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Dynamic tail modeling and motion analysis of a beaver-like robot

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Abstract

The beaver-like underwater robot can crawl and swim, playing a significant role in the exploration of amphibious environments. The robot's fan-shaped tail offers partial forward propulsion and enhances motion stability. However, a comprehensive method for modeling this tail motion is lacking. This paper introduces a segmented approach to dynamic modeling, building both propulsion and lift models for the robot's beaver-like tail. The approach integrates hydrodynamics with material mechanics to formulate a fan-shaped flexible dynamics theory. A performance index is established to quantify the tail's motion performance, offering a theoretical foundation for its evaluation. To validate the dynamic model and assess motion performance under varying swing amplitude coefficients, both simulations and experiments are undertaken. An optimal swing amplitude coefficient of 2 is identified, setting the stage for future developments in robotic motion control. This work may also advance dynamic modeling and analysis in other biomimetic underwater robots.

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Data availability

In the future, we will conduct more in-depth hydrodynamics research on beaver-like robot, and some data used in this paper will be involved. The data sets generated and analyzed during this study are not public, but can be obtained from the corresponding authors upon reasonable request.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 52275037, 51875528, and 41506116), Zhejiang Provincial Natural Science Foundation of China (No. LR24E050002), the Key Research and Development Project of Zhejiang Province (No. 2023C03015), the Key Research and Development Project of Ningxia Hui Autonomous Region (No. 2023BDE03002).

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Correspondence to Gang Chen.

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Appendix

Appendix

See Figs. 

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figure 13

Propulsion and lift curves of the tail of the beaver-like robot with different amplitude coefficients when f = 1

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figure 14

Propulsion and lift curves of the tail of the beaver-like robot with different amplitude coefficients when f = 4

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Chen, G., Xu, Y., Wang, Z. et al. Dynamic tail modeling and motion analysis of a beaver-like robot. Nonlinear Dyn 112, 6859–6875 (2024). https://doi.org/10.1007/s11071-024-09446-6

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