Abstract
Steady swimming appears both periodic and stable. These characteristics are the very definition of limit cycles, and so we ask “Can we view swimming as a limit cycle?” In this paper we will not be able to answer this question in full. However, we shall find that reduction by \(\mathop{\mathrm{SE}}\nolimits (d)\)-symmetry brings us closer. Upon performing reduction by symmetry, we will find a stable fixed point which corresponds to a motionless body in stagnant water. We will then speculate on the existence of periodic orbits which are “approximately” limit cycles in the reduced system. When we lift these periodic orbits from the reduced phase space, we obtain dynamically robust relatively periodic orbits wherein each period is related to the previous by an \(\mathop{\mathrm{SE}}\nolimits (d)\) phase. Clearly, an \(\mathop{\mathrm{SE}}\nolimits (d)\) phase consisting of nonzero translation and identity rotation means directional swimming, while non-trivial rotations correspond to turning with a constant turning radius.
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Notes
- 1.
Central patter generators (CPGs) are neural networks which produce time-periodic signals.
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We view \(\mathfrak{X}(M)\) as a Fréchet vector space.
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- 4.
This is a pseudo Lie group. We will assume that all diffeomorphisms approach the identity as \(\|x\| \rightarrow \infty \) sufficiently rapidly for all computations to make sense. In particular, the existence of a Hodge-decomposition for our space is important. Sufficient conditions for our purposes are provided in [8] and [43].
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Acknowledgements
The notion of swimming as a limit cycle was initially introduced to me by Erica J. Kim while she was studying hummingbirds. Additionally, Sam Burden, Ram Vasudevan, and Humberto Gonzales provided much insight into how to frame this work for engineers. I would also like to thank Professor Shankar Sastry for allowing me to stay in his lab for a year and meet people who are outside of my normal research circle. I would like to thank Eric Tytell for suggesting relevant articles in neurobiology, Amneet Pal Singh Bhalla for allowing me to reproduce figures from [7], and Peter Wallen for allowing me to reproduce figures from [46]. An early version of this paper was written in the context of Lie groupoid theory, where the guidance of Alan Weinstein was invaluable. Jaap Eldering and Joris Vankerschaver have given me more patience than I may deserve by reading my papers and checking my claims. Major contributions to the bibliography and the overall presentation of the paper were provided by Jair Koiller. Finally, the writing of this paper was solidified with the help of Darryl Holm. This research has been supported by the European Research Council Advanced Grant 267382 FCCA and NSF grant CCF-1011944.
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Jacobs, H.O. (2015). The Role of \(\mathop{\mathrm{SE}}\nolimits (d)\)-Reduction for Swimming in Stokes and Navier-Stokes Fluids. In: Chang, D., Holm, D., Patrick, G., Ratiu, T. (eds) Geometry, Mechanics, and Dynamics. Fields Institute Communications, vol 73. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2441-7_8
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