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GB/T 3767-2016 English PDF

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GB/T 3767-2016: Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane
Status: Valid

GB/T 3767: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 3767-20161354 Add to Cart 3 days Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane Valid
GB/T 3767-1996RFQ ASK 5 days Acoustics. Determination of sound power levels of noise sources using sound pressure. Engineering method in an essentially free field over a reflecting plane Obsolete
GB 3767-1983599 Add to Cart 4 days Determination of sound power levels of noise sources--Engineering method and quasi-engineering method Obsolete

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Basic data

Standard ID: GB/T 3767-2016 (GB/T3767-2016)
Description (Translated English): Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A59
Classification of International Standard: 17.140.01
Word Count Estimation: 68,675
Date of Issue: 2016-02-24
Date of Implementation: 2016-09-01
Older Standard (superseded by this standard): GB/T 3767-1996
Regulation (derived from): National Standard Announcement No
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 3767-2016: Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane



---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 - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane ICS 17.140 A59 National Standards of People's Republic of China Replace GB/T 3767-1996 Acoustic sound pressure method for determining noise source sound power level and Approximate free field above the acoustic energy level reflecting surface Engineering method (ISO 3744.2010, IDT) 2016-02-24 released.2016-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 test environment 6 5 Instrument 9 6 Determination, location, installation and operation of the measured sound source 10 7 Reference body and measuring surface 11 8 Determination of sound power level and sound energy level 15 9 Measurement uncertainty 20 10 Record contents 23 11 Test report 24 Appendix A (Normative Appendix) Acoustic Environmental Identification Method 25 Appendix B (Normative) Microphone array on the hemispherical measuring surface 29 Appendix C (Normative) Microphone array 36 on the parallelepiped measuring surface Appendix D (informative) Cylindrical measuring surface microphone array 46 Appendix E (Normative Appendix) Calculate the A-weighted sound power level and the A-weighted sound energy level 50 from the band level Appendix F (Normative) Another type of microphone array 52 that directly measures the A-weighted sound pressure level on the hemispherical measurement surface 52 Appendix G (Normative) Sound power level and sound energy level under standard meteorological conditions 54 Appendix H (Informative) Guide to Measurement Uncertainty Information Progress Guide 55 References 64

Foreword

This standard is one of the series of standards for determining the sound power level of noise sources by sound pressure method. This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 3767-1996 "Acoustic sound pressure method to determine the approximate free field above the sound level of the noise source Chengfa. This standard is compared with GB/T 3767-1996. The main changes are as follows. --- Added terms and definitions; --- Increased measurement of sound energy level; --- The content of measurement uncertainty has been greatly supplemented; --- Raise the "background noise standard" to "background noise criterion" and formulate relative value criteria and absolute value criteria respectively; --- Revised the expression of the definition of the directivity index; --- Increased cylindrical measuring surface; the position of the microphone of the hemispherical discrete pure sound source increased from 10 to 20. This standard uses the translation method equivalent to ISO 3744.2010 "acoustic sound pressure method to determine the noise source sound power level and sound energy level The Engineering Method for Approximating Free Field Above the Surface (English Version). 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 classification octave filter (IEC 61260.1995, MOD) ---GB/T 4129-2003 Acoustics Performance and calibration requirements for standard sound sources for sound power level determination (ISO 6926. 1999, IDT) ---GB/T 6379 (all parts) Accuracy (accuracy and precision) of measurement methods and results [ISO 5725 (all parts)] ---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) This standard was proposed by the Chinese Academy of Sciences. This standard is under the jurisdiction of the National Acoustic Standardization Technical Committee (SAC/TC17). This standard was drafted. Institute of Acoustics, Chinese Academy of Sciences, Shenzhen Zhongya Electromechanical Industry Co., Ltd., Hefei University of Technology, Tongji University, Anhui Vocational and Technical College, Zhejiang University, Shanghai Academy of Environmental Sciences, China Institute of Metrology. The main drafters of this standard. Cheng Mingkun, Lu Yadong, Tian Jing, Fang Qingchuan, Li Zhiyuan, Mao Dongxing, Bao Junyao, Qi Guoqing, Zhu Wenying, Xu Xin, Yin Wei, He Longbiao. The previous versions of the standards replaced by this standard are. ---GB 3767-1983; GB/T 3767-1996.

