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

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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, 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). It is applicable
to the 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 guiding 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 guiding technical document uses an impedance tube, one or more microphones,
and a digital acquisition and analysis system.

Basic Data

Standard ID	GB/Z 27764-2011 (GB/Z27764-2011)
Description (Translated English)	Acoustics - Determination of sound transmission loss in impedance tubes - Transfer matrix method
Sector / Industry	National Standard
Classification of Chinese Standard	A59
Classification of International Standard	17.140.01
Word Count Estimation	29,271
Date of Issue	2011-12-30
Date of Implementation	2012-05-01
Quoted Standard	GB/T 3947-1996; GB/T 18696.2-2002
Regulation (derived from)	?National Standard Approval Announcement 2011 No.22
Issuing agency(ies)	Ministry of Health of the People's Republic of China
Summary	This standard specifies the transfer matrix method used to measure the acoustic structure of acoustical materials or methods in acoustic impedance tube to the amount of incident (or normal incidence sound transmission loss). Measuring and testing frequency in cotton blankets soft sheets and other quality control areas local reactions acoustic material (ie, parallel to its surface inside the material does not sound propagation) of normal incidence acoustic volume, , This guidance document applies to the sponge technique applies acoustic insulation material development phase contrast performance, sound transmission loss of material due to its physical characteristics (such as modulus of elasticity, structure factor, density) are closely related, so the measuring method of the present document provides guidance technology can be applied to the relevant basic research and product development. The technical guidance document does not apply to product qualification testing insulation properties. The technical guidance document using the impedance tube, one or more microphones and digital acquisition and analysis system.