Computational and mathematical modeling of the effects of tailbeat frequency and flexural stiffness in swimming fish

Root, Robert G.; Liew, Chun Wai

doi:10.1016/j.zool.2013.11.003

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…However, the simple excitation signals mentioned above cannot accurately represent the mechanisms that generate motor output in biological systems. The reasons for this are mainly the following: Firstly, when fish move, their fins and bodies are deformed, thus generating multiple waves [14,15]. Secondly, the biological locomotor signal is not formed by a single signal, it is generated by a combination of central modulation signals and organ feedback signals [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

Gao

Huang

Pan

2021

JMSE

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A numerical simulation is used to investigate the effects of adding high frequency and low amplitude perturbations of different waveforms to the sinusoidal-based signal of the heaving foil on the propulsion performance and wake structure. We use the adjustable parameter k to achieve a heaving motion of various waveform cycle trajectories, such as sawtooth, sine, and square. Adding a perturbation of whatever waveform is beneficial in increasing the thrust of the heaving foil, especially by adding a square wave perturbation with a frequency of 10 Hz, pushes the thrust up to 10.49 times that without the perturbation. However, the addition of the perturbation signal brings a reduction in propulsion efficiency, and the larger the perturbation frequency, the lower the efficiency. The wake structure of the heaving foil behaves similarly under different waveform perturbations, all going through some intermediate stages, which eventually evolve into a chaotic wake with the increase in the perturbation frequency. However, a lower frequency square wave perturbation can destabilize the heaving foil wake structure. This work further explains the effect of different waveform perturbation signals on the base sinusoidal signal and provides a new control idea for underwater vehicles.

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Section: Introductionmentioning

confidence: 99%

Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

Gao

Huang

Pan

2021

JMSE

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“…As our country keeps a watchful eye to the marine resources, more and more scientific institutions have begun to do research work in the field of caudal fin propulsion and have made certain achievements. The influence of caudal fin stiffness [9,10], caudal fin area [11], fin strip movement [12], and swing phase [13] on caudal fin propulsion, velocity, and efficiency has been preliminarily studied by researchers. Besides, Liu et al [14] considered different thrusts at different frequencies and found that they had a specific optimum frequency under a specific flexible connection.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Biomimetic Caudal Fin Propulsion Mechanism with CFD

Liu

Xie

et al. 2020

Applied Bionics and Biomechanics

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In nature, fish not only have extraordinary ability of underwater movement but also have high mobility and flexibility. The low energy consumption and high efficiency of fish propulsive method provide a new idea for the research of bionic underwater robot and bionic propulsive technology. In this paper, the swordfish was taken as the research object, and the mechanism of the caudal fin propulsion was preliminarily explored by analyzing the flow field structure generated by the swing of caudal fin. Subsequently, the influence of the phase difference of the heaving and pitching movement, the swing amplitude of caudal fin, and Strouhal number (St number) on the propulsion performance of fish was discussed. The results demonstrated that the fish can obtain a greater propulsion force by optimizing the motion parameters of the caudal fin in a certain range. Lastly, through the mathematical model analysis of the tail of the swordfish, the producing propulsive force principle of the caudal fin and the caudal peduncle was obtained. Hence, the proposed method provided a theoretical basis for the design of a high-efficiency bionic propulsion system.

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Axial systems and their actuation: new twists on the ancient body of craniates

Schilling

Long

2014

Zoology

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Craniate animals--vertebrates and their jawless sister taxa--have evolved a body axis with powerful muscles, a distributed nervous system to control those muscles, and an endoskeleton that starts at the head and ends at the caudal fin. The body axis undulates, bends, twists, or holds firm, depending on the behavior. In this introduction to the special issue on axial systems and their actuation, we provide an overview of the latest research on how the body axis functions, develops, and evolves. Based on this research, we hypothesize that the body axis of craniates has three primary, post-cranial modules: precaudal, caudal, and tail. The term "module" means a portion of the body axis that functions, develops, and evolves in relative independence from other modules; "relative independence" means that structures and processes within a module are more tightly correlated in function, development, and behavior than the same processes are among modules.

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Computational and mathematical modeling of the effects of tailbeat frequency and flexural stiffness in swimming fish

Cited by 5 publications

References 13 publications

Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

The Analysis of Biomimetic Caudal Fin Propulsion Mechanism with CFD

Axial systems and their actuation: new twists on the ancient body of craniates

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