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However, simultaneously improving the load capacity of these devices while reducing metabolic costs presents a major challenge in the industry. This paper presents a lower limb exoskeleton that integrates both rigid and flexible structures to facilitate active assistance and passive load transfer at the hip joint. The load transfer experiments were conducted with weights of 10 kg and 15 kg. During static standing, the load transfer rates were recorded at 90.48% and 69.70%, respectively. In dynamic walking, these rates decreased to 62.07% and 43.69%. Furthermore, in metabolic experiments involving a load of 15 kg, metabolic costs in the exoskeleton assistance modes OFF (Assist OFF) and exoskeleton assistance ON (Assist ON) were reduced by 8.3% and 21.61%, respectively, compared to the exoskeleton-free condition (NE). Furthermore, the Assist ON mode further decreased metabolic costs by 13.22% compared to the Assist OFF mode. These findings demonstrate that the rigid-soft coupled lower limb exoskeleton exhibits exceptional load transfer capabilities and effective assistance, highlighting its potential to enhance human performance in weight-bearing activities.<\/jats:p>","DOI":"10.3390\/biomimetics10110757","type":"journal-article","created":{"date-parts":[[2025,11,10]],"date-time":"2025-11-10T15:07:31Z","timestamp":1762787251000},"page":"757","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A Rigid-Flexible Coupled Lower Limb Exoskeleton for Enhancing Load-Bearing Ambulation"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-2227-5352","authenticated-orcid":false,"given":"Yong-Tang","family":"Tian","sequence":"first","affiliation":[{"name":"School of Mechanical and Electrical Engineering, Xi\u2019an University of Architecture and Technology, Xi\u2019an 710055, China"},{"name":"Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4855-9914","authenticated-orcid":false,"given":"Chun-Jie","family":"Chen","sequence":"additional","affiliation":[{"name":"Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao-Jun","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Mechanical and Electrical Engineering, Xi\u2019an University of Architecture and Technology, Xi\u2019an 710055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3348-0691","authenticated-orcid":false,"given":"Wu-Jing","family":"Cao","sequence":"additional","affiliation":[{"name":"Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"367","DOI":"10.3233\/NRE-210300","article-title":"Flexible lower limb exoskeleton systems: A review","volume":"50","author":"Meng","year":"2022","journal-title":"NeuroRehabilitation"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Sun, L., Deng, A., Wang, H., Zhou, Y., and Song, Y. (2025). A soft exoskeleton for hip extension and flexion assistance based on reinforcement learning control. Sci. Rep., 15.","DOI":"10.1038\/s41598-025-89764-w"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Wang, T., Zhang, B., Liu, C., Liu, T., Han, Y., Wang, S., Ferreira, J.P., Dong, W., and Zhang, X. (2022). A review on the rehabilitation exoskeletons for the lower limbs of the elderly and the disabled. Electronics, 11.","DOI":"10.3390\/electronics11030388"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1089\/soro.2019.0023","article-title":"Integration, sensing, and control of a modular soft-rigid pneumatic lower limb exoskeleton","volume":"7","author":"Wang","year":"2020","journal-title":"Soft Robot."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Zhou, Z., Chen, W., Fu, H., Fang, X., and Xiong, C. (2021, January 3\u20135). Design and experimental evaluation of a non-anthropomorphic passive load-carrying exoskeleton. Proceedings of the 2021 6th IEEE International Conference on Advanced Robotics and Mechatronics (ICARM), Chongqing, China.","DOI":"10.1109\/ICARM52023.2021.9536203"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"e11","DOI":"10.1017\/wtc.2021.11","article-title":"Occupational exoskeletons: A roadmap toward large-scale adoption. Methodology and challenges of bringing exoskeletons to workplaces","volume":"2","author":"Crea","year":"2021","journal-title":"Wearable Technol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"105753","DOI":"10.1016\/j.mechmachtheory.2024.105753","article-title":"Non-anthropomorphic passive load-bearing lower-limb exoskeleton with a reconfigurable mechanism based on mechanical intelligence","volume":"201","author":"Zhan","year":"2024","journal-title":"Mech. Mach. Theory"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1345","DOI":"10.1007\/s10439-019-02237-w","article-title":"A battery-powered ankle exoskeleton improves gait mechanics in a feasibility study of individuals with cerebral palsy","volume":"47","author":"Lerner","year":"2019","journal-title":"Ann. Biomed. Eng."