GB/Z 27764-2011 (English Version) PDF

Standard No.: GB/Z 27764-2011
Language: Chinese, Available in English version
Release Date: 2011
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/Z 27764-2011

Scope: This guiding technical document stipulates the measurement of normal incidence sound insulation (or normal incidence sound transmission loss) of acoustic materials or acoustic structures in impedance tubes by using the transfer matrix method. This guiding technical document is applicable to the measurement of the normal incidence sound insulation of locally reactive acoustic materials such as sponges, cotton felts, and soft thin plates whose test frequency is in the quality control area (that is, there is no sound propagation parallel to the material inside the material); applicable to Comparison of sound insulation performance of acoustic materials in the development stage; since the sound transmission loss of a material is closely related to its physical properties (such as elastic modulus, density, structure factor, etc.), the measurement methods specified in this guidance technical document can be applied to relevant basic research and product development. This guiding technical document is not applicable to the identification test of the sound insulation performance of the product. This guidance technical document uses an impedance tube, one or more microphones and a digital acquisition and analysis system.

GB/Z 27764-2011 Referenced Document

GB/T 18696.2-2002 Acoustics--Determination of sound absorption coefficient and impedance in impedance tubes Part 2: Transfer function method
GB/T 3947-1996 Acoustical terminology

2011 GB/Z 27764-2011 Acoustics. Determination of sound transmission loss in impedance tubes. Transfer matrix method