Evaluation of Acoustic Characteristics for Various Composite Ventilation Material by Using Impedance Tube

Yu Cheng Liu; Jin Huang Huang; Chen Hung Huang; Hong Ching Her; Yu Chun Chuang

doi:10.4028/www.scientific.net/AMR.910.78

Paper Titles

An Orthogonal Experimental Analysis of WEDM-HS of Al₂O₃ Particle-Reinforced Aluminum Alloy 6061 with 10-Vol% Al₂O₃
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Research on Biological Materials for the Preferred of the Chlorophyll Content Gray GM (1,1) Prediction Models Based on the Different Light
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Toughening of Epoxy Resin Modified with In Situ Polymerized Acrylate Copolymer
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Study on Elastic Modulus of Porous Ti Coatings by Three-Point Bending and Indentation Measurement
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Evaluation of Acoustic Characteristics for Various Composite Ventilation Material by Using Impedance Tube
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Effect of Vermiculite and Bulk Density in the PU Foam Composite Board for the Absorption Coefficient and Acoustic Impedance
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Low-Phosphorus Electroless Nickel-Coated Carbon Fibers
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Experimental and Theoretical Investigation of Flexure Behavior and Failure Mode of Filament-Wound Composite Tube
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Experimental Research on Rheological Properties of Slick Water Mixed with CO₂ System
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 910Evaluation of Acoustic Characteristics for Various...

Evaluation of Acoustic Characteristics for Various Composite Ventilation Material by Using Impedance Tube

Abstract:

With the development of techniques, the acoustic performance of 3C electroacoustic products, such as earphone, headphone, microspeaker and etc., will be paid much attention. Ventilation material which is often used in the front and rear side of the product is also an important component to affect the acoustic performance. Depending on the diverse manufacture processes and materials, there are many kinds of ventilation materials, including paper, mesh, poron, nonwoven and etc.. This study aims to investigate acoustic characteristics of these ventilation materials, including air permeability, reflection coefficient, and acoustic impedance. The result indicates that mesh with different code number shows similar air permeability. Meanwhile, the reflection coefficients of each mesh material have no significant variation with the frequency. For the lower frequencies, the level of acoustic impedance is much related to the structure or material used. With the increment of frequency, the acoustic impedance of all the materials will converge to a certain value even for the higher density material.