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GB/T 1859.3-2015Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3: Precision methods for hemi-anechoic rooms (English PDF)

往复式内燃机声压法声功率级的测定第3部分：半消声室精密法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 10, 2015

Implementation date

July 1, 2016

Scope

GB/T 1859.3-2015 is the English-translated version of 往复式内燃机声压法声功率级的测定第3部分：半消声室精密法.

GB/T 1859.3-2015 is the Chinese standard "Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3: Precision methods for hemi-anechoic rooms".

Its scope clause reads: This section GB/T 1859 specifies the method for measuring the sound pressure reciprocating internal combustion engine of sound power levels of precision --- semi-anechoic chamber method.

This section applies to GB/T 6072.1 defined reciprocating internal combustion (hereinafter unless otherwise indicated, referred to as the engine), and there is no close Other suitable standard internal combustion engines can be used. Its clauses include terms and definitions.

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Document preview — GB/T 1859.3-2015

National Standard of the People's Republic of China

ICS: 27.020
Classification: J 93
Replacing: GB/T 1859-2000

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 acoustic environment
4.1 General
4.3 Test environment suitable acoustic criterion
5 4 measuring instruments
5.1 General
5.2 Calibration
5.3
6 5 Mounting and operating conditions
6.1 General
6.2 Installation conditions
6.3 Operating Conditions
7.1 General
7.2 Measurement Uncertainty
7.3 baseline body
7.4 Measuring distance
7.6 microphone positions
7.7 9 microphone positions appropriate guidelines
8 Calculation
8.1 General
8.2 sound pressure level measured mean standard deviation calculated
8.3 Calculation of sound power levels
9 record content
10 of the report
Appendix A (normative) Calculation A-weighted sound power level 13 from the band sound power level
Appendix B (normative) reference meteorological conditions sound power level
References

1 Scope

This section GB/T 1859 specifies the method for measuring the sound pressure reciprocating internal combustion engine of sound power levels of precision --- semi-anechoic chamber method.

This section applies to GB/T 6072.1 defined reciprocating internal combustion (hereinafter unless otherwise indicated, referred to as the engine), and there is no close

Other suitable standard internal combustion engines can be used.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 3241 electro-acoustics octave and fractional octave filters

GB/T 3785.1 electric acoustic sound level meters - Part 1. Specification

Performance and calibration of GB/T 4129 Acoustics Determination of sound power levels for standard sound source requirements

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 6072.3 reciprocating internal combustion engines - Performance - Part 3. Test measurements

GB/T 15173 electric acoustic sound calibrators

ISO 3745.2012 Determination of sound pressure of sound power levels of noise sources and sound level anechoic and semi-anechoic chamber Precision methods (Acoustics-Determinationofsoundpowerlevelsandsoundenergylevelsofnoisesourcesusing soundpressure-Precisionmethodsforanechoicroomsandhemi-anechoicrooms)

3 Terms and Definitions

GB/T 3241, GB/T 3785.1, GB/T 6072.1 and define the following terms and definitions apply to this document.

3.1 Sound pressure

Transient and static pressure difference between the pressure in units of Pa (Pa).

3.2 SPL soundpressurelevel

Sound pressure p and the square of the reference sound pressure p0 ratio of the square of the logarithm to the base 10 multiplied by 10 decibels (dB). Reference sound pressure p0 is 20µPa.

Lp = 10lg p2 p20 (1)

NOTE. If GB/T 3785.1 predetermined specific frequency weighting and time weighting and/or special band, with an appropriate index, expressed as LpA A-weighted sound

Pressure level.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

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Editions of GB/T 1859.3

Edition	Title	Revision	Status
GB/T 1859.3-2015	Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3: Precision methods for hemi-anechoic rooms	current edition	Current
GB/T 1859-2000	Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3: Precision methods for hemi-anechoic rooms	previous edition	Superseded

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