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GB/T 34877.1-2023: Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1: General overview
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Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1: General overview
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GB/T 34877.1-2023
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Basic data | Standard ID | GB/T 34877.1-2023 (GB/T34877.1-2023) | | Description (Translated English) | Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1: General overview | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J72 | | Classification of International Standard | 23.120 | | Word Count Estimation | 38,375 | | Date of Issue | 2023-12-28 | | Date of Implementation | 2023-12-28 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 34877.1-2023: Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1: General overview
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ICS 23:120
CCSJ72
National Standards of People's Republic of China
Industrial fans for standard laboratory conditions
Determination of sound power level Part 1: General requirements
(ISO 13347-1:2004,IDT)
Published on 2023-12-28
Implemented on 2023-12-28
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
Preface V
Introduction VI
1 Scope 1
2 Normative references 1
3 Terms, definitions, symbols and units 3
4 Application scope 7
5 Measurement uncertainty 7
6 Instrumentation 9
6:1 General 9
6:2 Frequency analyzer 9
6:3 Turbulence nets and windshields 9
6:4 Standard Sound Source (RSS) 9
7 Test Method 9
7:1 General 9
7:2 Special precautions 10
8 Ventilator installation conditions 10
8:1 General 10
8:2 Reverberation chamber method 11
8:3 Envelope surface method 11
8:4 Sound intensity method 11
8:5 Pipeline Law 11
8:6 Scope 11
8:7 Small fan 11
9 Ventilator operating conditions 12
9:1 Overview12
9:2 Measurement of environmental conditions 12
9:3 Ventilator speed 12
9:4 Determination of the pneumatic operating point of the ventilator 12
9:5 Adjustment of fan operating conditions 12
10 records12
10:1 General 12
10:2 Ventilator tested 12
10:3 Acoustic environment 13
10:4 Acoustic data appropriate to the test method13
11 Calculation and evaluation14
11:1 Calculation of sound power level in 1/3 octave band 14
11:2 Calculation of total sound power level 14
11:3 Calculation of A-weighted sound power level 14
11:4 Evaluation 15
12 Test Report 15
12:1 General 15
12:2 Description of the test site, arrangement of ventilators, and location of measuring points15
12:3 Use of instruments 15
12:4 Subjective evaluation of noise characteristics15
12:5 Measured values and test results15
Appendix A (normative) Effect of speed changes16
Appendix B (informative) Changes in gas or air state 17
Appendix C (normative) Correction of end reflection 18
C:1 General 18
C:2 End reflections and pipe end corrections18
C:3 Restrictions 19
C:4 Example of determining pipe end correction adjustments19
Appendix D (informative) Simple silencer terminal 21
Appendix E (Normative) Uncertainty Analysis 22
E:1 Overview 22
E:2 Definition 22
E:3 Uncertainty 22
E:4 Room Response 22
E:5 Ventilator operating point 23
E:6 Instrument error 23
E:7 Standard Sound Source (RSS) 24
E:8 Pipe End Correction 24
E: Comparison between 9 octave band and 1/3 octave band 24
Appendix F (normative) Calibration of standard sound source 26
F:1 Overview 26
F:2 Equipment and installations26
F:3 Identification 26
F:4 Procedure 26
F:5 RSS sound power level 26
Appendix G (informative) Measurement of weighted filters 27
Reference 28
Figure C:1 End reflection correction value 20
Figure D:1 Pipe silencer (section view) 21
Figure D:2 Pipe silencer in series 21
Table 1 Sound power level 4
Table 2 Symbols and units 5
Table 3 Uncertainties in frequency band sound power level determination 7
Table 4 Maximum allowable sound pressure reflection coefficient at the anechoic end 11
Table C:1 Pipe end correction values for octave bands19
Table C:2 Octave frequency band 63Hz~8000Hz pipe end correction value 19
Table E:1 Description of discrete frequency or narrowband component characteristics expressed in terms of spatial variation of the sound field 23
Table E:2 Instrumentation system tolerances 24
Table E:3 Standard sound source correction values 24
Table E:4 Uncertainty of terminal reflection correction value E24
Table E:5 Octave band analysis 25
Table E:6 1/3 octave band analysis 25
Table F:1 Tolerances for sound power level differences26
Foreword
This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents"
Drafting:
This document is Part 1 of GB/T 34877 "Determination of sound power level of fans under standard laboratory conditions for industrial fans": GB /
T34877 has released the following parts:
---Part 1: General requirements;
---Part 2: Reverberation chamber method;
---Part 3: Envelope surface method;
---Part 4: Sound intensity method:
This document is equivalent to ISO 13347-1:2004 "Industrial Fan Standard Determination of Fan Sound Power Level under Laboratory Conditions - Part 1:
common enquiries":
This document has made the following minimal editorial changes:
---Incorporates the technical corrigendum content of ISO 13347-1:2004/Cor:1:2006, and the outer margin position of the involved clauses
Indicated with vertical double lines (‖);
---Incorporated the contents of the ISO 13347-1:2004/Adm:1:2010 amendment, the outer margins of the involved clauses are marked with vertical
Straight double lines (‖) are marked;
---Changed the list of normative reference documents in Chapter 2;
---Corrected the numbering error of the referenced documents in the introduction of Chapter 3 (corrected from ISO 3470 to ISO 3740);
---Corrected the error in the chapter number in GB/T 17697-2014 cited in Chapter 4 (corrected from 6:5 to 6:2);
---Corrected the chapter number error in ISO 13350:2015 cited in Chapter 4 (corrected from Chapter 9 to Chapter 8);
---Note added in Chapter 4;
---Corrected the chapter number error in ISO 13350:2015 cited in 7:2 (corrected from Chapter 9 to Chapter 8);
---Note added in 7:2;
---Note added in 11:3;
