1
|
Mohammadi Nejad Rashty A, Sharbafi MA, Mohseni O, Seyfarth A. Role of compliant mechanics and motor control in hopping - from human to robot. Sci Rep 2024; 14:6820. [PMID: 38514699 PMCID: PMC10957903 DOI: 10.1038/s41598-024-57149-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 03/14/2024] [Indexed: 03/23/2024] Open
Abstract
Compliant leg function found during bouncy gaits in humans and animals can be considered a role model for designing and controlling bioinspired robots and assistive devices. The human musculoskeletal design and control differ from distal to proximal joints in the leg. The specific mechanical properties of different leg parts could simplify motor control, e.g., by taking advantage of passive body dynamics. This control embodiment is complemented by neural reflex circuitries shaping human motor control. This study investigates the contribution of specific passive and active properties at different leg joint levels in human hopping at different hopping frequencies. We analyze the kinematics and kinetics of human leg joints to design and control a bioinspired hopping robot. In addition, this robot is used as a test rig to validate the identified concepts from human hopping. We found that the more distal the joint, the higher the possibility of benefit from passive compliant leg structures. A passive elastic element nicely describes the ankle joint function. In contrast, a more significant contribution to energy management using an active element (e.g., by feedback control) is predicted for the knee and hip joints. The ankle and knee joints are the key contributors to adjusting hopping frequency. Humans can speed up hopping by increasing ankle stiffness and tuning corresponding knee control parameters. We found that the force-modulated compliance (FMC) as an abstract reflex-based control beside a fixed spring can predict human knee torque-angle patterns at different frequencies. These developed bioinspired models for ankle and knee joints were applied to design and control the EPA-hopper-II robot. The experimental results support our biomechanical findings while indicating potential robot improvements. Based on the proposed model and the robot's experimental results, passive compliant elements (e.g. tendons) have a larger capacity to contribute to the distal joint function compared to proximal joints. With the use of more compliant elements in the distal joint, a larger contribution to managing energy changes is observed in the upper joints.
Collapse
Affiliation(s)
- Aida Mohammadi Nejad Rashty
- Lauflabor Locomotion Laboratory, Institute of Sport Science and Centre for Cognitive Science, Technical University of Darmstadt, Darmstadt, 64289, Germany.
| | - Maziar A Sharbafi
- Lauflabor Locomotion Laboratory, Institute of Sport Science and Centre for Cognitive Science, Technical University of Darmstadt, Darmstadt, 64289, Germany
| | - Omid Mohseni
- Lauflabor Locomotion Laboratory, Institute of Sport Science and Centre for Cognitive Science, Technical University of Darmstadt, Darmstadt, 64289, Germany
| | - André Seyfarth
- Lauflabor Locomotion Laboratory, Institute of Sport Science and Centre for Cognitive Science, Technical University of Darmstadt, Darmstadt, 64289, Germany
| |
Collapse
|
2
|
Silva AB, Murcia M, Mohseni O, Takahashi R, Forner-Cordero A, Seyfarth A, Hosoda K, Sharbafi MA. Design of Low-Cost Modular Bio-Inspired Electric-Pneumatic Actuator (EPA)-Driven Legged Robots. Biomimetics (Basel) 2024; 9:164. [PMID: 38534849 DOI: 10.3390/biomimetics9030164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 02/29/2024] [Accepted: 03/04/2024] [Indexed: 03/28/2024] Open
Abstract
Exploring the fundamental mechanisms of locomotion extends beyond mere simulation and modeling. It necessitates the utilization of physical test benches to validate hypotheses regarding real-world applications of locomotion. This study introduces cost-effective modular robotic platforms designed specifically for investigating the intricacies of locomotion and control strategies. Expanding upon our prior research in electric-pneumatic actuation (EPA), we present the mechanical and electrical designs of the latest developments in the EPA robot series. These include EPA Jumper, a human-sized segmented monoped robot, and its extension EPA Walker, a human-sized bipedal robot. Both replicate the human weight and inertia distributions, featuring co-actuation through electrical motors and pneumatic artificial muscles. These low-cost modular platforms, with considerations for degrees of freedom and redundant actuation, (1) provide opportunities to study different locomotor subfunctions-stance, swing, and balance; (2) help investigate the role of actuation schemes in tasks such as hopping and walking; and (3) allow testing hypotheses regarding biological locomotors in real-world physical test benches.
Collapse
Affiliation(s)
- Alessandro Brugnera Silva
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, Technical University of Darmstadt, 64289 Darmstadt, Germany
- Biomechatronics Laboratory, Department of Mechatronics and Mechanical Systems of the Polytechnic School of the University of São Paulo (USP), São Paulo 05508-030, SP, Brazil
| | - Marc Murcia
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, Technical University of Darmstadt, 64289 Darmstadt, Germany
| | - Omid Mohseni
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, Technical University of Darmstadt, 64289 Darmstadt, Germany
| | - Ryu Takahashi
- Adaptive Robotics Laboratory, Graduate School of Engineering Science, Osaka University, Toyonaka 560-0043, Japan
| | - Arturo Forner-Cordero
- Biomechatronics Laboratory, Department of Mechatronics and Mechanical Systems of the Polytechnic School of the University of São Paulo (USP), São Paulo 05508-030, SP, Brazil
| | - Andre Seyfarth
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, Technical University of Darmstadt, 64289 Darmstadt, Germany
| | - Koh Hosoda
- Adaptive Robotics Laboratory, Graduate School of Engineering Science, Osaka University, Toyonaka 560-0043, Japan
- Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Maziar Ahmad Sharbafi
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, Technical University of Darmstadt, 64289 Darmstadt, Germany
| |
Collapse
|
3
|
Vonwirth P, Berns K. Muscular Damping Distribution Strategy for Bio-Inspired, Soft Motion Control at Variable Precision. SENSORS (BASEL, SWITZERLAND) 2023; 23:2428. [PMID: 36904631 PMCID: PMC10007275 DOI: 10.3390/s23052428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 06/18/2023]
Abstract
Bio-inspired and compliant control approaches have been studied by roboticists for decades to achieve more natural robot motion. Independent of this, medical and biological researchers have discovered a wide variety of muscular properties and higher-level motion characteristics. Although both disciplines strive to better understand natural motion and muscle coordination, they have yet to meet. This work introduces a novel robotic control strategy that bridges the gap between these distinct areas. By applying biological characteristics to electrical series elastic actuators, we developed a simple yet efficient distributed damping control strategy. The presented control covers the entire robotic drive train, from abstract whole-body commands to the applied current. The functionality of this control is biologically motivated, theoretically discussed, and finally evaluated through experiments on the bipedal robot Carl. Together, these results demonstrate that the proposed strategy fulfills all requirements that are necessary to continue developing more complex robotic tasks based on this novel muscular control philosophy.
Collapse
|
4
|
Mohseni O, Schmidt P, Seyfarth A, Sharbafi MA. Unified GRF-based control for adjusting hopping frequency with various robot configurations. Adv Robot 2022. [DOI: 10.1080/01691864.2022.2077637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Omid Mohseni
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, TU Darmstadt, Darmstadt, Germany
| | - Patrick Schmidt
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, TU Darmstadt, Darmstadt, Germany
| | - Andre Seyfarth
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, TU Darmstadt, Darmstadt, Germany
| | - Maziar A. Sharbafi
- Lauflabor Locomotion Laboratory, Centre for Cognitive Science, TU Darmstadt, Darmstadt, Germany
| |
Collapse
|