Point mobility of a cylindrical plate incorporating a tapered hole of power-law profile

O'Boy, Daniel; Bowyer, E.P.; Krylov, Victor V.

doi:10.1121/1.3585844

Cited by 37 publications

(18 citation statements)

References 23 publications

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“…Other important structures that have been investigated at Loughborough were rectangular plates with tapered indentations (pits) of power-law profile drilled inside the plates [27][28][29][30]. In black holes for flexural waves.…”

Section: B Plates Containing Two-dimensional Acoustic Black Holesmentioning

confidence: 99%

“…Theoretical and experimental investigations have been carried out for a specific case of circular indentations of power-law profile drilled in the centre of a circular plate [27,28]. The advantage of this geometrical configuration is that it facilitates theoretical calculations of the frequency response functions.…”

Section: B Plates Containing Two-dimensional Acoustic Black Holesmentioning

confidence: 99%

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Acoustic black holes: recent developments in the theory and applications

Krylov

2014

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

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101

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Section: B Plates Containing Two-dimensional Acoustic Black Holesmentioning

confidence: 99%

Section: B Plates Containing Two-dimensional Acoustic Black Holesmentioning

confidence: 99%

Acoustic black holes: recent developments in the theory and applications

Krylov

2014

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

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101

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“…With a tailored power-law thickness variation, the phase velocity of the bending wave gradually reduces to zero in the ideal scenario, resulting in zero wave reflection and high energy concentration at the wedge tip [1][2][3]. ABH effect attracts increasing attention as a promising passive vibration control method because vibration energy can be channeled and only a very small amount of damping materials is required at the energy focalization region to achieve efficient damping to flexural waves [4][5][6][7][8][9]. It also shows appealing potential in sound radiation control [10,11] and energy harvesting [12,13] due to the high energy concentration within a confined area.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Tang

2017

Journal of Sound and Vibration

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The phenomenon of Acoustics Black Hole (ABH) benefits from the bending wave propagating properties inside a thin-walled structure with power-law thickness variation to achieve zero reflection when the structural thickness approaches zero in the ideal scenario.However, manufacturing an ideally tailored power-law profile of a structure with embedded ABH feature can hardly be achieved in practice. Past research showed that the inevitable truncation at the wedge tip of the structure can significantly weaken the expected ABH effect by creating wave reflections. On the premise of the minimum achievable truncation thickness by the current manufacturing technology, exploring ways to ensure and achieve better ABH effect becomes important. In this paper, we investigate this issue by using a previously developed wavelet-decomposed semi-analytical model on an Euler-Bernoulli beam with a modified power-law profile and an extended platform of constant thickness. Through comparisons with the conventional ABH profile in terms of system loss factor and energy distribution, numerical results show that the modified thickness profile brings about a systematic increase in the ABH effect at mid-to-high frequencies, especially when the truncation thickness is small and the

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“…The key advantage of the acoustic black hole effect is a significant reduction in added masses of absorbing materials required, as only sharp edges of tapered plate (wedge) should have small pieces of absorbing materials applied. Recent developments in this area considered structures with both one-dimensional acoustic black holes (wedges of power-law profile attached to plate edges) 7,8 and two-dimensional acoustic black holes (circular indentations of power-law profile drilled inside plates) [9][10][11][12][13][14][15] . The present paper describes the results of the first experimental investigation of sound radiation from vibrating plates containing two-dimensional acoustic black holes (circular indentations of power-law profile).…”

Section: Introductionmentioning

confidence: 99%

Sound radiation of rectangular plates containing tapered indentations of power-law profile

Bowyer

Krylov

2012

The Journal of the Acoustical Society of America

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In this paper, the results of the experimental investigations into the sound radiation of vibrating rectangular plates containing tapered indentations of power-law profile are reported. Such tapered indentations materialise two-dimensional acoustic black holes for flexural waves that result in absorption of a large proportion of the incident flexural wave energy and, therefore, cause efficient damping of plate's flexural vibrations. A multi-indentation plate was compared to a plain reference plate of the same dimensions, and the radiated sound power was determined in accordance with ISO 3744. It was demonstrated that not only do such multiple indentations provide substantial reduction in damping of flexural vibrations within the plate, but also cause a substantial reduction in the radiated sound power. This paper also considers the effect of distribution of the plate's vibrational response on the amplitudes of the radiated sound. It is shown that, despite an increase in the amplitudes of displacements at the indentations' tips, the overall reduction in vibration level over the plate is large enough to result in substantial reduction in the radiated sound power.

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Point mobility of a cylindrical plate incorporating a tapered hole of power-law profile

Cited by 37 publications

References 23 publications

Acoustic black holes: recent developments in the theory and applications

Acoustic black holes: recent developments in the theory and applications

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Sound radiation of rectangular plates containing tapered indentations of power-law profile

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