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GB/T 34877.4-2024 English PDF

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GB/T 34877.4-2024: Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 4: Sound intensity method
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Basic data

Standard ID GB/T 34877.4-2024 (GB/T34877.4-2024)
Description (Translated English) Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 4: Sound intensity method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J72
Classification of International Standard 23.120
Word Count Estimation 30,394
Date of Issue 2024-05-28
Date of Implementation 2024-12-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 34877.4-2024: Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 4: Sound intensity method


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23:120 CCSJ72 National Standards of People's Republic of China Industrial fans Fans under standard laboratory conditions Determination of sound power level - Part 4: Sound intensity method (ISO 13347-4:2004, IDT) Released on 2024-05-28 2024-12-01 implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Instruments and test methods 2 4:1 General 2 4:2 Standard Sound Source (RSS) 2 4:3 Transducer and instrument system calibration check 2 4:4 Performance Verification 3 4:5 Test Method 3 5 Equipment and test equipment 4 5:1 Test Environment 4 5:2 Fan Installation 4 5:3 Measuring Surface 8 5:4 Standard Sound Source (RSS) 8 6 Test Methods 9 6:1 General 9 6:2 Sampling of Measuring Surface Noise 10 6:3 Number of measurements 10 6:4 Observation 11 7 Calculation 13 7:1 Surface average grade 13 7:2 Background noise criteria 14 7:3 Convergence index (δWn) 14 7:4 Standard sound source adjustment (RW) 14 7:5 Sound power level (LW) 14 8 Report and Results 15 8:1 Uncertainty of results 15 8:2 Presentation of results 15 8:3 Results 15 8:4 Reporting the most basic information 15 Appendix A (Normative) Indicators for use in difficult situations 17 Appendix B (Normative) Alternative test procedures for large ventilator equipment 18 B:1 Overview 18 B:2 Procedure 18 B:3 Results 18 Appendix C (Normative) Noise radiation from fan casing 19 C:1 Overview 19 C:2 Device 19 C:3 Measurement 20 Reference 21 Figure 1 Fan total noise test (Type A: free inlet, free outlet) 5 Figure 2 Fan inlet noise test 6 Figure 3 Fan outlet noise test 7 Figure 4 Definition of measurement surface 9 Figure C:1 Test device and measurement surface definition for fan casing noise 20 Table 1 Tolerances of instrumentation systems 2 Table 2 Tolerance of sound intensity level difference during on-site inspection 3 Table 3 Tolerance of sound power level measured for standard sound source 3 Table 4 Tolerance of convergence index 11 Table 5 Limits for standard sound source adjustment 14 Table B:1 Minimum number of final measurements (alternative procedure) 18 Table B:2 Tolerance of convergence index (alternative procedure) 18

Foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting: This document is part 4 of GB/T 34877 "Determination of sound power level of fans under standard laboratory conditions for industrial fans": GB/T 34877 has published the following 4 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 13347-4:2004 "Industrial fans - Determination of sound power levels of fans under standard laboratory conditions - Part 4 Points: Sound Intensity Method: A new chapter “Terms and Definitions” has been added to this document: The following minimal editorial changes were made to this document: --- Incorporated the technical corrigendum of ISO 13347-4:2004/Cor1:2006, the outer margin position of the clauses involved It is marked with a vertical double line (‖): Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents: This document was proposed by the China Machinery Industry Federation: This document is under the jurisdiction of the National Technical Committee for Standardization of Fans (SAC/TC187): This document was drafted by: Suzhou Dingyu Energy Saving Equipment Co:, Ltd:, Nantong Datong Baofu Fan Co:, Ltd:, Huiyang Aviation Propeller Co:, Ltd: Company, Shandong Zhangqiu Blower Co:, Ltd:, Jiashan Kagu Electric Equipment Co:, Ltd:, Zhejiang Mingxin Blower Co:, Ltd:, Hunan Liancheng Rail Equipment Co:, Ltd:, Weihai Claytfield Blower Co:, Ltd:, Zhejiang Shangjian Blower Co:, Ltd:, Shenyang Blower Research Institute (Co:, Ltd:), LEITS Intelligent Equipment (Guangdong) Co:, Ltd:, Guangdong Xintailong Environmental Protection Group Co:, Ltd:, Zhejiang Mingzhen Electronics Co:, Ltd: Co:, Ltd:, Zhongshan Aochuang Ventilation Equipment Co:, Ltd:, Xi'an Shaangu Power Co:, Ltd:, Zhejiang Marr Fan Co:, Ltd:, Chongqing Tong Industrial (Group) Co:, Ltd:, Dongguan Fuersheng Intelligent Electromechanical Co:, Ltd:, Novenco Intelligent Ventilation Research Institute (Xi'an) Co:, Ltd: company: The main drafters of this document are: Wang Bin, Cui Xiaojian, Li Xianfeng, Gao Ke, Mo Fumin, Zhu Jiangdong, Ruan Zhixin, Wang Xin, Sun Jianjiang, Zheng Hua, Wu Yanguang, Ou Hongsen, Kong Wanmin, Li Wunan, Shi Liming, Song Jun, Luan Ye, Yao Yao, Li Hanyu, Hu Wenhua, Li Hongye:

