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GB/T 2888-2008Methods of noise measurement for fans blowers compressors and roots blowers (English PDF)

风机和罗茨鼓风机噪声测量方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 9, 2008

Implementation date

February 1, 2009

Scope

GB/T 2888-2008 is the English-translated version of 风机和罗茨鼓风机噪声测量方法.

GB/T 2888-2008 is the Chinese standard "Methods of noise measurement for fans blowers compressors and roots blowers". Its scope clause reads: This Standard specifies the noise measuring methods of the A-sound-level and sound pressure level, and it also specifies the noise measuring methods of the sound power level.

This Standard applies to noise measurement for fans, turbo-blowers, turbo-compressors (hereinafter referred to as fans) and Roots blowers.

Its clauses include terms, symbols and units; measurement items; measurement condition; measuring instruments, equipment, rack and its requirements; measuring device; measuring procedure; measuring method; processing of measurement data; measurement reports.

It was issued by the State Administration for Quality Supervision, Inspection and Quarantine on JULY 9, 2008 and took effect on FEBRUARY 1, 2009.

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Document preview — GB/T 2888-2008

National Standard of the People's Republic of China

ICS: 23.120
Classification: J 72
Replacing: GB/T 2888-1991

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope5
2 Normative references5
3 Terms, symbols and units5
4 Measurement items8
5 Measurement condition8
6 Measuring instruments, equipment, rack and its requirements9
7 Measuring device9
8 Measuring procedure10
9 Measuring method10
10 Processing of measurement data20
11 Measurement reports22
Annex A24
Annex B33

Foreword

This Standard is the revision to GB/T 2888-1991 Methods of noise measurement for fans blowers compressors and Roots blowers.

Compared with GB/T 2888-1991, the changes of the main technical contents of this Standard are as follows.

- Revise the title "Main Content and Scope of Application" to "Scope".

- Reconfirm the validity of the reference standards, and add corresponding standards.

- Revise the title "Code" to "Unit" in Chapter 3.

- Increase the fans sound source of free inlet and free outlet in 3.2, and combine the notes of icons and figures.

- The statement "When carrying out outlet aerodynamic performance test of fans" specified in 9.2.1.1 is revised as "When carrying out performance test of free inlet and pipeline outlet of fans", and icons for description are added.

- The statement "When carrying out inlet aerodynamic performance test of fans" specified in 9.2.1.2 is revised as "When carrying out performance test of pipeline inlet and free outlet of fans", and icons for description are added.

- The statement "When carrying out inlet and outlet aerodynamic performance test of fans" specified in 9.2.1.3 is revised as "When carrying out performance test of pipeline inlet and pipeline outlet of fans", and icons for description are added. The statement "Measure the air outlet radiation noise from the vent duct. The measuring position D is at the 45° direction from the air outlet axis. The distance from the outlet center is the standard length. The measurement position shall be selected at the area without airflow vortex".

- Add icons' noted in 9.2.1.4, 9.2.1.5 and 9.2.2.

- In 10.2.1, when the test speed n is different from rated speed n0, the sound pressure level conversion formula is modified.

- In 10.2.2, when the atmospheric pressure and the temperature are significantly different with that in the standard state, the sound pressure level conversion formula is modified.

- Add A-sound-level calculation formula of fans noise in 10.2.3.

- Units and icons' notes of some parameters in the previous standard are modified. Annex A and Annex B of this Standard are informative.

1 Scope

This Standard specifies the noise measuring methods of the A-sound-level and sound pressure level. And it also specifies the noise measuring methods of the sound power level.

This Standard applies to noise measurement for fans, turbo-blowers, turbo-compressors (hereinafter referred to as fans) and Roots blowers.

2 Normative references

The articles contained in the following documents have become part of this Standard when they are quoted herein. For the dated documents so quoted, all the modifications (excluding corrections) or revisions made thereafter shall not be applicable to this Standard.

For the undated documents so quoted, the latest editions shall be applicable to this Standard.

