Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin

CUI Zuo; JIANG Hong-zhou

doi:10.11993/j.issn.2096-3920.2020.02.001

Volume 28 Issue 2

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CUI Zuo, JIANG Hong-zhou. Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin[J]. Journal of Unmanned Undersea Systems, 2020, 28(2): 119-125. doi: 10.11993/j.issn.2096-3920.2020.02.001

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CUI Zuo, JIANG Hong-zhou. Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin[J]. Journal of Unmanned Undersea Systems, 2020, 28(2): 119-125. doi: 10.11993/j.issn.2096-3920.2020.02.001

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Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin

doi: 10.11993/j.issn.2096-3920.2020.02.001

CUI Zuo¹,
JIANG Hong-zhou²

1.
School of Aerospace Engineering, Guizhou Institute of Technology, Guiyang 550003, China
2.
School of Mechatronic Engineering, Harbin Institute of Technology, Harbin 150001, China

Received Date: 2019-07-04
Rev Recd Date: 2019-08-16
Publish Date: 2020-04-30

Abstract

Abstract

In nature, the majority of fishes obtain their extraordinary swimming abilities of fast speed and high efficiency by propagating their midline motions backward. In this paper, the midline motions and their complex modal characteristics are analyzed by the method of complex orthogonal decomposition(COD). From the perspective of modal analysis, the movement of a swimming fish is in essence the forced vibration of viscoelastic body in fluid environment, and the motions are of complex modal shapes. According to the COD method, the midline motions are decomposed into the travelling and standing components. The correlation coefficient of the real and imaginary parts of complex modal shape is used to define the travelling index. Based on the analysis of the motions of two kinds of anguilliform fish(Pholis Laeta) and subcarangiform fish(Rainbow Trout), the travelling indexes of their midline motions are 0.793 and 0.604, respectively. It is shown that the midline motions of Pholis Laeta contain a large proportion of travelling wave, while the midline motions of Rainbow trout contain a larger proportion of standing wave. These biological results verify the complex modal characteristics of the midline motions, and the complex modal characteristics have close relation to the dynamic properties of fish body and the swimming patterns.
- fish,
- swimming pattern,
- midline motions,
- complex modal decomposition,
- travelling index

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References(23)

References

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Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin

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Complex Modal Decomposition and Characteristics Analysis of the Midline Motions of Swimming Fish Propelled by Undulating Body and Caudal Fin

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