{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Kobayashi S"],"funding":["Japan Society for the Promotion of Science (JSPS), KAKENHI"],"pagination":["198"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12025331"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["10(4)"],"pubmed_abstract":["In this study, we investigated the thrust enhancement in a bio-inspired underwater propulsion fin using a shear-stiffening gel. Shear-stiffening gels exhibit velocity-dependent stiffness, i.e., they become stiffer during high-speed deformation and softer during low-speed motion, providing adaptive mechanical properties without requiring complex mechanisms. A \"compound joint\" incorporating a dilatant compound, a material of shear-stiffening gel, was developed and experimentally evaluated against a \"rigid joint\" and a flexible \"urethane joint\". A speed-ratio control strategy was employed to assign faster and slower oscillations during positive and negative thrust intervals, respectively. The results demonstrated that the compound joint achieved a balance between high thrust and stable performance. Its adaptive stiffness effectively reduced deformation during high-speed oscillations, enhanced thrust while maintaining flexibility during low-speed intervals, and minimized thrust fluctuations. Compared with the rigid and urethane joints, the compound joint exhibited a superior balance between a high average thrust and low thrust variation."],"journal":["Biomimetics (Basel, Switzerland)"],"pubmed_title":["Enhancing Thrust in Underwater Bio-Inspired Propulsion Fin Using Shear-Stiffening Gel."],"pmcid":["PMC12025331"],"funding_grant_id":["JP18K04047"],"pubmed_authors":["Kobayashi S","Jonishi Y"],"additional_accession":[]},"is_claimable":false,"name":"Enhancing Thrust in Underwater Bio-Inspired Propulsion Fin Using Shear-Stiffening Gel.","description":"In this study, we investigated the thrust enhancement in a bio-inspired underwater propulsion fin using a shear-stiffening gel. Shear-stiffening gels exhibit velocity-dependent stiffness, i.e., they become stiffer during high-speed deformation and softer during low-speed motion, providing adaptive mechanical properties without requiring complex mechanisms. A \"compound joint\" incorporating a dilatant compound, a material of shear-stiffening gel, was developed and experimentally evaluated against a \"rigid joint\" and a flexible \"urethane joint\". A speed-ratio control strategy was employed to assign faster and slower oscillations during positive and negative thrust intervals, respectively. The results demonstrated that the compound joint achieved a balance between high thrust and stable performance. Its adaptive stiffness effectively reduced deformation during high-speed oscillations, enhanced thrust while maintaining flexibility during low-speed intervals, and minimized thrust fluctuations. Compared with the rigid and urethane joints, the compound joint exhibited a superior balance between a high average thrust and low thrust variation.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Mar","modification":"2025-07-01T03:05:49.135Z","creation":"2025-07-01T03:05:49.135Z"},"accession":"S-EPMC12025331","cross_references":{"pubmed":["40277597"],"doi":["10.3390/biomimetics10040198"]}}