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GB/T 17248.3-2018 English PDF

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GB/T 17248.3-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying approximate environmental corrections
Status: Valid

GB/T 17248.3: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 17248.3-2018English724 Add to Cart 4 days [Need to translate] Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying approximate environmental corrections Valid GB/T 17248.3-2018
GB/T 17248.3-1999English679 Add to Cart 3 days [Need to translate] Acoustics. Noise emitted by machinery and equipment. Measurement of emission sound pressure levels at a work station and at other specified positions. Survey method in situ Obsolete GB/T 17248.3-1999

PDF similar to GB/T 17248.3-2018


Standard similar to GB/T 17248.3-2018

GB/T 15173   GB/T 19889.1   GB/T 18696.1   GB/T 17249.1   GB/T 17248.1   GB/T 17248.5   

Basic data

Standard ID GB/T 17248.3-2018 (GB/T17248.3-2018)
Description (Translated English) Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying approximate environmental corrections
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A59
Classification of International Standard 17.140
Word Count Estimation 38,356
Date of Issue 2018-12-28
Date of Implementation 2018-12-28
Older Standard (superseded by this standard) GB/T 17248.3-1999
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 17248.3-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying approximate environmental corrections



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Acoustics--Noise emitted by machinery and equipment--Determination of emission sound pressure levels at a work station and at other specified positions applying approximate environmental corrections ICS 17.140 A59 National Standards of People's Republic of China Replace GB/T 17248.3-1999 Noise emitted by acoustic machines and equipment Approximate environmental correction to determine working position and other designations Positional sound pressure level (ISO 11202.2010, IDT) 2018-12-28 released.2018-12-28 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword III Introduction IV 1 Scope 1 2 Normative references 2 3 Terms and Definitions 2 4 Instrument 6 5 Method 7 to determine the local environment correction value K3A 6 Test environment 7 7 Measurements 9 8 Measurement 9 9 Installation and operation of the tested sound source 9 10 microphone position 11 11 measurement 12 12 Measurement uncertainty 14 13 Record contents 16 14 Test Report 17 Appendix A (Normative Appendix) Determination of the environmental correction of the local environment correction value K3 of the working position 18 Appendix B (Normative Appendix) Background Noise Band Measurement Criterion 23 Appendix C (informative) Guide to measurement uncertainty assessment 25 Appendix D (informative) Method principle 30 Appendix E (informative) Test bench example 31 Reference 32

Foreword

GB/T 17248 "Noise emitted by acoustic machines and equipment" includes the following six parts. ---Guidelines for the use of basic standards for measuring sound pressure levels at work locations and other designated locations (GB/T 17248.1); --- Approximate free-field measurement of the operating position and other specified positions of the sound pressure level can be ignored above a reflective surface (GB/T 17248.2); ---Approximate environmental correction to determine the sound pressure level of the working position and other specified locations (GB/T 17248.3); --- Determine the sound pressure level of the working position and other specified positions by the sound power level (GB/T 17248.4); ---Accurate environmental correction to determine the sound pressure level of the working position and other specified locations (GB/T 17248.5); --- Sound intensity method on-site measurement of working position and other specified locations to launch sound pressure level engineering method (GB/T 17248.6). This part is the third part of GB/T 17248. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 17248.3-1999 "Noise working position and other specified position emission emitted by acoustic machines and equipment Simple method of measuring the sound pressure level. Compared with GB/T 17248.3-1999, the main technical changes are as follows. --- Added terms and definitions (see Chapter 3); --- Added test methods with different accuracy (see Chapter 12); --- The content of measurement uncertainty has been greatly supplemented (see Chapter 12 and Appendix C, Chapter 12 and Appendix C of the.1999 edition). This section uses the translation method equivalent to ISO 11202.2010 "Acoustic machines and equipment emitted noise using approximate environmental correction Determine the sound pressure level of the launch at the working position and other specified locations. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 3241-2010 Electroacoustic octave and fractional octave filter (IEC 61260.1995, MOD) ---GB/T 3767-2016 Acoustic sound pressure method for the determination of noise source sound power level and sound energy level reflection surface above the approximate free field Engineering method (ISO 3744.2010, IDT) ---GB/T 3768-2017 Acoustic sound pressure method for the determination of noise source sound power level and sound energy level using the envelope above the reflection surface Simple method of measuring surface (ISO 3746.2010, IDT) ---GB/T 6379 (all parts) Accuracy of measurement methods and results (correctness and precision) [ISO 5725 (all parts)] ---GB/T 19052-2003 Noise and noise test specifications for acoustic machines and equipment - Guidelines for drafting and presentation (ISO 12001.1996, IDT) This section has made the following editorial changes. --- Change the word "9.5" in the second paragraph of A.2.2 to "10.4", the original text is incorrect (see A.2.2 in Appendix A); --- Added note in Table B.1. It is recommended to use caution for individual parameters in the table (see Table B.1 in Appendix B). This part was proposed by the Chinese Academy of Sciences. This part is under the jurisdiction of the National Acoustic Standardization Technical Committee (SAC/TC17). This section was drafted by. Shenzhen Zhongya Electromechanical Industry Co., Ltd., Anhui Weiwei Institute of Vibration and Noise Reduction Technology, Shanghai Xinhua Net Environmental Protection Worker Cheng Co., Ltd., Institute of Acoustics, Chinese Academy of Sciences, Tongji University, Hangzhou Aihua Instrument Co., Ltd., Beijing Labor Protection Science Research Institute, Northwestern Polytechnical University, Zhejiang University of Science and Technology, Guangdong Qiyuan Architectural Engineering Design Institute Co., Ltd., Xiamen Jiada Acoustics Technology Co., Ltd. The main drafters of this section. Fang Qingchuan, Cheng Mingkun, Li Zhiyuan, Li Xiaodong, Liu Danxiao, Lu Yadong, Yang Jun, Yu Wuzhou, Mao Dongxing, Wang Bing, Xiong Wenbo, Zhang Bin, Li Xiaokuan, Li Bin, Chen Ke'an, Li Zhengguang, Luo Qinping, Lin Jiaxiang, Xu Xin. The previous versions of the standards replaced by this section are. ---GB/T 17248.3-1999.

