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

2010-01-01
Onen, Onursal
Çalışkan, Mehmet
Micro-perforated sound absorbers with sub-millimeter size holes can provide high absorption coefficients. This paper presents results of work on the development of an effective single layer micro-perforated sound absorber from the commercial composite material Parabeam (R) with micro diameter holes drilled on one side. Parabeam (R) is used as a structural material made from a fabric woven out of a E-glass yarn and consists of two decklayers bonded together by vertical piles in a sandwich structure with piles (thick fibers) woven into the decklayers. The paper includes, the analytical model developed for prediction of absorption coefficients, finite element solution using commercial software MSC.ACTRAN and experimental results obtained from impedance tube measurements. A simple optimization is performed based on the developed models to obtain an efficient absorber configuration. It has been anticipated that several different and interesting applications can be deduced by combining structural and sound absorption properties of this new micro-perforated absorber.
APPLIED ACOUSTICS

Suggestions

Development of an effective single layer micro-perforated sound absorber
Önen, Onursal; Çalışkan, Mehmet; Department of Mechanical Engineering (2008)
Micro-perforated sound absorbers with sub-millimeter size holes can provide high absorption coefficients. Various types of micro-perforated absorbers are now available in literature for different applications. This thesis presents results of work on the development of an effective single layer micro-perforated sound absorber from the commercial composite material Parabeam with micro diameter holes drilled on one side. Parabeam is used as a structural material made from a fabric woven out of a E-glass yarn a...
Theoretical investigation of effects of flow oscillations on ultrasound Doppler velocity measurements
Koseli, Volkan; Uludağ, Yusuf (Elsevier BV, 2012-02-01)
Effects of flow oscillations on spectrum of Ultrasound Doppler Velocimetry (UDV) signals were investigated theoretically and numerically. A laminar pipe flow with a superimposed oscillating component was considered. Negative impact of oscillation on the ultrasound signal hence on the flow images was observed in the form of spreading of spectral ultrasound signal energy around mean component, leading to image artifacts. Both analytical and numerical results revealed the strong effect of a group of parameters...
Acoustic radiation from a fluid-filled, subsurface vascular tube with internal turbulent flow due to a constriction
Yazıcıoğlu, Yiğit; Spohnholtz, Todd; Martin, Bryn; Loth, Francis; Bassiouny, Hisham S. (Acoustical Society of America (ASA), 2005-08-01)
The vibration of a thin-walled cylindrical, compliant viscoelastic tube with internal turbulent flow due to an axisymmetric constriction is studied theoretically and experimentally. Vibration of the tube is considered with internal fluid coupling only, and with coupling to internal-flowing fluid and external stagnant fluid or external tissue-like viscoelastic material. The theoretical analysis includes the adaptation of a model for turbulence in the internal fluid and its vibratory excitation of and interac...
Prediction of ducted diaphragm noise using a stochastic approach with adapted temporal filters
Karban, Ugur; Schram, Christophe; Sovardi, Carlo; Polifke, Wolfgang (SAGE Publications, 2019-01-01)
The noise production by ducted single- and double-diaphragm configurations is simulated using a stochastic noise generation and radiation numerical method. The importance of modeling correctly the anisotropy and temporal de-correlation is discussed, based on numerical results obtained by large eddy simulation. A new temporal filter is proposed, designed to provide the targeted spectral decay of energy in an Eulerian reference frame. An anisotropy correction is implemented using a non-linear model. The acous...
Stability and breathing motions of pressurized compressible hyperelastic spherical shells
Akyüz, Uğurhan (Elsevier BV, 2001-10-18)
The stability of homogeneous, isotropic, compressible, hyperelastic, thick spherical shells subjected to external dead-load traction are investigated within the context of the finite elasticity theory. The stability of the finitely deformed state and small, free, radial vibrations about this state are investigated using the theory of small deformations superposed on large elastic deformations. The frequencies of small free vibrations about the pre-stressed state are obtained numerically. The loss of stabili...
Citation Formats
O. Onen and M. Çalışkan, “Design of a single layer micro-perforated sound absorber by finite element analysis,” APPLIED ACOUSTICS, pp. 79–85, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41786.