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GB/T 4759-2009: Exhaust silencers for internal combustion engines -- Measurement procedure
Status: Valid GB/T 4759: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4759-2009 | English | 229 |
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3 days [Need to translate]
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Exhaust silencers for internal combustion engines -- Measurement procedure
| Valid |
GB/T 4759-2009
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| GB/T 4759-1995 | English | 279 |
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3 days [Need to translate]
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Measurement procedure for exhaust silencers of internal combustion engines
| Obsolete |
GB/T 4759-1995
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| GB 4759-1984 | English | 199 |
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2 days [Need to translate]
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Measurement procedure for exhaust silencers of internal combustion engines
| Obsolete |
GB 4759-1984
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PDF similar to GB/T 4759-2009
Basic data | Standard ID | GB/T 4759-2009 (GB/T4759-2009) | | Description (Translated English) | Exhaust silencers for internal combustion engines -- Measurement procedure | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J93 | | Classification of International Standard | 27.020 | | Word Count Estimation | 10,134 | | Date of Issue | 2009-03-19 | | Date of Implementation | 2009-11-01 | | Older Standard (superseded by this standard) | GB/T 4759-1995 | | Regulation (derived from) | National Standard Approval Announcement 2009 No.3 (Total No.143) | | Issuing agency(ies) |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 method for measuring the internal combustion engine exhaust muffler (hereinafter referred to as silencers) acoustic performance and pneumatic (gas dynamics) properties. Also gives the measurement instrument, measurement conditions and the measurement location requirements. And the calculation of the surface of the exhaust noise sound pressure level and sound power level. This method can be used in standard engineering acceptance tests. This standard is designed to get two acoustic measurement accuracy class (engineering method) measurements. Such as when the background noise correction value is greater than 1. 3 dB but less than or equal to 3 dB, and/or environmental conditions can not meet the requirements of the standard engineering methods, you get three accuracy classes (simple method) measurements. This standard applies to GB/T 6072. 1 range of, small power engine muffler tests. Other uses muffler no suitable national standards may be used (including the intake silencer) may also refer to the use. | GB/T 4759-2009: Exhaust silencers for internal combustion engines -- Measurement procedure---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.
Exhaust silencers for internal combustion engines.Measurement procedure
ICS 27.020
J93
National Standards of People's Republic of China
Replacing GB/T 4759-1995
Engine exhaust muffler Measurement
Posted 2009-03-19
2009-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is GB/T 4759-1995 "engine exhaust muffler measurement methods" amendments.
This standard and GB/T 4759-1995 The main difference is.
--- Modify the scope;
--- Modify the terms and definitions;
--- Increased acoustic measurement 90 ° direction;
--- Exhaust noise increases the surface sound pressure level and sound power level is calculated;
--- Increasing the exhaust back pressure measurement;
--- Modify the test report.
Since the implementation of this standard, instead of the GB/T 4759-1995.
Appendix A of this standard is an informative annex.
The standard proposed by China Machinery Industry Federation.
The standard internal combustion engine by the National Standardization Technical Committee (SAC/TC177) centralized.
This standard was drafted. Shanghai Internal Combustion Engine Research Institute, Shanghai Automotive Group Co., Ltd. Technical Center.
The main drafters of this standard. Yuan Weiping, Pengmei Jun, Cai phase Confucianism, Yehuai Han, Chen Weifang.
This standard replaces the standards previously issued as follows.
--- GB 4759-1984, GB/T 4759-1995.
Engine exhaust muffler Measurement
1 Scope
This standard specifies the measurement side engine exhaust muffler (hereinafter referred to as the muffler) acoustic and aerodynamic performance (gas dynamics) properties
law. Also given on measuring instruments, measurement conditions and measurement requirements of the position, and exhaust noise surface sound pressure level and sound power level is calculated
method. The standard engineering methods can be used for acceptance testing.
The standard acoustic measurements aimed at obtaining Grade 2 accuracy rating (engineering method) measurements. Such as background noise correction value is greater than 1.3dB
But less than or equal to 3dB, and/or environmental conditions can not meet the requirements of this standard engineering methods, the level of accuracy obtained Level 3 (simple method)
Measurement results.
This standard applies to GB/T 6072.1 Scope of medium and small power internal combustion engine muffler trials, there is no appropriate national standards can
Muffler used for other purposes (including intake silencer) may also refer to use.
2 Normative references
The 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/T 3241 octave and fractional octave filters (GB/T 3241-1998, eqv IEC 61260.1995)
GB/T 3785-1983 electric sound level meter, acoustic performance and test methods
GB/T 3947 Acoustics Terminology
GB/T 6072.1 reciprocating internal combustion engine performance - Part 1. Power, calibration and test methods of fuel consumption and lubricating oil consumption
Additional requirements for engines for general use (GB/T 6072.1-2008, ISO 3046-1.2002, IDT)
GB/T 6072.3 reciprocating internal combustion engine performance - Part 3. Test measurements (GB/T 6072.3-2008, ISO 3046-3.
2006, IDT)
JJG176 acoustic calibrator verification procedures
3 Terms and Definitions
GB/T 3947 and established the following terms and definitions apply to this standard.
3.1
Has a sound-absorbing lining or special form structure can effectively reduce the airflow duct noise.
Note. The engine exhaust muffler generally include the entire muffler assembly from the air inlet muffler beginning, excluding the internal combustion engine exhaust manifold and exhaust pipe.
3.2
Front and rear muffler device, a sound source of sound power levels of radiated noise difference outwardly through the exhaust port. Symbol. D; Unit. dB.
When the exhaust pipe outlet location, size, shape and sound field distribution remains unchanged, then the insertion loss is equal to the given measurement point means muffler
The difference between before and after excitation radiation sound pressure level noise outside through the exhaust port.
3.3
Condition before and after the calibration of the internal combustion engine, the muffler device with a power ratio of the difference between the power value when no silencer installed, with a percentage
Shown. Symbol. γ.
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