Showing papers on "Aquatic locomotion published in 2005"

Locomotion in Aquatic, Terrestrial, and Arboreal Habitat of Thick-Tailed Opossum, Lutreolina crassicaudata (Desmarest, 1804)

Abstract: The reasons Lutreolina crassicaudata is always captured in close proximity to water are not clear. We investigated locomotory behavior and performance in swimming, running, climbing, and jumping of L. crassicaudata. One adult male was videotaped in the laboratory while swimming, walking on the ground and on a horizontal tube 1.2 m from the ground, climbing a tree trunk angled 458, and jumping gaps between supports. The locomotor cycles in these different activities were described by speed, stride length, stroke or stride frequency, time of power and recovery phases or stance and swing phases, and by displacement of points on the animal. L. crassicaudata employed a quadruped paddling gait in swimming. Swimming speed was similar to that of terrestrial didelphids, but stroke frequency and buoyancy ability were more similar to those of the water opossum. Different gaits were used for locomotion in each habitat type and we conclude that L. crassicaudata cannot be considered a specialized species for aquatic locomotion.

Controlled Hydrodynamic Interactions in Schooling Aquatic Locomotion

Abstract: We present experimental data elucidating the effects of hydrodynamic coupling on the propulsive efficiency of an array of three oscillating hydrofoils. We simulate this system using an inviscid flow model; this model duplicates certain key features of our experimental data but fails to consider the effects of wake vortex generation and interaction. We present a qualitative model for the role played by wake vortex dynamics in the cooperative locomotion of fish schools, and derive a mathematical model in the form of a nonlinear control system describing the interaction of a single deformable body with a single nearby vortex. We present simulations based on the latter to illustrate the capture of vortices shed from one fish in a school by a second, trailing fish; vortex capture in this sense is the control problem central to cooperative swimming.

Simulation Study of Fish Swimming Modes for Aquatic Robot System

Abstract: In this paper, we show the simulation result to find the suitable fish swimming modes (especially BCF swimming) for fishlike underwater robot system. To find the suitable swimming modes, we assume that they have the same length, volume, and weight, but they have the different numbers of actuator (joint). And we use the minimum number of joint for each swimming mode. We derive the dynamic equation for each system using Kane’s method and these results are compared by the result of DADS. We present the optimal solution of swimming mode for some aquatic locomotion, especially faster (high propulsive efficiency) and more maneuverable (quick turning motion).

Simulation study of fish swimming modes for aquatic robot system

Abstract: In this paper, we show the simulation result to find the suitable fish swimming modes (specially BCF swimming) for fish like underwater robot system. To find the suitable swimming modes, we assume that they have the same length, volume, and weight, but the different numbers of actuator (joint). And we use the minimum number of the joint for each swimming mode. We derive the dynamic equation for each system using Kane's method and these results are compared by DADS. We present the optimal solution of swimming mode for some aquatic locomotion, especially faster(high propulsive efficiency) and more maneuverable (quick turning motion)