Introduction

GB/T 17248 (corresponding to ISO 11200 [15] ~ ISO 11205 [19]) is a series of standards, this standard specifies measuring machines and equipment Various methods of transmitting sound pressure levels in nearby working locations and other designated locations. How to select the test machine equipment to emit sound pressure level The specific method, the first part of GB/T 17248 gives the guiding principle. This part is the third part of GB/T 17248, which specifies A method of measuring the transmitted sound pressure level in the field at a working location near a machine or equipment and at other designated locations. The measurement methods specified in this section differ from ISO 11201 [16] in that local environmental corrections are used. This part and ISO 11204 [18] differs in that the directivity of the machine's acoustic radiation is measured using fewer points of measurement or even an approximation of additional measurements. Determine the acoustic characteristics of the test room to determine whether the test environment requirements are met, and determine the sound pressure level using the acoustic characteristics of the test room. The environmental impact of the measurement is corrected. The measurement results obtained by the method specified in this section are level 2 accuracy (engineering level) or level 3 accuracy (simple) Easy level). This section specifies two methods for local environmental correction. The first method (see A.1) is based on the assumption that the sound pressure level at the working position or at the specified position is clear from these positions. See the clear machine parts, the noise generated by the radiation under free-propagating conditions. Based on this assumption, it is only necessary to determine local environmental corrections. Sound pressure measurement at the working position and acoustic characterization of the room. The second method (see A.2) is more general. It is not necessary to make assumptions about the directivity of the noise radiation or the position of the sound source, because of the noise radiation Directivity is determined by an approximation that requires little additional measurement position. Determining the accuracy of the measurement results takes into account the approximation of this method characteristic. Usually the sound pressure level generated by a machine or equipment operating in a normal environment is less than or equal to the sound pressure level generated by the sound pressure level. The effects of background noise and the effects of other reflected noise in addition to the ground reflections placed on the machine under test are excluded. For machines in the workshop Determination or calculation of sound pressure level at the operator's position during operation, sound power level and sound pressure level (and information related to shop characteristics or reflections and All noise from other sources or machines needs to be obtained. A calculation method for the sound pressure level near a machine operating separately in the workshop See ISO /T R11690-3 [20], usually observed with a difference of 1dB ~ 5dB, in extreme cases the difference will be greater. Noise emitted by acoustic machines and equipment Approximate environmental correction to determine working position and other designations Positional sound pressure level

1 Scope

1.1 Overview This part of GB/T 17248 specifies the on-site measurement of the sound pressure level at the working position and other specified locations near the machine or equipment. The method (see Appendix D for the principle of the method). The working position is the position of the operator, which can be located in the open space and the sound source is operated. In the workshop, in the operating room fixedly connected to the measured sound source or in the enclosed space away from the sound source. Other specified locations can be in the working position Nearby, or near/unattended machines, these locations are sometimes referred to as bystanders. The emitted sound pressure level is measured by the A-weighted sound level, and if necessary, the band sound pressure level and the C-weighted peak emission sound can be measured according to this part. Pressure level. Note 1. ISO 11200 [15] gives a general overview of the contents of ISO 11200 [15] ~ ISO 11205 [19]. In order to eliminate the influence of other acoustic reflection surfaces other than the plane where the machine is placed, this section gives the determination of the local environmental correction value (given The method of the specific upper limit). The correction value is used to test the equivalent sound absorption area and radiation characteristics of the room (the position or orientation of the sound source at the working position) Based on sex). The measurement method specified in this section can obtain the results of Level 2 Accuracy (Engineering Level) or Level 3 Accuracy (Simple Level). Corrected value Used for background noise and the acoustic environment described above. For the installation and operation of the machine under test, as well as the working position and other specified location The choices are given specific instructions. One of the purposes of the measurement is to give a given environmental condition and standard installation and operating conditions. The performance of different machine units in the series is compared. Note 2. The data obtained can also be used for the marking and verification of emission values as specified in ISO 4871 [9]. 1.2 Noise and noise source types The methods specified in this section apply to all types of noise as defined in ISO 12001, including steady-state, unsteady, undulating, 猝 Sounds and so on. The methods specified in this section apply to noise sources of all types and sizes. Note. “Machine” or “Source of Sound Source” in this section refers to the machine or equipment component. 1.3 Test environment The type of test environment affects the accuracy of the transmitted sound pressure level measurement. In this section, any room that meets the requirements described in Chapter 6 It is applicable. These requirements for testing rooms are not as stringent as ISO 11201 [16], especially with regard to the acoustic properties of the environment. 1.4 Working position and other specified locations This section applies to working positions and other specified locations where the sound pressure level of the launch is to be measured. The locations where measurements can be made include. a) the working position near the sound source being tested, as is the case with many industrial machines and household appliances; b) the working position in the operating room, which is part of the machine under test, as is the case with many trucks and bulldozers; c) working position in part or all of the enclosed space (or behind the barrier) belonging to the manufacturer's machinery and equipment Part of the body; d) the working position of the tested sound source partially or completely closed, which is encountered in some large industrial machines;

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