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GB/T 21231.2-2018Acoustics -- Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices -- Part 2: Structure-borne vibration measurements (English PDF)

声学小型通风装置辐射的空气噪声和引起的结构振动的测量第2部分：结构振动测量

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

March 15, 2018

Implementation date

October 1, 2018

Scope

GB/T 21231.2-2018 is the English-translated version of 声学小型通风装置辐射的空气噪声和引起的结构振动的测量第2部分：结构振动测量.

GB/T 21231.2-2018 is the Chinese standard "Acoustics -- Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices -- Part 2: Structure-borne vibration measurements".

Its scope clause reads: This part of GB/T 21231 applies to the vibration level measurement of small ventilation devices, according to the provisions of GB/T 21231.1-2018, The installation area of the full-size test box for this type of small ventilation device is less than 0.48m×0.90m, and the installation area of the scaled-1/2 test box is less than 0.18m×0.3m.

This section applies to each test box that can be installed in compliance with the provisions of GB/T 21231.1-2018, with self-supporting and inlet and outlet faces.

Small ventilation devices. The procedures specified in this section specify the measurement of vibration levels caused by the common structure of small ventilation units used in information and communication equipment.

Quantity method. The method specified in this part can be used to determine the vibration level of a single small ventilation unit. If the vibration level is given by a series of These data are used to determine the vibration level statistics of the series of small ventilation units. Its clauses include terms and definitions.

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Document preview — GB/T 21231.2-2018

National Standard of the People's Republic of China

ICS: 17.140
Classification: A 59

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Description
5 Measurement uncertainty
6 Test fixture design and performance requirements
7 Installation
8 Ventilation operation
9 Instrument
10 Measurement Step
11 Test Report
Appendix A (informative annex) Recommended report data format
Appendix B (informative annex) Recommended voltage for testing variable speed operating ventilation units
Appendix C (Informative) Technical Specification for Vibration Levels of Ventilation Devices, Acceleration Level
Appendix D (Informative) Guidance for the Evaluation of Uncertainty in Measurement

1 Scope

This part of GB/T 21231 applies to the vibration level measurement of small ventilation devices, according to the provisions of GB/T 21231.1-2018,

The installation area of the full-size test box for this type of small ventilation device is less than 0.48m×0.90m, and the installation area of the scaled-1/2 test box is less than

0.18m×0.3m.

This section applies to each test box that can be installed in compliance with the provisions of GB/T 21231.1-2018, with self-supporting and inlet and outlet faces.

Small ventilation devices.

The procedures specified in this section specify the measurement of vibration levels caused by the common structure of small ventilation units used in information and communication equipment.

Quantity method. The method specified in this part can be used to determine the vibration level of a single small ventilation unit. If the vibration level is given by a series of

These data are used to determine the vibration level statistics of the series of small ventilation units.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article

Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 21231.1-2018 Acoustics Measurement of airborne noise and induced structural vibration of small ventilation installations Part 1

Points. Air Noise Measurement (ISO 10302-1.2011, IDT)

ISO 266 Acoustics-Preferredfrequencies

ISO 5348 Mechanical Vibration and Impact Accelerometer Mechanical Installation (Mechanicalvibrationandshock-Mechanical

Mountingofaccelerometers)

ISO 16063-11 Vibration and Shock Sensor Calibration Methods Part 11. Laser Interferometry Absolute Calibration (Methods for thecalibrationofvibrationandshocktransducers-Part 11.Primaryvibrationcalibrationbylaserin-

Terferometry)

ISO 16063-21 Calibration methods for vibration and shock sensors - Part 21. Vibration calibration for comparison with reference sensors (Methodsforcalibrationofvibrationandshocktransducers-Part 21.Vibrationcalibrationbycom-

Parisontoareferencetransducer)

IEC 61260 Electroacoustic octave band and fractional octave band filters (Electroacoustics-Octave-bandandfractional-

Octave-bandfilters)

ISO /IEC Guide 98-3 Measurement uncertainty - Part 3. Guidance for the expression of measurement uncertainty (GUM..1995) (Uncer- taintyinmeasurement-Part 3.Guidetotheexpressionofuncertaintyinmeasurement(GUM.1995))

3 Terms and definitions

The terms and definitions defined in GB/T 21231.1-2018 and the following apply to this document.

GB/T 20247 | GB/T 19889.1 | GB/T 19890 | GB/T 15173 | GB/T 21231.1 | GB/T 21230 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 44 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 21231.1-2018Acoustics -- Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices -- Part 1: Airborne noise measurement

ISO 10302 · ISO 266 · ISO 5348 · ISO 16063 · IEC 61260

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