Dataset Information

Vibration-Induced-Flow Mechanism and Its Application in Water Surface Robot.

ABSTRACT: Vibration is a common strategy for aquatic organisms to achieve their life activities, especially at the air-water interface. For the locomotion of small creatures, the organs with plate features are often used on water surfaces, which inspires relevant studies about using thin plates for robot propulsions. However, the influence of the general deformations of thin plates on the generated flow fields has not been considered. Here, a comprehensive investigation is conducted about the flow fields that arose by vibrations of thin plates and the potential as locomotion strategies are explored. It is discovered that as thin plates are subjected to vibration excitations on the water surface, the produced flow fields are mainly determined by the vibration shapes, and the influence rules of plate deformations on the flow fields are identified. The main factors producing asymmetric flow fields are analyzed to realize the morphology control of the flow fields. Then, to determine effective locomotion strategies on the water surface, the flow fields stimulated by integrated vibration exciters are explored, and 2 water surface robots are developed consequentially, which exhibit superior motion performance. This work reveals the basic rules of the vibration-induced-flow mechanism by thin plates and establishes new locomotion strategies for aquatic robots.

SUBMITTER: Wang D

PROVIDER: S-EPMC11312888 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature

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Vibration-Induced-Flow Mechanism and Its Application in Water Surface Robot.

Wang Dehong D Zhang Shijing S Li Jing J He Haoxuan H Chen Weishan W Liu Junkao J Zhao Jie J Deng Jie J Liu Yingxiang Y

Research (Washington, D.C.) 20240809

Vibration is a common strategy for aquatic organisms to achieve their life activities, especially at the air-water interface. For the locomotion of small creatures, the organs with plate features are often used on water surfaces, which inspires relevant studies about using thin plates for robot propulsions. However, the influence of the general deformations of thin plates on the generated flow fields has not been considered. Here, a comprehensive investigation is conducted about the flow fields ...[more]

PMID: 39130492

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Project description:A longer on-land rearing period of Gilthead seabream Sparus aurata before transfer to sea-cages would allow the farmer to benefit from exercise-enhanced growth and resilience as induced by increasing water flow in the tanks. In this study, the physiological effects of flow-conditioning were investigated by subjecting large groups of experimental fish to minimal flow or to flow regimes inducing swimming exercise at 1 or 2 Body Length (BL) s-1 for a period of 8 months (Feb.-Oct.) in 1,500 l RAS tanks. Fish size after eight months of flow conditioning was 92 ± 27 g body weight (BW) for fish under minimal flow; 106 ± 24 g BW (+15%) at 1 BL s-1, and 125 ± 27 g BW (+36%) at 2 BL s-1. Although flow enhanced growth linearly with swimming speed, the number of malformed fish was significantly higher for swimming at 2 BL s-1 indicating that the mechanical load imposed by exercise was too high for a developing juvenile. Fish representing the three treatment groups were then used for: (1) a stress challenge netting test and plasma cortisol measurement (baseline, peaking and recovery levels); (2) blood plasma measurements of glucose, triglycerides, lactate, cholesterol, growth hormone (GH) and insulin-like growth factor I (IGF-I), and heart and muscle gene expression of the GH and IGF-I receptors and the muscle transcriptome by deep RNA sequencing (RNAseq). Flow conditioning at 1 BL s-1 provided optimal conditions for growth and stress coping without energetic depletion and morphological deformation. The absence of important differences in plasma GH and IGF-I, and expression levels of the receptors in heart and white skeletal muscle, indicated that other factors may be involved in growth enhancement. RNAseq of the white skeletal muscle showed that transcription regulators play an important role. Also expression of immune genes is strongly up-regulated. Whereas muscle of fish conditioned at 1 BL s-1 shows up-regulated expression of structural genes such as troponins and myosins, muscle of fish conditioned at 2 BL s-1 shows up-regulated expression of skeletal genes instead which may reflect the mechanism behind morphological deformations.

Dataset Information

Vibration-Induced-Flow Mechanism and Its Application in Water Surface Robot.

Publications

Vibration-Induced-Flow Mechanism and Its Application in Water Surface Robot.

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