A statistical energy analysis subsystem formulation using finite element and periodic structure theory

Cotoni, Vincent; Langley, R.S.; Shorter, Phil

doi:10.1016/j.jsv.2008.04.058

Cited by 117 publications

(84 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(8) with a set of ε x , ε y varying from 0 to 2π will suffice for capturing the entirety of the structural elastic waves. Further considerations on reducing the computational expense of the problem are discussed in [37].…”

Section: Wave Propagation and Dissipation Within The Mechanical Metammentioning

confidence: 99%

“…For this reason a wave-based statistical energy analysis scheme as exhibited in [37,38] is employed, in which the computed wavenumber and damping loss factor values for the panel are input. The major vibroacoustic index that provides an important indication of a structure's acoustic opacity properties is its sound TL.…”

Section: Calculation Of the Acoustic Transmission Through The Panelmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Chronopoulos

Antoniadis

Ampatzidis

2017

Extreme Mechanics Letters

View full text Add to dashboard Cite

a b s t r a c tDespite the fact that the concept of incorporating Negative Stiffness (NS) elements within mechanical systems was formulated and validated more than 40 years ago, it has only recently received consistent attention. In this work, the design of a layered mechanical metamaterial having implemented NS inclusions is presented and its acoustic wave propagation properties are modelled. A dedicated twodimensional periodic structure theory scheme is developed in order to compute the frequency dependent damping loss factor of the metamaterial structure. The acoustic transmission properties through the modelled panel are computed within a Statistical Energy Analysis (SEA) scheme. It is demonstrated that the suggested layered metamaterial exhibits highly superior acoustic insulation performance close and above the acoustic coincidence range, thanks to the drastic increase of its structural damping properties implied by the NS elements. Additionally, the proposed configuration presents superior performance in a broadband frequency range when compared to a viscoelastic damping constraint layer of equivalent mass.

show abstract

Section: Wave Propagation and Dissipation Within The Mechanical Metammentioning

confidence: 99%

Section: Calculation Of the Acoustic Transmission Through The Panelmentioning

confidence: 99%

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Chronopoulos

Antoniadis

Ampatzidis

2017

Extreme Mechanics Letters

View full text Add to dashboard Cite

show abstract

“…Then, a sound wave transfer matrix [A] with N layers of homogenous materials for each transfer matrix is obtained, as shown in Equation (5), where k represents the wave number, c ρ denotes the impedance, and l represents the thickness. The goal of research concerning this type of anechoic frequency pattern is to decrease the reflected absorption peak caused by the inconsistent impedance of the structural design, and the effect that broadens the sound absorption frequency domain has been reported [22,23]. However, these studies have generally treated the structures in each layer as isotropic homogenous materials and assumed that the interface phases between the layers were the ideal phase, which is contradictory.…”

Section: Impedance-grade Multi-layer Composite Anechoic Structuresmentioning

confidence: 99%

Review on Multi-scale Structural Design of Submarine Stealth Composite

Qian¹,

Li²

2017

dtetr

View full text Add to dashboard Cite

Research on the acoustic stealth structures of submarines primarily strives for low frequency, pressure resistance, and broad frequency domain absorption. The high-quality acoustic stealth coating on submarines is a complicated Multi-scale and multi-component structure, which consists of numerous macro-structures, such as acoustic air-filled cavities, laminated structures, filling components, and micro-phase structures. However, more information regarding how these components with different anechoic mechanisms obtain good results through synergistic work and how their absorption frequencies superpose effectively to realize acoustic stealth in a broad frequency domain is necessary. Understanding these mechanisms is essential to design a novel anechoic structure in a broad frequency domain. Thus, in this paper, research concerning these mechanisms was reviewed. In addition, the design methods and anechoic mechanism of anechoic structures were discussed for different levels, and the primary concerns in this field were summarized. Several suggestions were made for further research.

show abstract

“…Therefore, the radiation efficiency expression given in [17] can be used. In the next chapter the equations used to calculate the STL, modal density and radiation efficiency are presented.…”

Section: Calculation Of the Radiation Efficiencymentioning

confidence: 99%

“…In [16] the authors used Spectral Finite Element (SFE) to predict the wave propagation characteristics, overcoming the thresholds of CLPT. In [17] the phase constant surfaces of periodic composite and stiffened structures was examined taking advantage of the periodicity using Periodic Structure Theory (PST) and Finite Elements (FE).…”

mentioning

confidence: 99%

Acoustic transmission properties of pressurised and pre-stressed composite structures

Ampatzidis

Chronopoulos

2016

Composite Structures

View full text Add to dashboard Cite

This work was focused on the examination of the effect of the pre-stress, namely tension and pressure, on the wave propagation and acoustic behaviour of composite laminates. The dispersion characteristics of two dimensional layered and sandwich structures were predicted using Wave Finite Element Method (WFEM). The structures were examined in non-stressed and pre-stressed scenarios. After extracting the mass and stiffness matrix of a small periodic segment of the structure using commercially available Finite Elements software, a polynomial eigenvalue problem was formed, the solutions of which consisted of the propagation constants of the waves of the structure. This way the wavenumbers and eigenvectors of the out of plane structural displacements were extracted. These wave propagation magnitudes were then used to calculate important Statistical Energy Analysis (SEA) quantities, such as modal density and radiation efficiency. The effect of pre-stress on these quantities, along with its effect on loss factor of the structure were examined.

show abstract

A statistical energy analysis subsystem formulation using finite element and periodic structure theory

Cited by 117 publications

References 25 publications

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Enhanced acoustic insulation properties of composite metamaterials having embedded negative stiffness inclusions

Review on Multi-scale Structural Design of Submarine Stealth Composite

Acoustic transmission properties of pressurised and pre-stressed composite structures

Contact Info

Product

Resources

About