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"103117","DOI":"10.1016\/j.apergo.2020.103117","article-title":"Reliability of a battery of tests for functional evaluation of trunk exoskeletons","volume":"86","author":"Kozinc","year":"2020","journal-title":"Appl. Ergon."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Xiang, Y., Yan, X., Su, H., Chen, N., Guo, S., Wu, J., Leng, Y., and Fu, C. (2021, January 26\u201328). Powered super tail: A terrain-adaptive wheel-legged robotic limb to assist human\u2019s load carriage. Proceedings of the 2021 27th International Conference on Mechatronics and Machine Vision in Practice (M2VIP), Shanghai, China.","DOI":"10.1109\/M2VIP49856.2021.9665086"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"5392","DOI":"10.1109\/TMECH.2022.3181261","article-title":"Mechanical compliance and dynamic load isolation design of lower limb exoskeleton for locomotion assistance","volume":"27","author":"Li","year":"2022","journal-title":"IEEE\/ASME Trans. Mechatronics"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"8472510","DOI":"10.1155\/2020\/8472510","article-title":"Interaction Control for Human-Exoskeletons","volume":"2020","author":"Ajayi","year":"2020","journal-title":"J. Control Sci. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"021007","DOI":"10.1115\/1.4054724","article-title":"Design and validation of a torque-controllable series elastic actuator-based hip exoskeleton for dynamic locomotion","volume":"15","author":"Kang","year":"2023","journal-title":"J. Mech. Robot."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"417","DOI":"10.1109\/TMECH.2022.3201255","article-title":"Toward improving actuation transparency and safety of a hip exoskeleton with a novel nonlinear series elastic actuator","volume":"28","author":"Qian","year":"2022","journal-title":"IEEE\/ASME Trans. Mechatronics"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"2456","DOI":"10.1109\/TNSRE.2022.3201383","article-title":"Design and validation of a lightweight hip exoskeleton driven by series elastic actuator with two-motor variable speed transmission","volume":"30","author":"Zhang","year":"2022","journal-title":"IEEE Trans. Neural Syst. Rehabil. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4265","DOI":"10.1109\/LRA.2018.2864352","article-title":"Comfort-centered design of a lightweight and backdrivable knee exoskeleton","volume":"3","author":"Wang","year":"2018","journal-title":"IEEE Robot. Autom. Lett."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"978","DOI":"10.1109\/TRO.2015.2450414","article-title":"Knee joint misalignment in exoskeletons for the lower extremities: Effects on user\u2019s gait","volume":"31","author":"Zanotto","year":"2015","journal-title":"IEEE Trans. Robot."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1109\/TNSRE.2016.2521160","article-title":"State of the art and future directions for lower limb robotic exoskeletons","volume":"25","author":"Young","year":"2016","journal-title":"IEEE Trans. Neural Syst. Rehabil. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"eaar5438","DOI":"10.1126\/scirobotics.aar5438","article-title":"Human-in-the-loop optimization of hip assistance with a soft exosuit during walking","volume":"3","author":"Ding","year":"2018","journal-title":"Sci. Robot."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1375","DOI":"10.1177\/09544119211032010","article-title":"Exoskeleton robots for lower limb assistance: A review of materials, actuation, and manufacturing methods","volume":"235","author":"Hussain","year":"2021","journal-title":"Proc. Inst. Mech. Eng. Part H J. Eng. Med."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1186\/s12984-018-0410-y","article-title":"Autonomous multi-joint soft exosuit with augmentation-power-based control parameter tuning reduces energy cost of loaded walking","volume":"15","author":"Lee","year":"2018","journal-title":"J. Neuroeng. Rehabil."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1038\/s41586-024-08157-7","article-title":"Task-agnostic exoskeleton control via biological joint moment estimation","volume":"635","author":"Molinaro","year":"2024","journal-title":"Nature"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"454","DOI":"10.1109\/LRA.2021.3125723","article-title":"A lower limb exoskeleton with rigid and soft structure for loaded walking assistance","volume":"7","author":"Cao","year":"2021","journal-title":"IEEE Robot. Autom. