GB/T 17697-2014 English PDFUS$1314.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 17697-2014: Acoustics -- Determination of sound power radiated into a duct by fans -- In-duct method Status: Valid GB/T 17697: Historical versions
Basic dataStandard ID: GB/T 17697-2014 (GB/T17697-2014)Description (Translated English): Acoustics -- Determination of sound power radiated into a duct by fans -- In-duct method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A59 Classification of International Standard: 17.140 Word Count Estimation: 66,680 Date of Issue: 9/3/2014 Date of Implementation: 2/1/2015 Older Standard (superseded by this standard): GB/T 17697-1999 Quoted Standard: GB/T 1236-2000; GB/T 3785.1-2010; GB/T 15173-2010; ISO 266; IEC 61260 Adopted Standard: ISO 5136-2003, IDT Regulation (derived from): People's Republic of China Announcement of Newly Approved National Standards No. 21 of 2014 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 Summary: This Standard specifies a measurement of the connection pipe ventilation fans and other equipment into the outlet end of sound power radiated into the pipe with a silencer at the end of the method. This method is applicable to an air temperature of -50��C GB/T 17697-2014: Acoustics -- Determination of sound power radiated into a duct by fans -- In-duct 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. Acoustics - Determination of sound power radiated into a duct by fans - In-duct method ICS 17.140 A59 National Standards of People's Republic of China Replacing GB/T 17697-1999 Fans and other ventilation equipment acoustic radiation into Determination of sound power conduit pipe method (ISO 5136.2003, IDT) Issued on. 2014-09-03 2015-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Table of ContentsIntroduction Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 Uncertainty of the test method 4 5 5 Test equipment and instruments 7 6 Test arrangement 16 7 Test Method 17 8 Calculation 19 9 record content 19 Content report 10 20 Appendix A (normative) the average velocity and modal comprehensive correction value determined C3,4 21 Determination of Appendix B (normative) Test duct acoustic pressure pulsation and turbulence SNR 27 Calculation Method A-weighted sound power level Annex C (normative) calculated from the 1/3 octave band sound power level 30 Annex D (informative) to C3,4 value of a given flow rate and pipe diameter Calculation example when 31 Annex E (informative) silencer end design and production guidelines 33 Annex F (informative) Evaluation of performance muffler end 42 Annex G (informative) data sampling tube 44 Test Methods Appendix H (informative) small fan connection pipe 48 Test Methods Annex I (informative) large fan connection pipe 52 Appendix J (informative) Measurement vortex component 58 References 59ForewordThis standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB/T 17697-1999 "Acoustics fan sound power radiated into a duct pipe measuring method." This standard compared with GB/T 17697-1999, the main technical changes are as follows. --- Expanding the scope of application, including the connecting pipes of the air handler, the connection pipe cleaners, air conditioners and even connecting pipes Then hot air duct; --- Extend the frequency range of uncertainty; --- Extend the sampling tube allows maximum mean flow velocity, increasing the flow rate of the sampling tube - modal comprehensive correction value; --- Increase the technical content of the nose cone and foam balls wind shield; --- End of the pipe to increase the maximum permissible sound pressure reflection coefficient; --- Technical terms and in accordance with GB/T 3947-1996 "Acoustic Terminology" is defined. This standard uses the translation method identical with ISO 5136.2003 "Acoustics fans and other ventilation devices radiated into a duct sound power Determination duct method. " Correspondence between the consistency of the standards of international documents and normative references of the following documents. --- GB/T 3240-1982 acoustical measurement commonly used frequency (neqISO 266. 1975); --- GB/T 3241-2010 electro-acoustics octave and fractional octave filters (IEC 61260.1995, MOD). This standard was proposed by the Chinese Academy of Sciences. This standard by the National Standardization Technical Committee of Acoustics (SAC/TC17) centralized. This standard is drafted by. Institute of Acoustics, Shenzhen Ya Electrical and Mechanical Industry Co., Ltd., Beijing Labor Protection Science Institute, Hefei University, Tongji University, Nanjing University, Long Shaao Bang Industrial Co., Ltd. of environmental protection. The main drafters of this standard. Chengming Kun, Lvya Dong, Tian Jing, Fang Qingchuan, Zhang Bin, Ren Wentang, Lee Hyo wide, Mao Dongxing, Wu Yu Zhou, Li Zhiyuan, Qiu Xiaojun, Mo Jian Yan, Xu Xin, Diao Yin. This standard replaces the standards previously issued as follows. --- GB/T 17697-1999.IntroductionAppendix A lists the various parameters to determine flow rate and modal comprehensive correction value. Appendix B provides for two measuring sound with turbulence SNR Methods. Appendix C shows the ways that one-third octave band sound level to calculate the A-weighted sound power level. Appendix D gives a level And average velocity calculation example modal comprehensive correction value. Fans and other sound power radiated into a duct ventilation equipment depends in part on the type of pipe acoustic impedance characterization. because This, for a measure to be made clear that the test pipe. The standard test pipe has a circular cross section