Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one- and two-dimensional acoustic black holes

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

doi:10.1016/j.compstruct.2013.08.011

Cited by 94 publications

(53 citation statements)

References 10 publications

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“…its rigidity. First experimental investigations of two-dimensional acoustic black holes in different types of plates have been carried out in [18][19][20].…”

Section: Two-dimensional Acoustic Black Holes For Flexural Wavesmentioning

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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“…its rigidity. First experimental investigations of two-dimensional acoustic black holes in different types of plates have been carried out in [18][19][20].…”

Section: Two-dimensional Acoustic Black Holes For Flexural Wavesmentioning

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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“…The sound power level (in dB) and the radiated sound power (in Watts) were calculated. It has been shown in the earlier publication that the addition of a thin visco-elastic layer to the indentation' tip, when a central hole is present, considerably increases the damping performance of the indentation of power-law profile 11 . It was therefore expected that the addition of such a damping layer to the indentation tip will also reduce the sound radiated from the vibrating plate.…”

Section: Sound Radiation Of a Steel Plate Containing Six Circular Indmentioning

confidence: 99%

“…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

2013

Proceedings of Meetings on Acoustics

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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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“…al 2014 investigates the nonlinear dynamic response of a hybrid laminated composite plate composed of composite material such as basalt, Kevlar/epoxy and Eglass/ epoxy under the blast load with damping effects. [32] von Kármán type of geometric nonlinearities are considered and parameters such as damping ratios, aspect ratios and different peak pressure values are analyzed Bowyer and Kyyov experimentally investigate the indentation of power law profile for honeycomb sandwich panels. [33]It has found that for higher order acoustic black holes for flexural waves that can absorb a large fraction of the incident wave energy.…”

confidence: 99%

Free and forced vibration of a laminate structure with different material configuration & angle orientation by using finite element analysis Free and forced vibration of a laminate structure with different material configuration & angle orientation by using finite element analysis

Landge¹

2017

IJRASET

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I. INTRODUCTION A. What is a composite Material?A broad definition of composite is: Two or more chemically distinct materials that when combined has improved properties over individual materials. The composites may be either natural or synthetic. B. ApplicationThe glass-reinforced polyester has all the properties that make it ideal for this purpose and has become the standard material. Laminated plywood panels with thin layer of reinforced plastic are also widely used in truck trolleys. Various methods are used to produce them and the low cost, and the strength offered by the plywood that is attractive. They may not be as light as desired, but are found to be considerably more durable than conventional constructions, particularly under heavy duty conditions. There is also a growing market for products such as vans and trailers that are made from glass-reinforced plastic at competitive prices. Vehicles destined for consumer markets tend to be attractively designed, their appearance is different and the tools are easy. Mold reinforced plastic of the full size model of the piece are taken. The pattern can be made of wood, clay or plaster. The automotive sheet body is molded into molding molds paired with glass fiber or wick as reinforcements. Large and complex pieces can be produced and their reproduction can be made equally fast. Parts made using this technique generally have a uniform thickness, because the additional reinforcing fibers cannot be loaded easily or accurately. Composite molding materials are used when small rigid parts have to be made and are usually prepared by casting. The bulk molding compound is composed of polyester resin, glass fibers and filler. The strength is less than that obtained by other molding processes. The molding compounds may be prepared as continuous sheets. Due to the longer fibers and a high glass content, its strength is better than those made in the bulk molding method. Injection molding are used to some extent to produce materials that can be applied to structural materials. After the separate manufacture of parts by molding or other methods, the assembly of the vehicle body has to be made. Tools and accessories similar to those used in metal parts are used for drilling and drilling operations. The assembly of several parts is usually accomplished by adhesion, using resins that are catalyzed to cure at room temperature in a short time. A good bonding strength is achieved even without pressure, although fastening devices are required to locate the assembled parts correctly in relation to each other. High-build primers are used to give a high-gloss finish so that surface imperfections do not become obvious. Commercial aircraft applications are the most important uses of the compounds. Aircraft, unlike other vehicles, need to place greater emphasis on safety and weight. They are achieved using

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Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one- and two-dimensional acoustic black holes

Cited by 94 publications

References 10 publications

Acoustic black holes: recent developments in the theory and applications

Acoustic black holes: recent developments in the theory and applications

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

Free and forced vibration of a laminate structure with different material configuration & angle orientation by using finite element analysis Free and forced vibration of a laminate structure with different material configuration & angle orientation by using finite element analysis

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