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• W3111039570 abstract "We study the efficiency of sliding locomotion for three-link bodies in the presence of dry (Coulomb) friction. Friction coefficient space can be partitioned into several regions, each with distinct types of efficient kinematics. These include kinematics resembling lateral undulation with very anisotropic friction, small-amplitude reciprocal kinematics, very large amplitude kinematics near isotropic friction, and kinematics that are very asymmetric about the flat state. In the two-parameter shape space, zero net rotation for elliptical trajectories occurs mainly with bilateral or antipodal symmetry. These symmetric subspaces have about the same peak efficiency as the full space but with much smaller dimension. Adding modes with two or three times the basic frequency greatly increases the numbers of local optimal for efficiency, but only modestly increases the peak efficiency. Random ensembles with higher frequencies have efficiency distributions that peak near a certain nonzero value and decay rapidly up to the maximum efficiency. A stochastic optimization algorithm is developed to compute optima with higher frequencies. These are simple closed curves, sharpened versions of the elliptical optima in most cases, and achieve much higher efficiencies mainly for small normal friction. With a linear resistance law, the optimal trajectories are similar in much of friction coefficient space, and relative efficiencies are much lower except with very large normal friction." @default.
• W3111039570 created "2020-12-21" @default.
• W3111039570 creator A5021063140 @default.
• W3111039570 date "2021-04-16" @default.
• W3111039570 modified "2023-09-27" @default.
• W3111039570 title "Efficient sliding locomotion of three-link bodies" @default.
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• W3111039570 doi "https://doi.org/10.1103/physreve.103.042414" @default.
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