GB/T 17248.2-2018 English PDFUS$644.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 17248.2-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections Status: Valid GB/T 17248.2: Historical versions
Basic dataStandard ID: GB/T 17248.2-2018 (GB/T17248.2-2018)Description (Translated English): Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A59 Classification of International Standard: 17.140 Word Count Estimation: 34,396 Date of Issue: 2018-12-28 Date of Implementation: 2018-12-28 Older Standard (superseded by this standard): GB/T 17248.2-1999 Quoted Standard: GB/T 3785.1-2010; GB/T 15173-2010; ISO 3744; ISO 3745; ISO 3746; ISO 5725-1; ISO 5725-2; ISO 5725-3; ISO 5725-4; ISO 5725-5; ISO 5725-6; ISO 12001; ISO/IEC GUIDE 98-3-2008; IEC 61260-1995 Adopted Standard: ISO 11201-2010, IDT Regulation (derived from): National Standard Announcement No. 17 of 2018 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the method for measuring the sound pressure level at a working position near a machine or equipment and at other specified locations in a near free field above a reflective surface (see Appendix D for method principles). The working position is the position of the operator, which can be located in an open space, in a workshop where the sound source is operated, in an operating room fixedly connected to the sound source to be tested, or in an enclosed space away from the sound source. Other designated locations may be located near a work location, or near a person/unattended machine, which is sometimes referred to as a bystander's location. The transmitted 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 pressure level can be measured according to the present standard. The measurement method specified in this standard can obtain level 1 accuracy (precision level) or level 2 accuracy ( GB/T 17248.2-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections---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. Acoustics--Noise emitted by machinery and equipment--Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections ICS 17.140 A59 National Standards of People's Republic of China Replace GB/T 17248.2-1999 Noise emitted by acoustic machines and equipment Environmental correction can be ignored above a reflective surface Approximate free field to determine the working position and Launch sound pressure level at other specified locations Correction (ISO 11201.2010, IDT) 2018-12-28 released.2018-12-28 implementation State market supervision and administration China National Standardization Administration issued ContentForeword I Introduction III 1 Scope 1 2 Normative references 2 3 Terms and Definitions 2 4 Instrument 6 5 test environment 6 6 Measurements 9 7 Measurement 9 8 Installation and operation of the tested sound source 9 9 microphone position 11 10 measurement 12 11 Measurement uncertainty 13 12 Record contents 16 13 Test report 17 Appendix A (Normative) Accuracy Rating (Level 1 or Level 2) 18 Appendix B (Normative Appendix) Background Noise Band Measurement Criterion 19 Appendix C (informative) Guide to measurement uncertainty assessment 21 Appendix D (informative) Method principle 26 Appendix E (informative) Test bench example 27 Reference 28ForewordGB/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 second 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 17248.2-1999 "Noise working position and other specified position emission emitted by acoustic machines and equipment The sound pressure level is measured by an engineering method that approximates the free field above a reflecting surface. Major technical changes compared to GB/T 17248.2-1999 as follows. --- Added terms and definitions (see Chapter 3); --- Added test methods with different accuracy (see Chapter 11); --- The content of measurement uncertainty has been greatly supplemented (see Chapter 11 and Appendix C, Chapter 11 of the.1999 edition and Record C). This section uses the translation method equivalent to ISO 11201.2010 "Acoustic machines and equipment emit noise above a reflective surface The approximate free field of the environmental correction can be ignored to determine the operating sound pressure level 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 standard are as follows. ---GB/T 3241-2010 Electroacoustic octave and fractional octave filter (IEC 61260.1995/Amd.1.2001, 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) Minute)]; ---GB/T 6882-2016 Acoustic sound pressure method for the determination of noise source sound power level and sound energy level anechoic chamber and semi-anechoic chamber precision Law (ISO 3745.2012, IDT); ---GB/T 19052-2003 Guidelines for the drafting and presentation of noise and noise test specifications for acoustic machines and equipment (ISO 12001..1996, IDT). This section has made the following editorial changes. --- 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 drafted by. Zhejiang University, Zhejiang University of Science and Technology, Beijing Lande Technology Co., Ltd., Tongji University, Chinese Academy of Sciences Research Institute, Changsha Aobang Environmental Protection Industry Co., Ltd., Shenzhen