GB/T 6882-2016 PDF English
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| GB/T 6882-2016 | English | 625 |
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Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Precision methods for anechoic rooms and hemi-anechoic rooms
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| GB/T 6882-2008 | English | RFQ |
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Acoustics -- Determination of sound power levels of noise sources using pressure -- Precision methods for anechoic and hemi-anechoic rooms
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| GB/T 6882-1986 | English | 879 |
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Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms
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GB/T 6882-2016: Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Precision methods for anechoic rooms and hemi-anechoic rooms
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT6882-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.040
A 59
GB/T 6882-2016 / ISO 3745.2012
Replacing GB/T 6882-2008
Acoustics - Determination of sound power levels and
sound energy levels of noise sources using sound
pressure - Precision methods for anechoic rooms and
hemi-anechoic rooms
(ISO 3745.2012, IDT)
Issued on. FEBRUARY 24, 2016
Implemented on. SEPTEMBER 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 7
2 Normative references... 8
3 Terms and definitions... 8
4 Reference meteorological conditions... 16
6 Instrumentation... 20
7 Definition, location, installation and operation of noise source under test... 21
8 Measurement surface... 24
9 Determination of sound power levels and sound energy levels... 26
10 Measurement uncertainty... 39
11 Information to be recorded... 44
12 Test report... 46
Annex A (normative) General procedures for qualification of anechoic and hemi-
anechoic room... 47
Annex B (normative) Qualification procedure for spaces within test rooms used
in the determination of sound power levels and sound energy levels of specific
noise sources... 57
Annex C (normative) Calculation of A-weighted sound power levels and A-
weighted sound energy levels from one-third-octave band levels... 60
Annex D (normative) Array of microphone positions on a spherical
measurement surface in a free field... 62
Annex E (normative) Arrays of microphone positions on a hemispherical
measurement surface in a hemi-free field... 64
Annex F (normative) Coaxial circular paths of microphones on a hemispherical
measurement surface in a hemi-free field... 69
Annex G (normative) Meridional paths of microphones on a hemispherical
measurement surface in a hemi-free field... 70
Annex H (normative) M Spiral paths of microphones on a hemispherical
measurement surface in a hemi-free field... 73
Annex I (informative) Guidance on the development of information on
measurement uncertainty... 74
Annex NA (informative) Test room design guidelines... 88
Bibliography... 90
Foreword
This Standard is one of the series of standards of determination of sound power
levels and sound energy levels of noise sources using sound pressure.
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 6882-2008 "Acoustics - Determination of sound
power levels of noise sources using pressure - Precision methods for anechoic
and hemi-anechoic rooms".
Compared with GB/T 6882-2008, the main modifications in this Standard are
as follows.
- added the content of terms and definitions;
- the content of measurement uncertainty has been greatly revised; added
the content of cyclic comparison test and mathematical model method to
determine the standard deviation of reproducibility;
- improved the "background noise requirement" to the "background noise
criterion"; respectively formulated the relative value criterion and the
absolute value criterion; supplemented the remarks of 5.2.2 absolute
value criterion, so as to make the remarks more detailed and clearer;
- modified the definition and expression of directivity index;
- added the baseline weather conditions;
- increased microphone array positions from 20 to 40;
- kept the Annex K (informative) "Guidelines for design of test room" in GB/T
6882-2008 as Annex NA of this Standard; this annex was deleted from
ISO 3745.2003 when ISO 3745.2012 was revised; taking into account the
needs of China's acoustic measurement and precision testing room
construction, this Standard retains this annex.
This Standard uses translation method to identically adopt ISO 3745.2012
"Acoustics - Determination of sound power levels and sound energy levels of
noise sources using sound pressure - Precision methods for anechoic rooms
and hemi-anechoic rooms" (English version).
The Chinese documents which have consistency with the international
normative reference in this Standard are as follows.
- GB/T 3241-2010, "Electroacoustics - Octave-band and fractional-octave-
band filters" (IEC 61260.1995+AM1.2001, MOD)
- GB/T 6379 "Accuracy (trueness and precision) of measurement methods
and results" (all parts), [ISO 5725 (all parts)]
- GB/T 17247.1-2000, "Acoustics - Attenuation of sound during propagation
outdoors - Part 1.Calculation of the absorption of sound by the
atmosphere" (eqv ISO 9613-1.1993)
- GB/T 17312-1998, "Random-incidence and diffuse-field calibration of
sound level meters" (eqv IEC 61183.1994)
This Standard was proposed by Chinese Academy of Sciences.
This Standard shall be under the jurisdiction of National Technical Committee
on Acoustics of Standardization Administration of China (SAC/TC 17).
The drafting organizations of this Standard. Institute of Acoustics, Chinese
Academy of Sciences, Shenzhen Zhongya Mechanical and Electrical Industry
Co., Ltd., Tongji University, Nanjing University, Beijing Labor Protection
Research Institute, Hefei University of Technology, Shanghai Institute of
Environmental Sciences, Anhui Vocational and Technical College, China
Institute of Metrology, Changsha Aobang Environmental Protection Industry Co.,
Ltd.
Main drafters of this Standard. Lyu Yadong, Fang Qingchuan, Cheng Mingkun,
Tian Jing, Yu Wuzhou, Mao Dongxing, Qiu Xiaojun, Zhang Bin, Li Xiaokuan, Li
Zhiyuan, Zhou Yude, Bao Junyao, Xu Xin, Yin Jiao, He Longbiao, Mo Jianyan.
Versions of standard substituted by this Standard are.
- GB 6882-1986, GB/T 6882-2008.
1 Scope
The test rooms that are applicable for measurements made in accordance with
this Standard are an anechoic room or hemi-anechoic room, also called,
respectively, a free-field test room or hemi-free-field test room.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
sound field in a homogeneous, isotropic medium free of boundaries
4 Reference meteorological conditions
Reference meteorological conditions for the purpose of calculating the sound
power level and sound energy level, corresponding to a reference characteristic
acoustic impedance of air ρc = 411.5 N•s/m3 (where ρ is the density of air and
5 Test rooms
If the above background noise criteria are not satisfied, the report shall clearly
state that the background noise requirements of this Standard have not been
met, and, in the case of frequency band measurements, shall identify the
particular frequency bands that do not meet the criteria. Furthermore, the report
shall not state or imply that the measurements have been made “in full
conformity” with GB/T 6882.
6 Instrumentation
The maximum permissible error for instruments used for meteorological
measurements shall be
For instruments used for monitoring meteorological conditions, e.g. to ensure
that any of these parameters is within a specified interval, manufacturer’s
specifications are deemed sufficient to verify these requirements.
7 Definition, location, installation and operation of noise source under test
Care shall be taken to ensure that any electrical conduits, piping or air ducts
connected to the noise source under test do not radiate significant amounts of
sound energy into the test environment.
8 Measurement surface
The measurement surface shall be wholly contained within the region of the
hemi-anechoic room which is qualified for measurements in accordance with
Annex A or Annex B.
9 Determination of sound power levels and sound energy levels
The meteorological conditions (air temperature, static pressure and relative
humidity) around the noise source at the time of the test shall be measured.
The background noise correction, K1i, at the ith microphone position or for the ith
microphone traverse in each one-third-octave band shall be calculated using
Equation (11), in decibels (dB).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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