GB/T 1236 Industrial fans-Performance testing using standardized airways

GB/T 3947 Acoustical terminology

GB/T 10178 Industrial fans-performance testing in situ (GB/T 10178-2006, ISO 5802. 1997, IDT)

JB/T 3165 Thermodynamic performance test for centrifugal & axial blowers and compressor

3 Terms, symbols and units

3.1 A-sound-level With A-sound-level meter or other measuring instrument that is equivalent, the noise level

Decibel, with unit symbol of dB. In order to make it clear, this Standard uses dB(A) to express A-characteristic weighting.

3.2 Sound source

The sound sources generated by enclosure, inlet, outlet and other sources of the fans and Roots blowers. The specific positions of the sound sources (indicated by X) are shown in Figure 1-7.

3.3 Standard sound source

Standard sound source is the sound source that has very stable output and good omni-direction within the range of the measurement frequency, and it is calibrated in anechoic chamber or reverberation chamber.

4 Measurement items

Under the operating conditions specified, measure A-sound-level and the frequency-band sound pressure level of fans and Roots blowers.

5 Measurement condition

5.1 Measurement environment

5.2 Operating conditions

In general, noise shall be measured under the condition of rated speed and rated flow. It can also be measured under other conditions as agreed by the user. However, the specific operating conditions shall be recorded clearly.

6 Measuring instruments, equipment, rack and its requirements

Measuring instruments are sound level meter and octave frequency-band filters or the equivalent instruments. Sound level meter and octave frequency-band filters shall comply with the relevant standards.

7 Measuring device

The measuring devices of fans and Roots blowers shall comply with the performance testing method of corresponding standards. When installing, it shall meet the following requirements. […]

8 Measuring procedure

Generally, aerodynamic performance test is simultaneously conducted with noise measurement of fans and Roots blowers. Noise measurement for each operating point shall be simultaneously measured with the corresponding measured values of aerodynamic performance. When it is tested on site, it can be measured in operating condition.

9 Measuring method

9.1 Measuring steps

9.1.1 The weighting network of sound level meter shall use Gear A.

9.2 Location of measuring point

9.2.1 Location of measuring point of the fans

9.2.1.1 When carrying out performance test of free inlet and pipeline outlet of fans, measure the air inlet radiation noise. The measuring point S is located on the air inlet axis, with a distance of a standard length away from the air inlet center. It is shown in Figure 8 - Figure 14.

9.2.2

Measuring point location of enclosure sound of Roots blowers, turbo- blowers and compressors

9.3 Height of measuring point

If the height of measuring points of above fans and Roots blowers is less than 1m from ground, measure at the height of 1m. The absolute distance between the measuring points and the sound sources is equal to the standard length.

10 Processing of measurement data

10.1 Recording method

The measuring devices and positions shall be recorded in the measuring results. And the noise shall be known clearly that whether it is generated from the openings of the inlet and outlet of the fans or from the enclosure. For enclosure noise of the fans and the Roots blowers, the average noise level shall be calculated according to the measuring point locations C1, C2..., based on Formula (1).

10.2 Conversion formula

10.2.1 When measuring the noise from the fans inlet and outlet (see 9.2.1.1-9.2.1.3) and when the test speed n and the rated speed n0 are different, the sound pressure level Lpn0 is converted according to formula (2).

10.2.2 Under normal circumstances, the effects of temperature and atmospheric pressure on sound pressure level Lp shall not be considered. However, when the atmospheric pressure and temperature are significantly different with that in standard state, the sound pressure level Lp0 is converted according to formula (3).

10.2.3 Ratio A-sound-level calculation formula of fans noise.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 33 pages — is available in the English PDF.

Referenced standards

Normative references

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Editions of GB/T 2888

Edition	Title	Revision	Status
GB/T 2888-2008	Methods of noise measurement for fans blowers compressors and roots blowers	current edition	Current
GB/T 2888-1991	Methods of noise measurement for fans blowers compressors and roots blowers	previous edition	Superseded

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