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JJF 1883-2020: Calibration Specification for Standard Sample in Impedance Tube Absorption
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JJF 1883-2020English369 Add to Cart 3 days [Need to translate] Calibration Specification for Standard Sample in Impedance Tube Absorption

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Basic data

Standard ID JJF 1883-2020 (JJF1883-2020)
Description (Translated English) Calibration Specification for Standard Sample in Impedance Tube Absorption
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Word Count Estimation 16,117
Date of Issue 2020-11-26
Date of Implementation 2021-05-26
Regulation (derived from) Announcement No. 57 (2020) of the State Administration for Market Regulation
Issuing agency(ies) State Administration for Market Regulation

JJF 1883-2020: Calibration Specification for Standard Sample in Impedance Tube Absorption


---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.
Calibration Specification for Standard Sample in Impedance Tube Absorption National Metrology Technical Specifications of the People's Republic of China Calibration specification for impedance tube sound absorption standard sample 2020-11-26 release 2021-05-26 implementation Issued by the State Administration for Market Regulation Calibration specification for impedance tube sound absorption standard sample Focal point: National Technical Committee of Acoustics Measurement Drafting unit: Hubei Institute of Metrology and Testing Technology 701 Research Institute of China Shipbuilding Industry Corporation China Institute of Metrology This specification entrusts the National Acoustics Metrology Technical Committee to be responsible for interpretation Drafters of this specification: Yao Qiuping (Hubei Institute of Metrology and Testing Technology) Zhu Chuanhuan (701 Research Institute of China Shipbuilding Industry Corporation) Niu Feng (China Institute of Metrology) Wang Fei (Hubei Institute of Metrology and Testing Technology) Shi Qiuhua (Hubei Institute of Metrology and Testing Technology) Zhang Hengping (701 Research Institute of China Shipbuilding Industry Corporation)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 3:1 Normal incident sound absorption coefficient (1) 3:2 Datum plane (1) 3:3 Standing wave diagram (1) 3:4 Standing wave ratio (1) 3:5 Transfer function (2) 4 Overview (2) 5 Measurement characteristics (2) 5:1 Sound absorption coefficient (2) 5:2 Stability (2) 6 Calibration conditions (2) 6:1 Environmental conditions (2) 6:2 Standards and other equipment (2) 7 Calibration items and calibration methods (3) 7:1 Calibration items (3) 7:2 Calibration method (3) 8 Calibration result expression (5) 8:1 Calibration data processing (5) 8:2 Calibration certificate (5) 8:3 Measurement uncertainty of calibration results (6) 9 Recalibration interval (6) Appendix A The format of the inner page of the calibration certificate of impedance tube standard sample (7) Appendix B Examples of Uncertainty Evaluation of Sound Absorption Coefficient Calibration Results (8)

Introduction

This specification is based on the rules and format given in JJF 1071-2010 "Rules for Compiling National Metrology and Calibration Specifications" prepared by: This specification refers to GB/T 18696:1-2004 "Sound absorption coefficient and acoustic impedance measurement in acoustic impedance tube Part 1: Standing Wave Ratio Method and GB/T 18696:2-2002 "Sound absorption coefficient and acoustic impedance in acoustic impedance tube Measurement Part 2: Transfer Function Method: This specification is released for the first time: Calibration specification for impedance tube sound absorption standard sample

1 Scope

This specification applies to the calibration of impedance tube sound absorption standard samples:

2 Reference documents

This specification refers to the following documents: JJF 1001-2011 General measurement terms and definitions JJF 1034-2005 Acoustic measurement terms and definitions JJF 1059:1-2012 Measurement Uncertainty Evaluation and Expression JJF 1223-2009 Standing Wave Tube Calibration Specification (Standing Wave Ratio Method) JJF 1446-2014 impedance tube calibration specification (transfer function method) GB/T 3102:5-1993 Quantities and units of electricity and magnetism GB/T 3102:7-1993 Acoustic quantities and units GB/T 18696:1-2004 Sound absorption coefficient and acoustic impedance measurement in acoustic impedance tube Part 1: Stationary Bobby Method GB/T 18696:2-2002 Sound absorption coefficient and acoustic impedance measurement in acoustic impedance tube Part 2: Transmission Recursive function method For dated reference documents, only the dated version applies to this specification; for undated references The latest version (including all amendments) is applicable to this specification:

3 Terms and units of measurement

This specification adopts the quantities and units specified in GB/T 3102:5 and GB/T 3102:7: JJF 1001-2011, JJF 1034-2005 and JJF 1059:1-2012 defined and the following terms and definitions are applicable Used in this specification: 3:1 Normal incident sound absorption coefficient normalincidence[sound]absorptioncoefficient The ratio of the sound power of the normal incident plane wave entering the surface of the specimen to the incident sound power: Note: The sound absorption coefficients in this specification are all normal incident sound absorption coefficients: 3:2 Reference plane Cross section of impedance tube used to determine sound pressure reflection factor r or surface acoustic impedance rate Zs or surface acoustic admittance rate Gs, If the surface of the test piece is flat, it is usually taken as the reference plane: 3:3 standingwavepattern The surface of the impedance tube measurement test piece is used as the reference surface, and the distance between the impedance tube probe tube microphone and the reference surface is horizontal: Mark, the output sound pressure of the probe tube microphone is the ordinate, draw the distance sound pressure diagram from the reference surface: [JJF 1223-2009, definition 3:1] 3:4 standing wave ratio standingwaveratio On a standing wave graph without attenuation, the ratio of the amplitude pmax of the maximum sound pressure to the amplitude pmin of the minimum sound pressure: ...

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