Experimental study on noise reduction of multi-rotor by phase synchronization

Shao, Mengxue; Lu, Yang; Xu, Xice; Guan, Shujun; Lu, Jiaxin

doi:10.1016/j.jsv.2022.117199

Cited by 10 publications

(1 citation statement)

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“…These propeller-driven vehicles also do not offer any possibility of noise reduction via coordinated motion between multiple vehicles. Although previous experiments have shown the possibility of reducing the noise of a multi-rotor vehicle by synchronizing the rotation phase [23], phase synchronization among multiple vehicles can be hardly achieved due to the high rotational speed and unsteady relative distances among individuals. On the other hand, bioinspired AUVs (BAUVs) that employ flapping fin-like propulsors might offer such a possibility, and the current study is motivated to a large extent by considerations related to the design and operation of BAUVs that could enable these machines to operate with reduced acoustic noise radiation, while at the same time maintaining their propulsive performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of schooling on flow generated sounds from carangiform swimmers

Zhou,

Seo,

Mittal

2024

Bioinspir. Biomim.

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Computational models are used to examine the effect of schooling on flow generated noise of fish swimming using their caudal fins. We simulate the flow as well as the far-field hydrodynamic sound generated by the time-varying pressure loading on these carangiform swimmers. The effect of the number of swimmers in the school, the relative phase of fin flapping of the swimmers, and their spatial arrangement is examined. The simulations indicate that the phase of the fin flapping is a dominant factor in the total sound radiated into the far-field by a group of swimmers. For small schools, a suitable choice of relative phase between the swimmers can significantly reduce the overall intensity of the sound radiated to the far-field. The relative positioning of the swimmers is also shown to have an impact on the total radiated noise. For a larger school, even highly uncorrelated phases of fin movement between the swimmers in the school are very effective in significantly reducing the overall intensity of sound radiated into the far-field. The implications of these findings for fish ethology as well as the design and operation of bioinspired vehicles are discussed.

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Section: Introductionmentioning

confidence: 99%