Asymmetry Control of Wing Stroke Amplitudes for Rotational Torque Generation

Takagi, Motoki; Kawabe, Masayoshi; Fujita, Ayumi; Yimit, Adiljan; Nishimura, Futoshi; Hagihara, Yoshihiro; Miyoshi, Tasuku

doi:10.5226/jabmech.3.97

Cited by 3 publications

(6 citation statements)

References 8 publications

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“…3 , 4 ). The amplitude of the force acting on the stingray is expected to affect the oscillation of the ray's swimming motion 18 . Therefore, a small amplitude of the acting force predicts a small amount of body oscillation during swimming.…”

Section: Discussionmentioning

confidence: 99%

“…The pufferfish can swim with maneuverability and stability by the vortices generated by its body and the way it moves its fins 15 – 17 . In insects and rajiform and mobuliform rays, stability has been shown to be affected by changes in the amplitude and speed of the left and right pectoral fin movements and the bending angle of the pectoral fins 13 , 14 , 18 – 20 . Although these previous studies were based on the assumption of turning, the amplitude and speed difference of the left and right pectoral fin movements are expected to maintain posture effectively even during straight-line swimming.…”

Section: Introductionmentioning

confidence: 99%

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Changes in rays’ swimming stability due to the phase difference between left and right pectoral fin movements

Sumikawa

Naraoka

Fukue

et al. 2022

Sci Rep

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Swimming motions of rays that swim using undulation locomotion are not always symmetrical; there may be a phase difference between the left and right pectoral fins. However, few studies on the swimming of rays have mentioned left and right pectoral fin movements. Moreover, the effects of movements of the left and right pectoral fins on swimming have not been clarified. This paper describes a computational study of phase differences of pectoral fin movements in the swimming of rays with the validity of fluid analysis methods. The movement and shape of the ray were made based on previous biological research and pictures. An overset grid was used to reproduce the ray’s complex motions. The analysis was performed under four phase difference conditions: 0 $$T$$ T ($$T$$ T is the period), 0.25 $$T$$ T , 0.5 $$T$$ T , and 0.75 $$T$$ T . The results show that a phase difference between the left and right pectoral fin movements affects swimming stability and maneuverability but not propulsive efficiency. We suggest that the phase difference in pectoral fin movements is essential for the swimming of rays, and rays adjust the phase difference between the movement of the left and right pectoral fins to suit their purpose.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes in rays’ swimming stability due to the phase difference between left and right pectoral fin movements

Sumikawa

Naraoka

Fukue

et al. 2022

Sci Rep

Self Cite

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“…The generation of the pitching moment was demonstrated by changing the amplitude of flapping using a two-wing flapping model [6]. We also conducted research on the generation of roll and yaw moments in a two-wing model and clarified that the wingbeat amplitude affects the moment that acts on the COG [7][8]. On the contrary, studies on the generation of moments during attitude control in a four-wing model as compared to the two-wing model are few.…”

Section: Introductionmentioning

confidence: 99%

Handling parameters for rotational moment generation with four-wing flapping

2018

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The aim of this study was to clarify the relationships between pitch, roll, and yaw moments during flapping and various handling parameters ((i) wingbeat amplitude, (ii) stroke plane angle, and (iii) asymmetry of the flapping duration). We investigate the effects of the combination of (i) and (ii), or the combination of (i) and (iii) for generating rotational moments. The results demonstrated that flapping amplitudes and asymmetry contributed to generating pitch and roll moments, and flapping amplitude and tilt angle affected the generation of all moments.

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“…As indicated in [13], by generating different flapping amplitudes, the roll moment could be generated.…”

Section: Bmentioning

confidence: 99%

“…In these respects, the insects control the yaw moment as well as the roll moment with a steering muscle [12]. We have concentrated on the mechanism of the steering muscle that was seen in insects for controlling the amplitude of flapping wings to generate the roll moment [13]. As reported in this paper, we have developed a new flapping device, which was allowed to control the flapping amplitude to produce roll and yaw moments.…”

Section: Introductionmentioning

confidence: 99%