Applicability of locally reacting boundary conditions to porous material layer backed by rigid wall: Wave-based numerical study in non-diffuse sound field with unevenly distributed sound absorbing surfaces

Yasuda, Yosuke; Ueno, Satoki; Kadota, Masaru; Sekine, Hidehisa

doi:10.1016/j.apacoust.2016.06.006

Cited by 13 publications

(11 citation statements)

References 20 publications

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“…In non-diffuse sound fields, the incident angle dependence of surface impedance has considerable influence on the resulting sound field, as presented by Yasuda et al [12]. Using a non-diffused sound field with unevenly distributed absorbers, they showed the difference between extended and local reactions for a porous material layer with a rigid wall [12]. In addition, the example can confirm the inappropriateness of using diffuse field theory such as Sabine and Eyring formulas.…”

Section: Comparison Of the Presented Fe Solver With Surface Impedancementioning

confidence: 93%

“…This sound field is an appropriate example because the resulting sound field becomes a non-diffuse sound field, as explained later. In non-diffuse sound fields, the incident angle dependence of surface impedance has considerable influence on the resulting sound field, as presented by Yasuda et al [12]. Using a non-diffused sound field with unevenly distributed absorbers, they showed the difference between extended and local reactions for a porous material layer with a rigid wall [12].…”

Section: Comparison Of the Presented Fe Solver With Surface Impedancementioning

confidence: 97%

“…Such a model can be constructed by dealing with sound propagation inside absorbers. Although wave-based predictions of sound fields in practical sized rooms with the appropriate absorber model have been regarded as difficult because of their high computational cost, recent advances in computer technology present the possibility of such prediction [11,12].…”

Section: Introductionmentioning

confidence: 99%

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A frequency domain finite element solver for acoustic simulations of 3D rooms with microperforated panel absorbers

Okuzono

Sakagami

2018

Applied Acoustics

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Section: Comparison Of the Presented Fe Solver With Surface Impedancementioning

confidence: 93%

Section: Comparison Of the Presented Fe Solver With Surface Impedancementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A frequency domain finite element solver for acoustic simulations of 3D rooms with microperforated panel absorbers

Okuzono

Sakagami

2018

Applied Acoustics

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“…Although they entail a huge computational effort for acoustic simulations especially at kilohertz frequencies in a real-sized room, their application to room acoustics prediction is increasing gradually by virtue of the progress of computer technology and the continuous development of efficient methods [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In addition, some recent studies [16,18,22,25] use extended-reaction boundary conditions to address both the frequency dependent and incident-angle dependent absorption characteristics of sound absorbers accurately, whereas many studies use the simplest local-reaction boundary conditions, which simplify the incident-angle dependence of surface impedance. Nevertheless, wave-based predictions are still time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Potential of Room Acoustic Solver with Plane-Wave Enriched Finite Element Method

2020

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Predicting room acoustics using wave-based numerical methods has attracted great attention in recent years. Nevertheless, wave-based predictions are generally computationally expensive for room acoustics simulations because of the large dimensions of architectural spaces, the wide audible frequency ranges, the complex boundary conditions, and inherent error properties of numerical methods. Therefore, development of an efficient wave-based room acoustic solver with smaller computational resources is extremely important for practical applications. This paper describes a preliminary study aimed at that development. We discuss the potential of the Partition of Unity Finite Element Method (PUFEM) as a room acoustic solver through the examination with 2D real-scale room acoustic problems. Low-order finite elements enriched by plane waves propagating in various directions are used herein. We examine the PUFEM performance against a standard FEM via two-room acoustic problems in a single room and a coupled room, respectively, including frequency-dependent complex impedance boundaries of Helmholtz resonator type sound absorbers and porous sound absorbers. Results demonstrated that the PUFEM can predict wideband frequency responses accurately under a single coarse mesh with much fewer degrees of freedom than the standard FEM. The reduction reaches O ( 10 − 2 ) at least, suggesting great potential of PUFEM for use as an efficient room acoustic solver.

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“…Moreover, the significance of introducing extended reaction boundaries into computer models has been demonstrated -using phased beam tracing, the influence on the steady state sound pressure level in frequency bands was shown by Hodgson and Wareing [27] and on several acoustic parameters (strength, reverberation time and rapid speech transmission index) by Yousefzadeh and Hodgson [28]. Recently, Yasuda et al [29] showed by wave-based modeling that the extended reaction alters the response in particular at low frequencies, which is also the frequency range of our interest.…”

Section: Introductionmentioning

confidence: 99%

Ray-tracing semiclassical (RTS) low frequency acoustic modeling validated for local and extended reaction boundaries

Prislan¹,

Svenšek²

2018

Journal of Sound and Vibration

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The recently introduced acoustic ray-tracing semiclassical (RTS) method is validated for a set of practically relevant boundary conditions. RTS is a frequency domain geometrical method which directly reproduces the acoustic Green's function. As previously demonstrated for a rectangular room and weakly absorbing boundaries with a real and frequency-independent impedance, RTS is capable of modeling also the lowest modes of such a room, which makes it a useful method for low frequency sound field modeling in enclosures. In practice, rooms are furnished with diverse types of materials and acoustic elements, resulting in a frequency-dependent, phase-modifying absorption/reflection. In a realistic setting, we test the RTS method with two additional boundary conditions: a local reaction boundary simulating a resonating membrane absorber and an extended reaction boundary representing a porous layer backed by a rigid boundary described within the Delany-Bazley-Miki model, as well as a combination thereof. The RTS-modeled spatially dependent pressure response and octave band decay curves with the corresponding reverberation times are compared to those obtained by the finite element method.

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Applicability of locally reacting boundary conditions to porous material layer backed by rigid wall: Wave-based numerical study in non-diffuse sound field with unevenly distributed sound absorbing surfaces

Cited by 13 publications

References 20 publications

A frequency domain finite element solver for acoustic simulations of 3D rooms with microperforated panel absorbers

A frequency domain finite element solver for acoustic simulations of 3D rooms with microperforated panel absorbers

Potential of Room Acoustic Solver with Plane-Wave Enriched Finite Element Method

Ray-tracing semiclassical (RTS) low frequency acoustic modeling validated for local and extended reaction boundaries

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