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Yu, G., and Sun, L. (2024;, January 4\u20137). Combined Rigid-Flexible Weight-Bearing Exoskeleton. Proceedings of the 2024 IEEE International Conference on Mechatronics and Automation (ICMA), Tianjin, China.","DOI":"10.1109\/ICMA61710.2024.10632953"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Wu, B., Chen, C., Wang, S., Chen, H., Wang, Z., Liu, Y., He, T., Zhang, J., and Wu, X. (2024). A Novel Personalized Strategy for Hip Joint Flexion Assistance Based on Human Physiological State. Biosensors, 14.","DOI":"10.3390\/bios14090418"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Chen, C., Zhang, Y., Li, Y., Wang, Z., Liu, Y., Cao, W., and Wu, X. (2020). Iterative learning control for a soft exoskeleton with hip and knee joint assistance. Sensors, 20.","DOI":"10.3390\/s20154333"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Celebi, B., Yalcin, M., and Patoglu, V. (2013, January 3\u20137). AssistOn-Knee: A self-aligning knee exoskeleton. Proceedings of the 2013 IEEE\/RSJ International Conference on Intelligent Robots and Systems, Tokyo, Japan.","DOI":"10.1109\/IROS.2013.6696472"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"065124","DOI":"10.1063\/5.0053899","article-title":"Design and optimization of exoskeleton structure of lower limb knee joint based on cross four-bar linkage","volume":"11","author":"Gao","year":"2021","journal-title":"AIP Adv."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/S0966-6362(01)00174-6","article-title":"Knee moment profiles during walking: Errors due to soft tissue movement of the shank and the influence of the reference coordinate system","volume":"15","author":"Manal","year":"2002","journal-title":"Gait Posture"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/j.robot.2014.08.015","article-title":"A light-weight active orthosis for hip movement assistance","volume":"73","author":"Giovacchini","year":"2015","journal-title":"Robot. Auton. Syst."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"10205","DOI":"10.1109\/TASE.2024.3520148","article-title":"Effective Prediction of Gait Phase for Assisted Walking by Means of Gait-Based Adaptive Oscillators","volume":"22","author":"Wang","year":"2025","journal-title":"IEEE Trans. Autom. Sci. Eng."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"668","DOI":"10.1126\/science.aav7536","article-title":"Reducing the metabolic rate of walking and running with a versatile, portable exosuit","volume":"365","author":"Kim","year":"2019","journal-title":"Science"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"456","DOI":"10.1038\/s41551-022-00984-1","article-title":"Opportunities and challenges in the development of exoskeletons for locomotor assistance","volume":"7","author":"Siviy","year":"2023","journal-title":"Nat. Biomed. Eng."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"737","DOI":"10.1038\/s41551-021-00685-1","article-title":"An epidermal patch for the simultaneous monitoring of haemodynamic and metabolic biomarkers","volume":"5","author":"Sempionatto","year":"2021","journal-title":"Nat. Biomed. Eng."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1142\/S0219843607001138","article-title":"A physiologist\u2019s perspective on robotic exoskeletons for human locomotion","volume":"4","author":"Ferris","year":"2007","journal-title":"Int. J. Humanoid Robot."},{"key":"ref_36","first-page":"463","article-title":"Derivation of formulae used to calculate energy expenditure in man","volume":"41","author":"Brockway","year":"1987","journal-title":"Hum. Nutr. Clin. Nutr."}],"container-title":["Biomimetics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2313-7673\/10\/11\/757\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,12]],"date-time":"2025-11-12T05:12:14Z","timestamp":1762924334000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2313-7673\/10\/11\/757"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,10]]},"references-count":36,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2025,11]]}},"alternative-id":["biomimetics10110757"],"URL":"https:\/\/doi.org\/10.3390\/biomimetics10110757","relation":{},"ISSN":["2313-7673"],"issn-type":[{"value":"2313-7673","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,11,10]]}}}