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: It is used to determine the acoustic performance of fans with attached devices and is an important test method for measuring the sound power of fans under standard laboratory conditions: Although there are many standards for measuring fan noise in China, they lack universality and cannot be compared in the same direction: ISO 13347-4:2004 document enables my country's ventilator companies to conduct final product quality inspection under the same measurement method standard conditions: Able to participate in international competition: GB/T 34877 aims to establish the determination of the acoustic performance of industrial fans and the important test of sound power under standard laboratory conditions: The method is planned to consist of four parts: --- Part 1: General requirements: The purpose is to determine the acoustic performance of fans and when combined with auxiliary devices: --- Part 2: Reverberation chamber method: The purpose is to establish a method for measuring the sound power level of fans using a reverberation chamber: It is only applicable to the standard It is used under standardized laboratory conditions and is not suitable for field testing due to the increased uncertainty of field testing: --- Part 3: Envelope method: The purpose is to establish a method for determining the sound power level of fans using the envelope method, and to clarify the The laboratory conditions necessary for a successful experiment are few and far between, but few sites can meet these conditions, so it is not suitable for field measurements: --- Part 4: Sound intensity method: The purpose is to establish a method for determining the sound power level of a fan using the sound intensity method, which is only applicable to the specified equipment The airborne sound radiation was measured by the test equipment, and no vibration was measured, nor was the sensitivity of the airborne sound radiation to the vibration effect determined: The size of the ventilator is limited only by practical aspects of the test installation: This document will help my country's ventilator industry and related fields to better understand and implement the relevant technical requirements in the standard, improve the ventilator industry The overall acoustic technology level of the industry: Industrial fans Fans under standard laboratory conditions Determination of sound power level - Part 4: Sound intensity method

1 Scope

This document specifies industrial ventilators as defined in ISO 5801 and ISO 13349 (all parts): This document applies only to specified equipment: Determination of airborne sound radiation by a device excluding the measurement of vibration and the determination of the sensitivity of airborne sound radiation to the effects of vibration: This document is applicable to testing the size of ventilators and is not applicable to testing the actual installation conditions: This document establishes the sound power determined by measuring the sound intensity at the surface surrounding the sound source and provides a basis for the acoustic environment, ambient noise, measurement surface The test setup is designed to be installed in accordance with ISO 5801 and ISO 5801: 13347-2:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document: For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document: ISO 5136 Acoustics—Determination of the sound power radiated into ducts by fans and other ventilation equipment—Duct method Note: GB/T 17697-2014 Acoustics Determination of sound power radiated into ducts by fans and other ventilation equipment Duct method (ISO 5136:2003, IDT) ways) Note: GB/T 1236-2017 Standardized air duct performance test for industrial ventilators (ISO 5801:2007, IDT) ISO 9614-1 Acoustics - Determination of the sound power level of noise sources by sound intensity method - Part 1: Measurements at discrete points discrete points) Note: GB/T 16404-1996 Acoustics Determination of sound power level of noise sources by sound intensity method Part 1: Measurement at discrete points (ISO 9614-1: 1993,EQV) ISO 9614-2 Acoustics-Determination of sound power level of noise sources by sound intensity method Part 2: Scanning measurement Note: GB/T 16404:2-1999 Acoustics Determination of sound power level of noise sources by sound intensity method Part 2: Scanning measurement (ISO 9614-2:1996, IDT) ISO 13347-1:2004 Industrial fans - Determination of sound power levels of fans under standard laboratory conditions - Part 1: General requirements Part 1: General overview) Note: GB/T 34877:1-2023 Industrial fans - Determination of fan sound power level under standard laboratory conditions - Part 1: General requirements (ISO 13347- 1:2004,IDT) ISO 13347-2 Industrial fans - Determination of fan sound power levels under standard laboratory conditions - Part 2: Reverberation chamber method Note: GB/T 34877:2-2023 Industrial fans - Determination of fan sound power level under standard laboratory conditions - Part 2: Reverberation chamber method

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