GB/T 25371-2010 English PDFUS$329.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25371-2010: Foundry machinery -- Measurement method of sound pressure level Status: Valid
Basic dataStandard ID: GB/T 25371-2010 (GB/T25371-2010)Description (Translated English): Foundry machinery -- Measurement method of sound pressure level Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J61 Classification of International Standard: 25.120.30 Word Count Estimation: 14,165 Date of Issue: 2010-11-10 Date of Implementation: 2011-03-01 Quoted Standard: GB 3102.7; GB/T 3241; GB/T 3785-1983; GB/T 3947; JJG 176; JJG 188 Regulation (derived from): National Standard Approval Announcement 2010 No.8 (Total No.163) 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 the standard radiation steady my voice, A sound level measurement method unsteady voice sound radiation and radiation cyclical changes in my voice casting machinery. SPL is also determined by the method of the band. This standard applies to all types of casting voice sound measuring machines. GB/T 25371-2010: Foundry machinery -- Measurement method of sound pressure level---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.Foundry machinery. Measurement method of sound pressure level ICS 25.120.30 J61 National Standards of People's Republic of China Casting machinery noise level measurement method Issued on. 2010-11-10 2011-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordAppendix A of this standard is a normative appendix, Appendix B, Appendix C are informative appendices. The standard proposed by China Machinery Industry Federation. This standard by the National Foundry Machinery Standardization Technical Committee (SAC/TC186) centralized. This standard was drafted. Jinan Foundry and Metalforming Machinery Research Institute Co., Ltd., Jinan Foundry and Metalforming Machinery Research Institute, Qingdao casting machinery set Group Company, Qingdao Green Environmental Protection Equipment Co., Ltd., Qingdao Zhongzhida Environmental Protection Equipment Co., smelting, Qingdao Double Star Foundry Machinery Co., Ltd. The main drafters of this standard. Wang Zhi, Lu Jun, SUN Gui-ping, Wu Zhengtao, benevolence first, gold segment very, Dingren phase. Casting machinery noise level measurement method1 ScopeThis standard specifies the standard radiation stationary noise, A sound level bolometer non-stationary noise and radiated noise periodically varying casting machine Setting Method. Band sound pressure level can also be measured by this method. This standard applies to all types of noise measurement foundry machinery.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB 3102.7 Quantities and units of acoustics GB/T 3241 octave and fractional octave filters GB/T 3785-1983 electric sound level meter, acoustic performance and test methods GB/T 3947 Acoustics Terminology JJG176 acoustic calibrator verification procedures JJG188 sound level meter verification procedures 3 acoustic terms, quantities and units Acoustic terminology used in this standard, designation of quantities and units shall comply with GB/T 3947 and GB 3102.7 of.4 measurement item4.1 Determination of standard project A level or equivalent continuous A sound level. 4.2 as needed to select one or several measuring points measured 63,125,250,500,1000,2000,4000 eight and 8000Hz octave band SPL, the measuring point is generally considered meaningful analysis of the noise source measuring point. Environmental testing and correction value 5 5.1 Test environment requirements and environmental correction 5.1.1 meet the requirements of this standard to have a reflective surface (surface) of the following environments. Outdoor flat a) with a hard reflective surface of open space; A variety of large room, workshop or laboratory b) comply with the provisions of 5.1.2 S/Sv≤0.03 (Environmental correction value K2≤2.0dB) conditions. 5.1.2 When the indoor measurement, taking into account the impact of reflected sound test environment, the environment correction value subtracted from the measurement results K2, K2, According to formula (1) to determine. K2 = 10lg (1 20S/Sv) (1) Where. The K2 --- environmental correction value decibels [dB (A)]; S --- terminated at the reflecting surface of the total area of \u200b\u200bthe side surface and a top surface of a parallelepiped, each face of the parallelepiped (bottom Except face) measured from the casting machine as close as 1m (see Figure 1), in square meters (m2); The total surface area Sv --- test room (ceiling, walls and floor), in square meters (m2). K2 also be graph 2 Richard. ...... |
