Damping of flexural vibrations in turbofan blades using the acoustic black hole effect

Bowyer, E.P.; Krylov, Victor V.

doi:10.1016/j.apacoust.2013.09.009

Cited by 71 publications

(27 citation statements)

References 7 publications

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“…11. Steel (a) and composite (b) plates containing slots of power-law profile [27] Following the idea first proposed in [4], experimental investigations into damping of flexural vibrations in turbofan blades with trailing edges tapered according to a power-law profile have been carried out in the papers [32,33]. Obviously, wedges of power-law profile fit naturally with a fan blade geometry (see Fig.…”

Section: Some Other Acoustic Black Hole Configurations and Applicamentioning

confidence: 99%

Acoustic black holes: recent developments in the theory and applications

Krylov

2014

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

101

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Section: Some Other Acoustic Black Hole Configurations and Applicamentioning

confidence: 99%

Acoustic black holes: recent developments in the theory and applications

Krylov

2014

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

101

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“…Consequently, the waves take an infinite time to reach the zerothickness edge and do not reflect back, resulting in an acoustic black hole. Further development 2 and experimental work 3 has been performed, including ABH implementation in structures, 4,5 sound radiation, 6 and energy harvesting. 7 However, there is still a need to systematically understand the limitations and assumptions of the theory for the design, optimization, and implementation of ABHs in real structural systems.…”

Section: Introductionmentioning

confidence: 99%

A normalized wave number variation parameter for acoustic black hole design

Feurtado

Conlon

Semperlotti

2014

The Journal of the Acoustical Society of America

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In recent years, the concept of the Acoustic Black Hole has been developed as an efficient passive, lightweight absorber of bending waves in plates and beams. Theory predicts greater absorption for a higher thickness taper power. However, a higher taper power also increases the violation of an underlying theory smoothness assumption. This paper explores the effects of high taper power on the reflection coefficient and spatial change in wave number and discusses the normalized wave number variation as a spatial design parameter for performance, assessment, and optimization.

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“…An experimental work of damping of flexural vibrations in turbofan blades using ABH was studied by Bowyer and Krylov [46]. Figure 18a shows the fan blade profile with a tapered ABH geometry.…”

Section: Vibration Damping Of Turbofan Blades With Abhmentioning

confidence: 99%

“…Acceleration for a twisted reference blade (dashed line) compared to a twisted blade with a 1D ABH and damping layer (solid line). Reprinted from[46] under a CC BY 3.0 license. Copyright Bowyer, E.P.…”

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confidence: 99%

Acoustic Black Holes in Structural Design for Vibration and Noise Control

Zhao

Prasad

2019

Acoustics

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It is known that in the design of quieter mechanical systems, vibration and noise control play important roles. Recently, acoustic black holes have been effectively used for structural design in controlling vibration and noise. An acoustic black hole is a power-law tapered profile to reduce phase and group velocities of wave propagation to zero. Additionally, the vibration energy at the location of acoustic black hole increases due to the gradual reduction of its thickness. The vibration damping, sound reduction, and vibration energy harvesting are the major applications in structural design with acoustic black holes. In this paper, a review of basic theoretical, numerical, and experimental studies on the applications of acoustic black holes is presented. In addition, the influences of the various geometrical parameters and the configuration of acoustic black holes are presented. The studies show that the use of acoustic black holes results in an effective control of vibration and noise. It is seen that the acoustic black holes have a great potential for quiet design of complex structures.

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Damping of flexural vibrations in turbofan blades using the acoustic black hole effect

Cited by 71 publications

References 7 publications

Acoustic black holes: recent developments in the theory and applications

Acoustic black holes: recent developments in the theory and applications

A normalized wave number variation parameter for acoustic black hole design

Acoustic Black Holes in Structural Design for Vibration and Noise Control

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