---Deleted "E:3 of ISO 13347-1:2004" and related issues related to testing and determining ratings in the 63Hz frequency band
(E:10)", because there is no such content in ISO 13347-1:2004, it is an editorial error;
---Deleted "Procedures according to 6:2:1" in the explanation of Lpj in E:4:3 of ISO 13347-1:2004, because ISO 13347-1:
There is no 6:2:1 in:2004 and ISO 13347-2:2004, which is an editorial error:
Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:
This document is proposed by China Machinery Industry Federation:
This document is under the jurisdiction of the National Fan Standardization Technical Committee (SAC/TC187):
This document was drafted by: Zhejiang Sanxin Technology Co:, Ltd:, Zhejiang Jindun Fan Co:, Ltd:, National Fan Product Quality Inspection and Inspection
Testing Center (Zhejiang), Suzhou Dingyu Energy Saving Equipment Co:, Ltd:, Zhejiang Shuangyang Fan Co:, Ltd:, Zhejiang Shangfeng Hi-Tech Zhuanfeng Industrial Co:, Ltd:
The main drafters of this document: Pan Xuguang, Chen Tingting, Dai Junjun, Yu Peiquan, Xu Honghai, Zhang Shuihua, Dong Mingwei, Xu Jianfeng:
Introduction
The sound power level of a ventilator is an important acoustic index to measure the performance of a ventilator: This document is used to measure the acoustic performance of industrial ventilators and can also be used to measure the acoustic performance of industrial ventilators:
It is used to determine the acoustic performance of fans with attached devices and is an important testing method for measuring the sound power of fans under standard laboratory conditions: although
Although there are many domestic standards for measuring fan noise, they lack universality and cannot be compared in the same direction: This document is adopted under the same
The measurement method under standard conditions enables my country's wind turbine companies to participate in international competition in the final acceptance of product quality:
GB/T 34877 aims to establish the important tests for the determination of the acoustic performance of industrial ventilators and the determination of sound power under standard laboratory conditions:
The method is intended to consist of four parts:
---Part 1: General requirements: The aim is to determine the acoustic performance of ventilators and when combined with auxiliary equipment:
---Part 2: Reverberation chamber method: The purpose is to establish a method for measuring the sound power level of ventilators using a reverberation chamber, which is only applicable to standard
It is used under standardized laboratory conditions: Since field testing increases uncertainty, it is not suitable for field testing:
---Part 3: Envelope surface method: The purpose is to establish a method for measuring the sound power level of ventilators using the envelope surface method, and to clarify the
Laboratory conditions necessary for a successful test, but few sites can meet these conditions, so they are not suitable for on-site measurements:
---Part 4: Sound intensity method: The purpose is to establish a method for determining the sound power level of ventilators using the sound intensity method, which is only suitable for testing in specified settings:
Airborne sound radiation was determined, vibration was not measured, and the sensitivity of airborne sound radiation to vibration effects was not determined: The ventilation of the test was implemented:
Machine size is limited only by test installation practices:
This document will help my country's ventilator industry and related fields better understand and implement the relevant technical requirements in the standards, and improve the ventilator industry
The overall acoustic technology level of the industry:
Industrial fans for standard laboratory conditions
Determination of sound power level Part 1: General requirements
1 Scope
This document specifies the determination of the acoustic performance of industrial ventilators:
This document is applicable to the determination of the acoustic performance of ventilators and their auxiliary devices as components, such as roof fan hoods,
Dampers or mufflers used in ventilators, etc: What is obtained at this time is the sound power of the ventilator and auxiliary device components:
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document:
GB/T 17697-2014 Pipe method for determination of sound power radiated into ducts by acoustic fans and other ventilation equipment (ISO 5136:
2003,IDT)
ofcertainother units)
Note: GB/T 14367-2006 Guide to the use of basic standards for the determination of sound power levels of acoustic noise sources (ISO 3740:2000, MOD)
ISO 3741 Acoustic sound pressure method for determination of sound power level and sound energy level of noise sources Reverberation chamber precision method (Acoustics-Determi-
Note: GB/T 6881:1-2002 Acoustic sound pressure method for determination of noise source sound power level Reverberation chamber precision method (idtISO 3741:1999)
ISO 3742 Determination of sound power level of acoustic noise sources Reverberation chamber precision method for discrete frequency and narrowband sound sources (Acoustics-
ISO 3743-1 Acoustic sound pressure method for determination of sound power level and sound energy level of noise sources Engineering method for small movable sound sources in reverberation fields
Note: GB/T 6881:2-2017 Acoustic sound pressure method for determination of sound power level and sound energy level of noise sources - Engineering method for small movable sound sources in reverberation fields No: 1
Part: Comparative method for hard-walled test chambers (ISO 3741-1:2010, IDT)
ISO 3743-2 Acoustic sound pressure method for determination of sound power level of noise sources in reverberant fields: Engineering method for small and medium-sized movable sound sources: Part 2:
Note: GB/T 6881:3-2002 Acoustic sound pressure method - Engineering method for determining sound power level of noise sources in reverberation fields of small and medium-sized movable sound sources - Part 2: Special purpose
Reverberation test chamber method (idtISO 3741-2:1994)
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