Introduction

This standard corresponds to ISO 3741, ISO 3743 to ISO 3747 GB/T 6881.1, GB/T 6881.2, GB/T 6881.3, One of the GB/T 3767, GB/T 3768, GB/T 6882 and GB/T 16538 series standards. This series of standards specifies various methods for determining the sound power level and sound energy level of noise sources such as machines, equipment and their accessories. GB/T 14367 provides a general guide to the choice of method. The choice of measurement method depends on the available test facility environment and sound power The precision required for the level and acoustic energy levels. It may be necessary to establish a noise test specification for individual noise sources (see GB/T 19052) to Appropriately select the acoustic measuring surface and microphone array allowed by GB/T 6881.1 to GB/T 16538 series standard, and give the test unit The required installation, loading and operating conditions are obtained to obtain the sound power level and sound energy level under this condition. A given sound source is emitted to the test loop The sound power of the environment is calculated from the mean square sound pressure and its surface area measured on the imaginary measuring surface surrounding the sound source. The acoustic energy of a single acoustic event is made up of it The sound power and its duration are calculated. The method specified in this standard allows the determination of the sound power level and the acoustic energy level of the frequency band or A weight. When the measurement requires higher accuracy, you can refer to GB/T 6882, or GB/T 6881.1 [2], GB/T 16404 [13-15] Line measurement. If the measurement environment related criteria specified in this standard are not met, you can refer to the other standards in this series, or refer to GB/T 16404 [13-15]. This standard describes the measurement of the level 2 accuracy specified in GB/T 19052 in the space near the free surface of the reflecting surface. method. Such a measurement environment can be a specially designed test room, an industrial building or an outdoor. Ideally, the test source should be installed. On the acoustic reflection plane of a large open space. For sound sources that are usually installed on the ground inside the building, you need to consider nearby objects, walls and ceilings. The unwanted reflection of the board and the correction of residual background noise that occurs there. Acoustic sound pressure method for determining noise source sound power level and Approximate free field above the acoustic energy level reflecting surface Engineering method

