GB/T 17248.5-2018 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 17248.5-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying accurate environmental corrections Status: Valid GB/T 17248.5: Historical versions
Basic dataStandard ID: GB/T 17248.5-2018 (GB/T17248.5-2018)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 accurate environmental corrections Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A59 Classification of International Standard: 17.140 Word Count Estimation: 34,348 Date of Issue: 2018-12-28 Date of Implementation: 2018-12-28 Older Standard (superseded by this standard): GB/T 17248.5-1999 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 17248.5-2018: Acoustics -- Noise emitted by machinery and equipment -- Determination of emission sound pressure levels at a workstation and at other specified positions applying accurate 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 ICS 17.140 A59 National Standards of People's Republic of China Replace GB/T 17248.5-1999 Noise emitted by acoustic machines and equipment Accurate environmental correction to determine working position and other designations Positional sound pressure level (ISO 11204.2010, IDT) 2018-12-28 released.2018-12-28 implementation State market supervision and administration China National Standardization Administration issued ContentForeword I Introduction II 1 Scope 1 2 Normative references 2 3 Terms and Definitions 2 4 Instrument 6 5 test environment 6 6 Measurements 8 7 Measurement 8 8 Installation and operation of the tested sound source 9 9 microphone position 10 10 measurement 11 11 Measurement uncertainty 13 12 Record content 15 13 Test report 16 Appendix A (normative appendix) Determination of the environmental correction of the local environment correction value K3 of the working position 17 Appendix B (Normative Appendix) Background Noise Band Measurement Criterion 20 Appendix C (Informative Appendix) Guide to Measurement Uncertainty Evaluation 22 Appendix D (informative) Method principle 27 Appendix E (informative) Test bench example 28 Reference 29ForewordGB/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 fifth 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 17248.5-1999 "Noise working position and other specified position emission emitted by acoustic machines and equipment Sound environment measurement environment correction method. Compared with GB/T 17248.5-1999, the main technical changes are as follows. --- Added some background noise criteria (see 5.4); --- Increased the assessment of measurement uncertainty (see Chapter 11). This section uses the translation method equivalent to ISO 11204.2010 "acoustic machines and equipment emitted noise using accurate environmental corrections 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 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 was drafted by. Institute of Acoustics, Chinese Academy of Sciences, China Institute of Metrology, Shanghai Shenhua Acoustic Equipment Co., Ltd., Tongji University, Hangzhou Aihua Instrument Co., Ltd., Shenzhen Zhongya Electromechanical Industry Co., Ltd., Anhui Weiwei Institute of Vibration and Noise Reduction Technology, Changsha Aobang Ring Bao Industrial Co., Ltd., Hefei University of Technology, Beijing Labor Protection Science Research Institute, Zhejiang University of Science and Technology, Shanghai Environmental Science Research Institute. The main drafters of this section. Lu Yadong, He Longbiao, Li Xiaodong, Cheng Mingkun, Yang Jun, Yin Yi, Liu Danxiao, Zhang Mingfa, Yu Wuzhou, Mao Dongxing, Xiong Wenbo, Mo Jianyan, Fang Qingchuan, Li Jun, Li Zhiyuan, Li Xiaokuan, Hu Wencheng, Li Zhengguang, Xu Xin, Zhu Wenying, Zhou Yude. The previous versions of the standards replaced by this section are. ---GB/T 17248.5-1999.IntroductionGB/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 fifth part of GB/T 17248, which specifies the test. Various methods of measuring sound pressure levels at working locations and other specified locations near machines and equipment. The method specified in this section differs from ISO 11201 [16] in the application of local environmental corrections, and is used in accordance with ISO 11202 [17]. Accurately measure the emitted sound pressure level on the reference measurement surface to determine the difference in the directivity of the sound radiation of the machine under test. To meet the test environment It is necessary to measure the acoustic characteristics of the test chamber and to determine the local environmental correction suitable for the measured sound pressure level. Use the methods specified in this section, The measurement results obtained are level 2 accuracy (engineering level) or level 3 accuracy (simple level). The methods specified in this section are generally applicable to on-site measurements. There is no need to assume acoustic radiation or sound source direction because the sound pressure on the envelope is measured. The direction is determined at the level, and the accuracy level obtained under the existing conditions is engineering grade or simple grade. 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 Accurate environmental correction to determine working position and other designations Positional sound pressure level1 Scope1.1 Overview This part of GB/T 17248 specifies the measuring machine in the working position and other specified locations nearby in an environment that meets certain requirements. A method for transmitting sound pressure levels by devices and equipment (see Appendix D for method principles). 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, and sometimes these locations are referred to as bystanders. The transmitted sound pressure level can be measured by A weighting, and if necessary, the band sound pressure level and the C weighted peak sound pressure level can be used according to this part. measuring. Note 1. ISO 11200 [15] gives a general overview of the contents of ISO 11200 [15] ~ ISO 11205 [19]. This section gives a method for determining the local environmental correction value (specifying its allowable maximum value), which is used to determine the emission sound pressure level. The effect of the reflective surface outside the plane on which the sound source is placed is excluded. The correction value and the average sound pressure level of the measurement surface, the specified position measurement The resulting sound pressure level, as well as the environmental correction or the equivalent sound absorption area between tests. The measurement method specified in this section can obtain the results of Level 2 Accuracy (Engineering Level) or Level 3 Accuracy (Simple Level). Correction value applies to Background noise and the acoustic environment described above. At the same time, the installation and operation of the tested sound source, as well as the working position or other specified position, are given. Description of the location selection. One of the purposes of the measurement is to provide a given series under specified environmental conditions and standard installation and operating conditions. The performance of different machine equipment units 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 sound source type 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 to be tested” in this section is used to refer to a 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 applies to one or more reflective surfaces that meet specified requirements. Indoor or outdoor environment. 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; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 17248.5-2018_English be delivered?Answer: Upon your order, we will start to translate GB/T 17248.5-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 17248.5-2018_English with my colleagues?Answer: Yes. 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