JJF 1877-2020 English PDF

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JJF 1877-2020: Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube Method)
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1877-2020	509	Add to Cart	4 days	Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube Method)	Valid

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Basic data

Standard ID: JJF 1877-2020 (JJF1877-2020)
Description (Translated English): Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube Method)
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Word Count Estimation: 22,295
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 1877-2020: Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube 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.
Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube Method) National Metrology Technical Specifications of the People's Republic of China Acoustic performance parameter measurement system for underwater acoustic materials (Pulse tube method) Calibration specification (PulseTubeMethod) 2020-11-26 release 2021-05-26 implementation Issued by the State Administration for Market Regulation Acoustic performance parameter measurement system for underwater acoustic materials (Pulse tube method) Calibration specification CalibrationSpecificationforAcoustic PerformanceParametersMeasurement SystemsofUnderwaterAcousticMaterials (PulseTubeMethod) Focal point: National Technical Committee of Acoustics Measurement Main drafting unit: 715 Research Institute of China Shipbuilding Industry Corporation Participated in the drafting unit: Institute of Acoustics, Chinese Academy of Sciences China State Shipbuilding Corporation Ship System Engineering Research Institute This specification entrusts the National Acoustics Metrology Technical Committee to be responsible for interpretation Drafters of this specification: Li Shui (The 715th Research Institute of China Shipbuilding Industry Corporation) Yi Yan (The 715th Research Institute of China Shipbuilding Industry Corporation) Mo Xiping (Institute of Acoustics, Chinese Academy of Sciences) Zhao Han (The 715th Research Institute of China Shipbuilding Industry Corporation) He Yuanan (Ship System Engineering Research Institute of China State Shipbuilding Corporation)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 4 Overview (2) 5 Metering characteristics (3) 5:1 Sound pressure reflection coefficient of standard samples (3) 5:2 Sound pressure transmission coefficient of standard samples (3) 6 Calibration conditions (3) 6:1 Environmental conditions (3) 6:2 Measurement standards and other equipment (4) 7 Calibration items and calibration methods (4) 7:1 Calibration items (4) 7:2 Calibration method (4) 8 Expression of calibration results (6) 8:1 Calibration data processing (6) 8:2 Calibration certificate (6) 8:3 Evaluation of Uncertainty of Calibration Results (6) 9 Recalibration interval (6) Appendix A Contents of Calibration Certificate (7) Appendix B Evaluation Example of Measurement Uncertainty (9) Appendix C Nominal values of performance parameters of standard samples (16)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications" and GB/T 14369-2011 The "Acoustic and Hydroacoustic Material Sample Insertion Loss, Echo Reduction and Sound Absorption Coefficient Measurement Method" was compiled: This specification is released for the first time: Acoustic performance parameter measurement system for underwater acoustic materials (Pulse tube method) Calibration specification

1 Scope

This specification applies to the pulse tube measurement system for the acoustic performance of underwater acoustic materials used in the frequency range of 2kHz to 30kHz: System calibration:

2 Reference documents

This specification refers to the following documents: JJG449-2014 Octave and Fractional Octave Filter JJF 1001 General measurement terms and definitions JJF 1034 Acoustic measurement terms and definitions JJF 1059:1-2012 Measurement Uncertainty Evaluation and Expression GB/T 3102:7 Acoustic quantities and units GB/T 3223-1994 Acoustic Underwater Acoustic Transducer Free Field Calibration Method GB/T 3947 Acoustic terms GB/T 14369-2011 Acoustics: Measurement of insertion loss, echo reduction and sound absorption coefficient of hydroacoustic material samples 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

GB/T 3223-1994, GB/T 3947, GB/T 14369-2011, JJF 1001, JJF 1034 and The following terms and definitions defined by JJG449-2014 apply to this specification: This specification adopts the quantities and units specified in GB/T 3102:7-1993: 3:1 underwateracousticmaterial Passive materials and components with specific acoustic properties used in underwater acoustic engineering: 3:2 Pulse tube pulsetube Water-filled in which pulsed sound waves are emitted, propagated and received, used to measure the acoustic characteristics of materials or component samples Rigid thick-walled metal pipe: [GB/T 14369-2011, definition 3:1] Note: The pulse tube is generally a thick-walled round tube, placed vertically, and the wall thickness is not less than the inner radius of the tube: 3:3 Sound pressure transmission coefficient soundpressuretransmissioncoefficient Under a given frequency and environmental conditions, a plane acoustic wave in a water medium is incident on the surface of an infinite plate sample, and its transmitted wave The ratio of the sound pressure to the sound pressure of the incident wave: ......

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