Abstract
This article presents a design of a novel swimming mechanism based on a linkage mechanism. The generated motions of the proposed mechanism mimic the purely aquatic locomotion of frogs such as Xenopus laevis (X. laevis), including both the motions of the hind legs and the webbed foot. A six-bar linkage mechanism is employed in this study combing with a spatial linkage mechanism to simplify the overall mechanism. Attributes to the optimal design, the number of Degrees of Actuations (DoA) reduces to two in each hindlimb, which realizes miniaturization in the current study. Kinematic analysis is conducted to analyze the locomotion of the spatial mechanism. The hydrodynamic model based on the blade element theory is established to estimate the swimming performance of the designed mechanism. The peak thrust (approximately 0.2 N) is dramatically larger than the minimum drag (−0.023 N) observed in the experiment which increases the efficiency of the prototype’s swimming.
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Funding
This work was supported by the National Key R&D Program of China (2018YFB2001303), the National Natural Science Foundation of China (Grant No. 52075267), the Natural Science Foundation of Jiangsu Province (Grant no. BK20210341), Grant the Fundamental Research Funds for the Central Universities (Grant No. 309201A8801), and the Open Fund of State Key Laboratory of Intelligent Manufacturing System Technology.
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Yucheng Tang conceived the presented idea of the mechanism and organized the whole paper. Xiaolong Yang built the inversed kinematic modeling. Wei Liu built the CAD model and analyzed the assembly simulation. Lizhi Qi proposed multi-objective optimization and selected the design parameters. Yan Wang calculated the kinematic simulation of the designed mechanism. Yulin Wang analyzed the functions of the mechanism and he was responsible for planning and coordinating the steps of the research.
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Tang, Y., Yang, X., Liu, W. et al. Design and Analysis of a Novel Swimming Mechanism Inspired from Frogs. J Intell Robot Syst 105, 23 (2022). https://doi.org/10.1007/s10846-022-01638-9
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DOI: https://doi.org/10.1007/s10846-022-01638-9