【Use Case】 Material Testing

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last updated：May 07, 2018

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Acoustic material testing is conducted to measure the acoustic properties of materials.

As noise control issues and sound quality have become important aspects of product design, acoustic material testing has become increasingly relevant for engineers, designers, and manufacturers across various industries. Acoustic material testing is conducted to measure the acoustic properties of materials (such as absorption coefficient, reflection coefficient, impedance, and admittance). There are various methods for measuring the acoustic properties of materials. It is necessary to place the material in a known sound field and measure the impact of the material on that sound field. There are a series of standards (such as JIS A1405-2 (ISO 10534-2), ASTM E1050-08, ASTM E2611-09, etc.) that clearly define special equipment to ensure acoustic conditions, accuracy, and reproducibility for material testing. For more details, please contact us.

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【Acoustic Material Characteristics】 ○ Absorption Rate (a), 0 < a < 1, the ratio of acoustic energy absorbed at the material surface ○ Complex Reflection Coefficient (r), 0 < r < 1, the reflected component of sound pressure from the material surface (p_reflection) / the incident component of sound pressure to the material surface (p_incoming) ○ Complex Acoustic Impedance (Z), Z = R + jX [Pa x s/m³], sound pressure (p) / particle velocity (u) at the material surface ○ Complex Acoustic Admittance (G), G = g – jb [m³/(Pa x s)], particle velocity (u) / sound pressure (p) at the material surface ○ Transmission Loss (TL) [dB ref. 1], incident acoustic power to the material surface (W_incidence) / transmitted acoustic radiation power from the back of the material (W_transmitted) 【Material Testing Standards】 ○ Loss Coefficient (η), when the elastic term is represented as k(1+jη) including spring constant and viscous resistance, the loss Young's modulus (longitudinal elastic modulus) (E), stress (σ) / strain (ε) ● For more details, please contact us.