1 Scope

1.1 Overview This standard specifies the use of an enclosed sound source (machine or equipment) in an approximately free sound field environment near one or more reflection planes. A method of measuring the sound pressure level measured on a surface to determine the sound power level or sound energy level of the noise source. Use these measurements to calculate the noise source Band or A-weighted sound power level (or acoustic energy level in the case of impulse noise or transient noise). Note. For a given noise source, different shapes of the measurement surface may get different sound power level estimates, and a noise test procedure is developed accordingly (see Details on the selection of the measuring surface are given in GB/T 19052). 1.2 Types of noise and noise sources The methods specified in this standard apply to the various types of noise (steady state, unsteady state, undulation, creaking, etc.) defined in GB/T 19052. This standard applies to sound sources of various types and sizes (such as fixed equipment or slow moving equipment, when the measurement conditions are met). Devices, machines, components, components, etc.). Note. This standard may not be suitable for super high or long sound sources, such as chimneys, pipes, conveyors, multi-source industrial equipment. In this case, for Acoustic emission measurement of bulk noise sources, noise test procedure GB/T 19052 provides an alternative method. 1.3 Test environment The test environment suitable for measurement according to this standard can be located indoors or outdoors, and the noise source to be tested is installed in one or more acoustic reflections. On or near the surface. The ideal environment is a completely open space with no boundaries or no other than a reflective plane with noise sources installed. A reflective surface (for example, a qualified semi-anechoic chamber), but in a less than ideal environment, a method of correction (within a specified range) is specified. 1.4 Measurement uncertainty The uncertainty information of the specified frequency band and the A-weighted frequency sound power level and sound energy level measured according to this standard is given. uncertainty It meets the level 2 accuracy of GB/T 19052 (engineering level).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 3785.1-2010 Electroacoustic sound level meters - Part 1. Specification (IEC 61672-1.2002, IDT) GB/T 15173-2010 Electroacoustic Acoustic Calibrator (IEC 60942.2003, 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) ISO 3382-2 Acoustic parameters for acoustic test rooms - Part 2. Res. Measurementofroomacousticparameters-Part 2.Reverberationtimeinordinaryrooms) ISO 3745 acoustic sound pressure method for the determination of noise source sound power level and sound energy level anechoic chamber and semi-anechoic chamber precision method (Acoustics-Determinationofsoundpowerlevelsandsoundenergylevelsofnoisesourcesusing soundpressure-Precisionmethodsforanechoictestroomsandhemi-anechoictestrooms) ISO 5725 (all parts) Accuracy (correctness and precision) of measurement methods and results [Accuracy(truenessandpre- Cision)ofmeasurementmethodsandresults] ISO 6926 Acoustics Performance and calibration requirements for standard sound sources for sound power level determination (Acoustics-Requirements Fortheperformanceandcalibrationofreferencesoundsourcesforthedeterminationofsoundpower Levels) ISO /IEC 98-3 Measurement Uncertainty Part 3. Guidance for the Expression of Uncertainty in Measurement (GUM.1995) [Uncertaintyofmeasurement-Part 3. Guidetotheexpressionofuncertaintyinmeasurement(GUM 1995)] IEC 61260.1995 Electroacoustic octave and fractional octave filters (Electroacoustics-Octave-bandandfrac- Tional-octave-bandfilters)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Sound pressure soundpressure The difference between the instantaneous pressure and the static pressure. Note 1. Quoted from ISO 80000-8.2007 [21], 8-9.2. Note 2. The unit of sound pressure is Pascal (Pa). 3.2 Sound pressure level soundpressurelevel Lp The ratio of the square of the sound pressure p to the square of the reference sound pressure p0 is taken as 10 times the logarithm of the base 10, expressed in decibels (dB). Lp=10lg P2 P20 (1) In the formula. P0---reference value, p0=20 μPa. [ISO /T R25417.2007 [20], 2.2] Note 1. If frequency and time weighting or a specific frequency band is specified in GB/T 3785.1, it is indicated by an appropriate subscript, for example, LpA indicates A weighting sound. Pressure level. Note 2. This definition refers technically to ISO 80000-8.2007 [21], 8-22. 3.3 Time average sound pressure level time-averagedsoundpressurelevel Lp,T The ratio of the time average of the sound pressure p squared to the square of the reference value over the specified duration T (starting at t1, ending at t2), 10 times the logarithm of the bottom 10, expressed in decibels (dB). Lp, T = 10lg T∫ T2 T1 P2(t)dt P20 Êê Úú (2) In the formula. P0---reference value, p0=20 μPa. Note 1. Since the time-averaged sound pressure level should be measured within a certain measurement period, the subscript "T" is generally omitted. Note 2. When the time average sound pressure level is weighted by A, it can be expressed as LpA, T, which is usually expressed by the symbol LpA. Note 3. Quoted from ISO /T R25417.2007 [20], 2.3. 3.4 Single event time integral sound pressure level singleeventtime-integratedsoundpressurelevel LE The square of the sound pressure of a single, single-shot event (beep or transient) for a certain period of time T (starting at t1, ending at t2) The ratio of the integral to the reference value is taken as 10 times the logarithm of the base 10 and expressed in decibels (dB). LE=10lg T2 T1 P2(t)dt E0 (3) In the formula. E0---reference value, E0 = 20 μPa ( ) 2 s = 4 × 10 -10 Pa 2 s. Note 1. This value can be calculated by the formula Lp, T 10lg T0 Obtained, where T0=1s. Note 2. When used to measure acoustic illumination (see GB/T 17249.1-1998 [19]), this quantity is often referred to as the “exposed sound level” (see ISO /T R25417.2007 [20], 2.7). 