Design of a single layer micro-perforated sound absorber by finite element analysis

Onen, Onursal; Çalışkan, Mehmet

doi:10.1016/j.apacoust.2009.07.012

Cited by 21 publications

(11 citation statements)

References 12 publications

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“…The size, distribution, and homogeny of voids in such composites, particle sizes of contributing materials, densities, thickness and backing materials, if used, were reported to be governing factors [1,[8][9][10]. Composites having multiple layers in different shapes at interfaces were also studied in detail in respect to sound absorption capacities [11,12]. In general, porous single and multilayered composite materials containing mineral fibers, glass or rock wool embedded in various resins, plastics, or polymer matrixes exhibited good sound absorption properties in the frequency range of around 500-4000 Hz.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Karademir¹,

Yenidoğan

Aydemir

et al. 2012

International Journal of Polymeric Materials

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A number of thin biocomposites were produced from waste corrugated board pulp with 15% and 30% blending of wool fibers (WF), ceramic fibers (CF), and cotton dust (CD), respectively. The highest sound absorption value was obtained from samples containing 30% wool fibers. Printability of control sheets unfortunately was remarkably damaged. Ceramic fibers improved the thermal stability of control sheets, which was followed by WF and CD. Tensile and burst indexes of samples, however, were greatly reduced. It was furthermore found that CD, CF, and WF additions increased the air permeability values of resultant papers parallel to great reduction on densities.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Karademir¹,

Yenidoğan

Aydemir

et al. 2012

International Journal of Polymeric Materials

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“…Ng and Hui (2008) proposed a new honeycomb core design by increasing the stiffness and damping to improve TL in the low-frequency range. Finite element method and shape optimization method were combined to optimize the solid-void layout of a sandwich panel for higher TL (Onen and Caliskan 2010;Chang et al 2005;Ruiz et al 2011). Hudson et al (2010 applied an ant-colony optimization algorithm to the multiple-objective optimization of a railway vehicle's floor sandwich panel.…”

Section: Introductionmentioning

confidence: 99%

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

Yoon

Lee

2016

Struct Multidisc Optim

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In this study, we optimally design the core of a metal sandwich panel used in high-speed railway vehicles to minimize the amount of metal solid in the core and subsequently reduce its weight. The optimum core must satisfy constraints regarding sound transmission class (STC) and compliance. Because the solid-void layout in the core strongly affects the acoustic and static characteristics of sandwich panels, the core layout should be carefully designed when reducing the amount of metal solid. To this end, three topology-optimization problems and one size-optimization problem are formulated and sequentially solved. A single unit cell is periodically repeated in the core. Thus, structural and acoustic topology-optimization problems are first formulated and solved for the unit cell. Based on the optimal topologies obtained for the unit cell, a moderate initial solid-void layout in the unit cell is determined for the size-optimization problem to optimally design core. The effectiveness of the current design approach for the core of the sandwich panel is validated by comparing the STC and compliance values of the optimal core design and a reference design. Nomenclature A N n¼1 finite element assembly operator Bmatrix relating the element strain vector to its nodal displacement vector C m e a nc o m p l i a n c e C ini initial mean compliance c speed of sound in air D constitutive matrix d 1 thickness of thin flat plates at both ends in a sandwich panel d 2 thickness of the bar inside a sandwich panel dis (r,m) distance between the centers of the r th and m th elements E r (χ r ) Young's modulus of the r th element

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“…The most common ones are porous and fibrous materials (foams, glass-wool, rock-wool, ...) and have therefore long been developed to enhance their acoustical performances, especially at low frequencies [1]. More recently, for example, micro-perforated panels have been widely investigated as clean and healthy absorbing materials as an alternative to traditional fibrous and porous materials [2][3][4][5], and porous and fibrous metals are developed to be used in devices under extreme conditions [6,7] because they combine the mechanical properties of metals (lightness, stiffness, conductivity, heat withstanding, ...) and acoustical properties of porous materials.…”

Section: Introductionmentioning

confidence: 99%

“…In these ones, the acoustical properties of those materials are described by an admittance (or impedance) coefficient, which is simpler than a physical model. Different models have been developed to describe the admittance coefficients for many years [2,[8][9][10][11][12]. They may be roughly divided into three main categories [7,9]: empirical, phenomenological and micro-structural models.…”

Section: Introductionmentioning

confidence: 99%

A Model Updating Technique Based on the Constitutive Relation Error for In Situ Identification of Admittance Coefficient of Sound Absorbing Materials

Progneaux

Bouillard

Deraemaeker

2015

Journal of Vibration and Acoustics

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The development of new absorbing materials and the description of their acoustical properties take an important place in the current acoustical researches. This paper focuses on the identification of the admittance coefficient of sound absorbing material from in situ measurements, using the constitutive relation error (CRE)-based updating technique. This technique consists of a two-stage approach, allowing to regularize the inverse problem. Moreover, the technique allows the detection of faulty sensors and therefore the correction of the erroneous measurements before the updating process. The technique is developed, in a first part of this paper, for acoustical problems with generalized boundary conditions, and illustrated, in a second part, on a numerical and a physical two-dimensional (2D) test case.

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Design of a single layer micro-perforated sound absorber by finite element analysis

Cited by 21 publications

References 12 publications

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

A Model Updating Technique Based on the Constitutive Relation Error for In Situ Identification of Admittance Coefficient of Sound Absorbing Materials

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