A Stiffness Adjustment Mechanism Based on Negative Work for High-efficient Propulsion of Robotic Fish

Dong, Xu; Zeng, Haining; Peng, Xiang; Zhao, Ziqing; Liu, Jingmeng

doi:10.1007/s42235-018-0021-0

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…the relationship between stiffness and negative work [189]. The result shows that energy consumption during fish swimming is reduced and the propulsion efficiency is improved.…”

Section: Fin Research Types Research Contentsmentioning

confidence: 95%

Research Development on Fish Swimming

Jiang

2022

Chin. J. Mech. Eng.

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Fishes have learned how to achieve outstanding swimming performance through the evolution of hundreds of millions of years, which can provide bio-inspiration for robotic fish design. The premise of designing an excellent robotic fish include fully understanding of fish locomotion mechanism and grasp of the advanced control strategy in robot domain. In this paper, the research development on fish swimming is presented, aiming to offer a reference for the later research. First, the research methods including experimental methods and simulation methods are detailed. Then the current research directions including fish locomotion mechanism, structure and function research and bionic robotic fish are outlined. Fish locomotion mechanism is discussed from three views: macroscopic view to find a unified principle, microscopic view to include muscle activity and intermediate view to study the behaviors of single fish and fish school. Structure and function research is mainly concentrated from three aspects: fin research, lateral line system and body stiffness. Bionic robotic fish research focuses on actuation, materials and motion control. The paper concludes with the future trend that curvature control, machine learning and multiple robotic fish system will play a more important role in this field. Overall, the intensive and comprehensive research on fish swimming will decrease the gap between robotic fish and real fish and contribute to the broad application prospect of robotic fish.

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“…the relationship between stiffness and negative work [189]. The result shows that energy consumption during fish swimming is reduced and the propulsion efficiency is improved.…”

Section: Fin Research Types Research Contentsmentioning

confidence: 95%

Research Development on Fish Swimming

Jiang

2022

Chin. J. Mech. Eng.

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“…Planar model [7] Hyper redundant serial-parallel mechanisms Multi-layer composite fin [8] Electro rheological fluid core Fish-inspired physical model [9] Bilateral contract Novel propulsion mechanism [10] Fin with a variable effective length spring Redundant planar rotational parallel mechanisms [11] Antagonistic flexible elements Adjustment mechanism [12] Negative work for high-efficient propulsion…”

Section: Program Methodsmentioning

confidence: 99%

“…Scholars have proposed multiple ways to alter the stiffness of bionic fish [7][8][9][10][11][12] and have proposed a variety of methods to achieve variable stiffness, as Table 1 shows. Zuo [7] proposed a planar model of oscillatory propulsor with variable stiffnesses using hyperredundant serial-parallel mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on the Coupling Relationship between Fishtail Stiffness and Undulatory Frequency

et al. 2022

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Fish can swim in a variety of states. For example, they look flexible and perform low-frequency undulatory locomotion when cruising, but they seem very powerful and stiff and perform high-frequency undulatory when hunting. In the process of changing the motion state, the stiffness of the fish body affects the swimming performance of the fish. In this article, we imitated the change of stiffness by superimposing rubber sheets and used experimental methods to test its swimming performance under different swing frequencies. A series of rubber fish tails were made according to the analysis of the swimming movement of real fish, providing different stiffness values and changing the curves of the body. In the prototype experiments, the base of the fish tail was fixed to a platform via a force sensor, which can oscillate at various speeds, so that the fish tail was able to swing and the thrust could be tested at different frequencies. According to the experimental results, we found that with the change of the swing frequency, there were different optimal stiffnesses that could make the thrust reach the maximum value, and with the increase of stiffness, the envelope interval of the swing curve gradually widened, the amplitude increased, and the hysteresis of the tail fin relative to the end decreased.

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“…NSLSs have potential applications in various areas, such as vibration control [26][27][28][29][30][31], wave propagation control [32][33][34][35], energy absorption [8,[36][37][38][39][40][41][42][43][44][45], actuation [46,47], energy harvesting [48,49], and deployable structures [50][51][52]. Current research suggests that mechanical metamaterials capable of generating large strains have excellent bandgap tuning capabilities [53][54][55], indicating that the nonlinear behavior of NSLSs makes them an ideal candidate for producing tunable elastic metamaterials.…”

Section: Introductionmentioning

confidence: 99%

A Novel 3D-Printed Negative-Stiffness Lattice Structure with Internal Resonance Characteristics and Tunable Bandgap Properties

Liu,

2023

Materials

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The bandgap tuning potential offered by negative-stiffness lattice structures, characterized by their unique mechanical properties, represents a promising and burgeoning field. The potential of large deformations in lattice structures to transition between stable configurations is explored in this study. This transformation offers a novel method for modifying the frequency range of elastic wave attenuation, simultaneously absorbing energy and effectively generating diverse bandgap ranges. In this paper, an enhanced lattice structure is introduced, building upon the foundation of the normal negative-stiffness lattice structures. The research examined the behavior of the suggested negative-stiffness lattice structures when subjected to uniaxial compression. This included analyzing the dispersion spectra and bandgaps across different states of deformation. It also delved into the effects of geometric parameter changes on bandgap properties. Furthermore, the findings highlight that the normal negative-stiffness lattice structure demonstrates restricted capabilities in attenuating vibrations. In contrast, notable performance improvements are displayed by the improved negative-stiffness lattice structure, featuring distinct energy band structures and variable bandgap ranges in response to differing deformation states. This highlights the feasibility of bandgap tuning through the deformation of negatively stiffened structures. Finally, the overall metamaterial structure is simulated using a unit cell finite element dynamic model, and its vibration transmission properties and frequency response patterns are analyzed. A fresh perspective on the research and design of negative-stiffness lattice structures, particularly focusing on their bandgap tuning capabilities, is offered in this study.

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A Stiffness Adjustment Mechanism Based on Negative Work for High-efficient Propulsion of Robotic Fish

Cited by 16 publications

References 24 publications

Research Development on Fish Swimming

Research Development on Fish Swimming

Experimental Research on the Coupling Relationship between Fishtail Stiffness and Undulatory Frequency

A Novel 3D-Printed Negative-Stiffness Lattice Structure with Internal Resonance Characteristics and Tunable Bandgap Properties

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