3.5 Measurement time periodmeasuretimeinterval Part or multiple operating periods or operating periods used to determine the time-averaged sound pressure level of the noise source being measured. Note. The unit of measurement time is seconds (s). 3.6 Free sound field freesoundfield The sound field in a uniform, isotropic medium without boundaries. Note. In fact, the free sound field is the sound field that is negligible in the reflection of the boundary or other interfering objects within the test frequency range. 3.7 Free sound field freesoundfieldoverareflectingplane on the reflecting plane Above the infinitely reflective surface, there is no half-space free field of other obstacles. 3.8 Reflecting surface Install the acoustic reflection plane of the noise source being measured. 3.9 Test frequency range frequencyrangeofinterest In general, the frequency range of the test includes a octave band with a center frequency of 125 Hz to 8000 Hz (for a 1/3 octave band, the center frequency The rate is 100Hz~10000Hz). Note. For specific test purposes, the frequency range can be extended or reduced if the test environment and instrument performance are met during the rebuilt frequency range. Minus, but the test frequency range should be indicated in the test report. 3.10 Reference body referencebox A test rig that surrounds all the main acoustic radiating components of the tested sound source and the installed sound source, and terminates in the reflection plane of the measured sound source An imaginary parallelepiped on the top. Note. If necessary, in order to be able to measure the sound pressure level next to the noise source according to GB/T 17248.2, the test bench should be as small as possible. 3.11 Sound source feature size characteristicsourcedimension D0 The distance from the origin of the coordinate system to the farthest point of the reference body. Note. The unit of sound source feature size is meters (m). 3.12 Measuring distance measurementdistance The distance from the reference body to the parallelepiped measuring surface. Note. The unit of measurement distance is meters (m). 3.13 Measuring radius measurementradius The radius of the hemisphere, 1/2 hemisphere, or 1/4 hemisphere measurement surface. Note. The unit of measurement radius is meters (m). 3.14 Measuring surface measurementsurface The area is S, which surrounds the measured sound source and arranges the imaginary plane of the sound pressure level on the microphone measuring point, which terminates in the opposite direction of the sound source. Shooting surface. 3.15 Background noise backgroundnoise All noise from other sources than the noise source being measured. Note. Background noise includes air noise, structural vibration noise, and electrical noise in the instrument. 3.16 Background noise correction value backgroundnoisecorrection K1 Correction of the effect of background noise on the average (energy average) of the time-averaged sound pressure levels of all microphone positions on the measurement surface. Note 1. The background noise correction value is expressed in decibels (dB). Note 2. Background noise correction is related to frequency. For the frequency band, the correction value is expressed by K1f, where f is the corresponding center frequency; for A weighting, the correction value is used. K1A said. 3.17 Environmental correction value K2 Sound reflection and sound absorption of the test environment. Average value (energy average) of the time average sound pressure level of all microphone positions on the measurement surface The correction is ringing. Note 1. The environmental correction value is expressed in decibels (dB). Note 2. Environmental corrections are related to frequency. For the frequency band, the correction value is recorded as K2f, where f represents the center frequency of the relevant frequency band, and is recorded under the A-weighting case. For K2A. Note 3. In general, the environmental correction depends on the area S of the measuring surface, and usually K2 increases as S increases. 3.18 Time averaged sound pressure level of the measuring surface surfacetime-averagedsoundpressurelevel Lp Correction of background noise K1 and environment K2 on all microphone positions on the measuring surface or continuous measurement path of the microphone The average of the time average sound pressure levels (energy average). Note. The average sound pressure level of the measurement surface is expressed in decibels (dB). 3.19 Single event time integration sound pressure level surfacesingleeventtime-integratedsoundpressurelevel LE Correction of background noise K1 and environment K2 on all microphone positions on the measuring surface or continuous measurement path of the microphone The average value (energy average) of the sound pressure level after the surface single event time. Note. Surface single event time integral sound pressure level is expressed in decibels (dB). 3.20 Sound power soundpower The sound power is the product of the sound pressure p at a point on the measuring surface and the normal component of the measuring surface velocity of the point particle velocity on the entire measuring surface. integral. [ISO 80000-8.2007 [21], 8-16] Note 1. The unit of sound power is watts (W). Note 2. This value is related to the acoustic energy of the air emitted by the sound source unit time. 3.21 Sound power level soundpowerlevel LW The ratio of the sou......
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