. J Braz. Soc. Mech. Sci. Eng. 41, 226 (2019). https://doi.org/10.1007/s40430-019-1729-4
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DOI: https://doi.org/10.1007/s40430-019-1729-4