Zhongya Electromechanical Industry Co., Ltd., Beijing Labor Protection Science Research Institute, Anhui Vocational Technical College, Harbin Engineering University, Shanghai Environmental Science Research Institute. The main drafters of this section. Yan Guoqing, Li Zhengguang, Mao Dongxing, Yu Wuzhou, Cha Yingjie, Cheng Mingkun, Lu Yadong, Li Xiaodong, Liu Danxiao, Mo Jianyan, Fang Qingchuan, Li Xiaokuan, Song Ruixiang, Bao Junyao, Zhang Lin, Zhou Yude, Zhu Wenying, Xu Xin. The previous versions of the standards replaced by this section are. ---GB/T 17248.2-1999.IntroductionGB/T 17248 (corresponding to ISO 11200 [15] ~ ISO 11205 [19]) is a sub-standard that specifies the measuring machine And various methods of transmitting sound pressure levels at working locations and other specified locations near the equipment. How to select the test machine equipment to emit sound pressure The specific method of the level, the first part of GB/T 17248 gives the guiding principle. This part is the second part of GB/T 17248, which stipulates Measuring the sound pressure level at a working position near the machine or equipment component and at other specified locations in an approximate free field above a reflecting surface One way. The method specified in this section differs from the other parts of GB/T 17248 (corresponding to ISO 11200 [15] ~ ISO 11205 [19]) This section does not make environmental corrections. This section specifies indoor/outdoor level 1 accuracy (precision level) and level 2 accuracy (engineering level) measurements. Environmental requirements. Precision measurement of level 1 accuracy is usually performed in a semi-anechoic chamber or outdoors that meets environmental requirements. Follow the technique defined later The specification, in some cases, provides a condition in a factory environment in a large, flat area with no reflectors. The previous edition of this section (equivalent to ISO 11201.1995) gives only the results of Level 2 accuracy. The level 2 standard given in this section The accuracy method is basically the same as that given in ISO 11201.1995. This section also gives a more accurate level 1 accuracy method. This part of the make The user and reference to the noise test specification drafter in this section should clearly indicate which method is used (level 1 accuracy or level 2 Authenticity). 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. For the calculation method of the sound pressure level near a machine running separately in the workshop, see ISO /T R11690-3 [20], generally the difference between the two is 1dB~5dB, and the difference will be even greater in extreme cases. Noise emitted by acoustic machines and equipment Environmental correction can be ignored above a reflective surface Approximate free field to determine the working position and Launch sound pressure level at other specified locations1 Scope1.1 Overview This part of GB/T 17248 specifies the approximate free field above a reflecting surface, the working position near the machine or equipment and others. The measurement method of the sound pressure level at the specified position (see Appendix D for the principle of the method). The working position is where the operator is located, it can be located Open space, in the workshop where the tested sound source is running, in the operating room fixedly connected to the measured sound source or in the enclosed space away from the sound source. Other finger The location can be located near the work location, or near the person/unattended machine, which is sometimes referred to as the bystander's location. 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]. The measurement method specified in this section can obtain the results of Level 1 Accuracy (Precision Level) or Level 2 Accuracy (Engineering Level). Background noise only Without correcting the acoustic environment. For the installation and operation of the tested sound source, as well as the working position and other specified position microphone placement bits The choices given are given in specific instructions. One of the purposes of the measurement is. under the specified environmental conditions and standard installation and operating conditions, Compare the performance of different machine units in a given series. Note 2. The data obtained can also be used for the marking and verification of emission values as specified in ISO 4871 [8]. 1.2 Types of noise and noise sources 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. This section requires the test environment to be a reflective plane (indoor or outdoor) The approximate free field above. 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; e) the location of the bystander, the person occupying the position is not responsible for the operation of the machine, but may be temporarily or always in its vicinity; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 17248.2-2018_English be delivered?Answer: Upon your order, we will start to translate GB/T 17248.2-2018_English as soon as possible, and keep you informed of the progress. 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