Journal ArticleDOI
Acoustic performance of countersunk micro-perforated panel in multilayer porous material:
L. Yuvaraj,S. Jeyanthi +1 more
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In this article, the acoustic performance of a countersunk micro-perforated panel, along with two distinct porous materials used in a multilayer porous absorber configuration, was investigated.Abstract:
This study investigates the acoustic performance of a countersunk micro-perforated panel, along with two distinct porous materials used in a multilayer porous absorber configuration. Additive manuf...read more
Citations
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Theory of microslit absorbers
TL;DR: In this paper, the exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are derived and a simple and practical formula is derived for the single slit.
Journal ArticleDOI
Broadband high-efficiency meta-structures design by acoustic critical absorption effect
TL;DR: In this paper , a 50 mm thick meta-structure is proposed, which obtains an average sound absorption performance of 70 % from 1000 Hz to 2800 Hz, compared with a structure of the same size but without considering the acoustic critical absorption effect.
Journal ArticleDOI
A comparative study of smart polyurethane foam using RSM and COMSOL multiphysics for acoustical applications: from materials to component
V. Selvaraj,Jeyanthi Subramanian +1 more
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An acoustic structure design supported by shear thickening fluid for sound absorption
Ramazan Aslan,Osman Turan +1 more
TL;DR: In this article, an acoustic structure consisting of cellular and perforated panel absorbers has been designed to noise control, and the sound absorption behavior of designed acoustic structure has been investigated experimentally by reinforcing with STFs having different rheological properties.
Journal ArticleDOI
Parameter Optimization of Impedance Gradient Change Medium Based on Reinforcement Learning
TL;DR: The experimental results show that the optimization method of the parameters of the impedance gradient change medium based on reinforcement learning was superior to the traditional method and are effective to reduce the acoustic reflection to a lower level.
References
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Journal ArticleDOI
On the Theory and Design of Acoustic Resonators
TL;DR: In this paper, the effect of different aperture geometries on the resonance frequency of resonators is considered and illustrated by examples, considering losses due to viscosity, heat conduction, and radiation, the optimum design for maximum resonance absorption is analyzed, and the results are expressed in terms of design charts.
Journal ArticleDOI
New empirical equations for sound propagation in rigid frame fibrous materials
Jean‐F. Allard,Yvan Champoux +1 more
TL;DR: In this paper, new expressions are given that can be used instead of the phenomenological equations of Delany and Bazley, and they provide similar predictions in the range of validity of these equations, and in addition are valid at low frequencies where the equations provided unphysical predictions.
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The acoustic impendance of perforates at medium and high sound pressure levels
TL;DR: In this article, a study of the behavior of the acoustic impedance of a range of perforates at medium and high incident sound pressure levels was carried out, which included a detailed experimental programme together with a theoretical analysis of the problem.
Journal ArticleDOI
Acoustic Circulation Effects and the Nonlinear Impedance of Orifices
U. Ingård,S. Labate +1 more
TL;DR: In this paper, the authors used smoke particles in a 3.5-in. diameter circular tube to study acoustical streaming phenomena around orifices, showing that there exist four definite regions of flow as the particle velocity in the orif.