and muffler end. Appendix E gives details of typical muffler tip. Since the end of the impedance muffler constructed reality is found in high impedance and low impedance Between the intermediate value, so these special conditions resulting sound power is the practical application of the representative value. Theoretically, according to the ventilation equipment Impedance data and estimate the actual pipeline application radiated sound power. Because this information is currently not complete, so the calculation of them in acoustics Usually do not consider the impact of impedance. In order to suppress the turbulent pressure pulsation at the microphone, preferably with a long cylindrical hood (sampling tube). The sampling tube with a microphone Mounted in radial position, so that, even in the plane wave can be calculated based on the high order acoustic modes test sound frequency range determined by the formula Relationship pressure level and sound power level. If in many different laboratories repeated measurements, the measurement uncertainty according to the expected standard deviation is given (see Chapter 4). This standard does not detail the provisions measuring conditions (performance measurement) method can refer to the provisions of GB/T 1236 Industrial and conditions. This standard is one of the ventilation fans and other equipment series of sound power level measurement method. Usually in the absence of connecting pipes, since the fan inlet and exit plane capable of reflecting sound, fan inlet and outlet into the free-field radiation and radiation into the Sound power conduit is different. This standard specifies the law applicable to the fan duct inlet and outlet sound power radiated into a duct measurement. Fan Jin, Export radiated into free-field sound power should reverberation chamber method (GB/T 6881 series), the free field method (GB/T 3767, GB/T 6882, GB/T 3768) or acoustic intensity method (GB/T 16404 series) was measured. Fans and other ventilation equipment acoustic radiation into Determination of sound power conduit pipe method1 Scope1.1 Overview This standard specifies a measurement of the connection pipe ventilation fans and other equipment into the outlet end of the pipe has radiated into the end of the muffler Sound power approach. Note. For simplicity. Hereinafter called "fan" means "fans and other ventilation equipment." This method is applicable to an air temperature of -50 ℃ ~ 70 ℃ and steady radiation wide, narrow and discrete frequency noise of the fan. Test Tube Channel diameter of 0.15m ~ 2m. Appendix H and Appendix I describe the diameter d < 0.15m and d> 2m closed beta testing of the pipeline Set the fan sound power approach. Determination of the standard microphone head position of the maximum average stream velocity limit depends on the type of microphone shield. --- Foam balls hood. 15m/s; --- Nose cone. 20m/s; --- Sampling tube. 40m/s. If these values \u200b\u200bare exceeded, by the above-mentioned microphone guards were insufficient to contain turbulent pressure pulsations (see 3.9). Sound power testing method to measure flow parameters according to GB/T 1236 regulations. Therefore, the test pipe usually fan outlet end Equipped with a "star" rectification gate of the eddy current minimum (see 5.2.9 and 7.3). According to GB/T 1236C type large fan installed, eliminating the need rectification The gate, but only vortex angle not exceeding 15 ° conditions (Appendix J illustrates the determination of the vortex angle). Note. GB/T 1236 provisions of the wind turbine installation types are. only the outlet end of the pipe is connected to (B type), only the inlet end of the pipe is connected (C type) and both ends of the pipe Connected (D type). 1.2 Application of the sound source type This standard describes test methods are applicable to a combination of the fan with at least one end of the pipe is connected to the sound source, as well as other fan/muffler or Called "black box" of the fan assembly. Fans and other equipment covered by this standard include. --- Centrifugal fan connection pipe; --- Connecting duct axial fan; --- Connecting pipe Francis fan; --- Connecting duct air handlers; --- Suction device connection pipe; --- Air conditioner connected to the pipeline; --- Connecting piping hot air. This standard also applies to auxiliary fan steady stream transmission, and testing the sound pressure inside the pipe and the turbulent pressure fluctuation signal to noise ratio of not less than 6dB (see 7.2.1) of other pneumatic sound sources, such as the plenum, dampers and throttle device. GB/T 25516 specifies the determination of such aerodynamic sound source stream another method of reproducing sound power level (reverberation chamber method), it does not require Be under the environment with an airflow measuring sound pressure. This method is for the determination of the original muffler pipe connections of flow noise level design of. Determination of sound power is adjustable by the reverberation room test tube and pipe connected performed. When the fan is installed close to the muffler, the lack of pipeline SNR Determination of sound pressure and turbulent pressure pulsation, so the fan/silencer ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 17697-2014_English be delivered?Answer: Upon your order, we will start to translate GB/T 17697-2014_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 17697-2014_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 17697-2014_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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