On the sonic composites without/with defects

Chiroiu, Veturia; Brişan, Cornel; Popescu, Mihaela; Girip, Iulian; Munteanu, Ligia

doi:10.1063/1.4828475

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…When no defects into the sonic plate, the frequencies are not affected by variations of the lattice constant, this suggests that they are entirely due to local effects within the individual scatterers [3,4].…”

Section: Resultsmentioning

confidence: 99%

Localized modes at defects in sonic composites

Mosnegutu

2016

Proc Appl Math and Mech

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The paper discusses a sonic composite consisting of an array of silicone rubber coated hollow steel cylinders embedded in an epoxy matrix, with linear defects. Such structures allow localization of modes in the vicinity of the line defect with propagation along this line. The material in the vicinity of the line behaves like frequency-specific mirrors. The mirrors localize waves within a finite region of the line defect, and modes are quantized into discrete frequencies.

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Section: Resultsmentioning

confidence: 99%

Localized modes at defects in sonic composites

Mosnegutu

2016

Proc Appl Math and Mech

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“…Information theory and its measures play important roles in different areas; the study of wave propagation in different domains (high energy physics, sonoelasticity, signal processing, etc.) requires much information to be processed [9,10]. This Big Data collection often has no practical use unless analyzed effectively to discover qualitative data and meaningful patterns and hierarchies.…”

Section: Introductionmentioning

confidence: 99%

A new upper bound for Shannon entropy. A novel approach in modeling of Big Data applications

Popescu

Sluşanschi

Iancu

et al. 2014

Concurrency and Computation

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Analyzing data type produced, stored, and aggregated in Big Data environments is a challenge in understanding data quality and represents a crucial support for decisionmaking. Big Data application modeling requires meta-data modeling, interaction modeling, and execution modeling. Entropy, relative entropy, and mutual information play important roles in information theory. Our purpose within this paper is to present a new upper bound for the classical Shannon's entropy. The new bound is derived from a refinement of a recent result from the literature, the inequality of S. S. Dragomir (2010). The reasoning is based on splitting the considered interval into the mentioned inequality. The upper bound can be considered in understanding the potential information that each data type may have in a Big Data environment.Then summating all m C 1 previous inequalities, we obtain D.f; p; xI J; J 1 ; J 2 ; : : : ; J m / 6 m X i D1

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“…The evanescent waves are distributed across the boundary of the waveguide into the surrounding composite. [2][3][4] A review focusing on the fundamental physical aspects of the sonic materials was reported by Miyashita. 5 The sound attenuation band connected to a large acoustic impedance ratio of the matrix and scatterers materials is reported by experimental and theoretical works of Gupta and Ye, 6 S achez-P erez et al, 7 Vasseur et al, 8 Kafesaki and Economou, 9 Psarobas et al, 10 Mart ınez-Sala et al, 11 and Liu et al 12 The plane wave propagation in infinite 2D periodic lattices was investigated by Phani et al 13 using the Floquet-Bloch principles.…”

Section: Introductionmentioning

confidence: 99%

A new class of sonic composites

Munteanu

Chiroiu

Donescu

et al. 2014

Journal of Applied Physics

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Articles you may be interested inOn the sonic composites without/with defects Negative Poisson's ratio and piezoelectric anisotropy of tetragonal ferroelectric single crystals Transformation acoustics opens a new avenue towards the architecture, modeling and simulation of a new class of sonic composites with scatterers made of various materials and having various shapes embedded in an epoxy matrix. The design of acoustic scatterers is based on the property of Helmholtz equations to be invariant under a coordinate transformation, i.e., a specific spatial compression is equivalent to a new material in a new space. In this paper, the noise suppression for a wide full band-gap of frequencies is discussed for spherical shell scatterers made of auxetic materials (materials with negative Poisson's ratio). The original domain consists of spheres made from conventional foams with positive Poisson's ratio. The spatial compression is controlled by the coordinate transformation, and leads to an equivalent domain filled with an auxetic material. The coordinate transformation is strongly supported by the manufacturing of auxetics which is based on the pore size reduction through radial compression molds. V C 2014 AIP Publishing LLC.

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On the sonic composites without/with defects

Cited by 10 publications

References 34 publications

Localized modes at defects in sonic composites

Localized modes at defects in sonic composites

A new upper bound for Shannon entropy. A novel approach in modeling of Big Data applications

A new class of sonic composites

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