Optimizing Control of Passive Gait Training Exoskeleton Driven by Pneumatic Muscles Using Switch-Mode Firefly Algorithm
This paper presents a lower-limb exoskeleton that is actuated by pneumatic muscle actuators (PMAs). This exoskeleton system is composed of the mechanical structures, a treadmill, and a weight support system. With the cooperative work of the three parts, the system aims to assist either the elderly f...
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| Veröffentlicht in: | Robotica Jg. 37; H. 12; S. 2087 - 2103 |
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Cambridge University Press
01.12.2019
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| ISSN: | 0263-5747, 1469-8668 |
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| Abstract | This paper presents a lower-limb exoskeleton that is actuated by pneumatic muscle actuators (PMAs). This exoskeleton system is composed of the mechanical structures, a treadmill, and a weight support system. With the cooperative work of the three parts, the system aims to assist either the elderly for muscle strengthening by conducting walking activities or the stroke patients during a rehabilitation training program. A mechanism is developed to separate the PMAs from the wearer’s legs to reduce the subject’s physical exertion. Furthermore, considering the difficulty in the modeling of proposed PMAs-driven exoskeleton, a safe and model-free control strategy called proxy-based sliding mode control (PSMC) is used to ensure proper control of the exoskeleton. However, the favorable performances are strongly dependent on the appropriate control parameters, which may be difficult to obtain with blind tuning. Therefore, we propose a global parameters optimization algorithm called switch-mode firefly algorithm (SMFA) to automatically calculate the pre-defined object function and attain the most applicable parameters. Experimental studies are conducted, and the results show the effectiveness of the proposed method. |
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| AbstractList | This paper presents a lower-limb exoskeleton that is actuated by pneumatic muscle actuators (PMAs). This exoskeleton system is composed of the mechanical structures, a treadmill, and a weight support system. With the cooperative work of the three parts, the system aims to assist either the elderly for muscle strengthening by conducting walking activities or the stroke patients during a rehabilitation training program. A mechanism is developed to separate the PMAs from the wearer’s legs to reduce the subject’s physical exertion. Furthermore, considering the difficulty in the modeling of proposed PMAs-driven exoskeleton, a safe and model-free control strategy called proxy-based sliding mode control (PSMC) is used to ensure proper control of the exoskeleton. However, the favorable performances are strongly dependent on the appropriate control parameters, which may be difficult to obtain with blind tuning. Therefore, we propose a global parameters optimization algorithm called switch-mode firefly algorithm (SMFA) to automatically calculate the pre-defined object function and attain the most applicable parameters. Experimental studies are conducted, and the results show the effectiveness of the proposed method. |
| Author | Cao, Yu Tu, Xikai Huang, Jian Mohammed, Samer Huang, Zhangbo |
| Author_xml | – sequence: 1 givenname: Yu orcidid: 0000-0002-3486-5518 surname: Cao fullname: Cao, Yu email: cao_yu@hust.edu.cn organization: †The Key Laboratory of Image Processing and Intelligent Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, China. E-mails: cao_yu@hust.edu.cn, huang_zb@hust.edu.cn – sequence: 2 givenname: Jian orcidid: 0000-0002-6267-8824 surname: Huang fullname: Huang, Jian email: huang_jan@mail.hust.edu.cn organization: †The Key Laboratory of Image Processing and Intelligent Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, China. E-mails: cao_yu@hust.edu.cn, huang_zb@hust.edu.cn – sequence: 3 givenname: Zhangbo surname: Huang fullname: Huang, Zhangbo email: cao_yu@hust.edu.cn organization: †The Key Laboratory of Image Processing and Intelligent Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, China. E-mails: cao_yu@hust.edu.cn, huang_zb@hust.edu.cn – sequence: 4 givenname: Xikai surname: Tu fullname: Tu, Xikai email: tuxikai@gmail.com organization: ‡School of Mechanical Engineering, Hubei University of Technology, Wuhan, China. E-mail: tuxikai@gmail.com – sequence: 5 givenname: Samer surname: Mohammed fullname: Mohammed, Samer email: samer.mohammed@u-pec.fr organization: ¶The Laboratory of Images, Signals and Intelligent Systems (LISSI), University Paris-Est Créteil (UPEC), 94400 Vitry Sur Seine, France. E-mail: samer.mohammed@u-pec.fr |
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| Keywords | Switch-mode firefly algorithm Proxy-based sliding-mode control Lower-limb exoskeleton Pneumatic muscle actuator |
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| SubjectTerms | Actuators Algorithms Computer Science Cooperative work Exoskeletons Gait Heuristic methods Mathematical models Muscles Optimization Parameters Rehabilitation Robotics Sliding mode control Support systems Training Treadmills Walking |
| Title | Optimizing Control of Passive Gait Training Exoskeleton Driven by Pneumatic Muscles Using Switch-Mode Firefly Algorithm |
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