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JJF 1146-2006

JJF 1146-2006_English: PDF (JJF1146-2006)
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JJF 1146-2006English409 Add to Cart 3 days Calibration specification for acoustic characteristcs of anechoic water tanker JJF 1146-2006 Valid JJF 1146-2006

BASIC DATA
Standard ID JJF 1146-2006 (JJF1146-2006)
Description (Translated English) Calibration specification for acoustic characteristcs of anechoic water tanker
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Word Count Estimation 17,192
Date of Issue 2006-05-23
Date of Implementation 2006-08-02
Quoted Standard GB/T 3102.7-1993; GB/T 3223-1994; GB/T 3947-1996; GB/T 14369-1993; JJF 449-2001; JJF 1034-2006
Drafting Organization ?Chinese Academy of Science Institute of Acoustics
Administrative Organization National Technical Committee on Acoustic Measurement
Summary This standard applies to the acoustic characteristics of anechoic water tank, including free-field anechoic pool area, pool interface sound pressure reflection factor and pools to determine the noise floor. Evaluation can also be used as a basis muffler acoustic characteristics pond.

JJF 1146-2006
Calibration specification for acoustic characteristcs of anechoic water tanker
National Metrology Technical Specification of the People's Republic
Acoustic pool acoustic characteristics calibration specification
Released on.2006-05-23
Implementation of.2006-08-23
The General Administration of Quality Supervision, Inspection and Quarantine issued
Acoustic pool acoustic characteristics calibration specification
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on May 23,.2006, and
Implemented on August 23,.2006.
Focal Point. National Acoustic Metrology Technical Committee
Main drafting unit. Institute of Acoustics, Chinese Academy of Sciences
Participated in the drafting unit. China Shipbuilding Industry Corporation Seventh Five-Year Research Institute
China Testing Technology Research Institute
This specification is interpreted by the National Acoustic Metrology Technical Committee.
The main drafters of this specification.
Zhu Houqing (Institute of Acoustics, Chinese Academy of Sciences)
Yuan Wenjun (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation)
Participate in the drafters.
Zhao Han (Seventh Five-Year Research Institute of China Shipbuilding Industry Corporation)
Shang Guohua (China Testing Technology Research Institute)
Cui Zheng (Institute of Acoustics, Chinese Academy of Sciences)
table of Contents
1 range (1)
2 Citations (1)
3 terms and units of measurement (1)
3.1 Echo interference (1)
3.2 Free field area range (1)
3.3 Free field frequency range (1)
3.4 Pool noise floor (1)
4 Overview (1)
5 Measurement characteristics (2)
5.1 Free field area (2)
5.2 Free field frequency range (2)
5.3 Sound pressure reflection factor of pool interface (2)
5.4 Noise floor in the pool (2)
6 Calibration conditions (2)
6.1 Environmental conditions (2)
6.2 Standards and other equipment (3)
7 Calibration items and calibration methods (3)
7.1 Calibration Project (3)
7.2 Calibration method (4)
8 Expression of calibration results (6)
8.1 Processing of calibration results (6)
8.2 Re-study interval (6)
Appendix A Measurement of Echo Interference by Pulse Acoustic Method and Transfer Impedance Method (7)
Appendix B Inner Page Format of Calibration Certificate (9)
Appendix C Uncertainty Evaluation of Calibration Results (11)
Acoustic pool acoustic characteristics calibration specification
1 Scope
This specification applies to the acoustic characteristics of the muffler pool, including the free field area of the muffler pool, and the sound pressure of the pool interface.
Determination of the shot factor and the noise floor of the pool. It can also be used as a basis for evaluating the acoustic characteristics of the muffler pool.
2 Citations
GB/T 3102.7-1993 The amount and unit of acoustics
GB/T 3223-1994 underwater acoustic transducer free field calibration method
GB/T 3947-1996 acoustic terminology
GB/T 14369-1993 Method for measuring insertion loss and echo reduction of underwater acoustic materials
JJF 449-2001 octave and 1/3 octave filter
JJF 1034-2006 Acoustic measurement terminology and definition
Use of this specification should be done with the current valid version of the above cited documents.
3 terms and units of measure
This specification uses the relevant terms and definitions in GB/T 3947-1996 and JJF 1034-2006.
This specification uses the quantities and units specified in GB/T 3102.7-1993.
3.1 Echoic interference value (echoicinterferencevalue)
The ratio of the combined sound pressure amplitude of the direct sound and the reflected sound in the anechoic pool to the direct sound pressure amplitude is multiplied by the common logarithm
20, in dB.
3.2 Free field area range (free[sound]fielddomain)
a sound field with an echo interference of 0 dB or an upswing that does not exceed a certain agreed value in a given frequency range
geographic range.
3.3 Free field frequency range (free[sound]fieldfrequencyrange)
The amount of echo interference at