GB/T 1859.1-2015 English PDF (GBT1859.1-2015)

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GB/T 1859.1-2015: Reciprocating internal combustion engines -- Measurement of sound power level using sound pressure -- Part 1: Engineering method
GB/T 1859.1-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 93
Partially replacing GB/T 1859-2000
Reciprocating internal combustion engines -
Measurement of sound power level using sound
pressure - Part 1. Engineering method
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JULY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 4 
Introduction ... 6 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 9 
4 Acoustic environment ... 12 
4.1 General ... 13 
4.2 Background noise criteria ... 13 
4.3 Acoustic suitability criteria for test environment ... 13 
5 Measuring instruments ... 14 
5.1 General ... 14 
5.2 Calibration ... 14 
5.3 Use ... 15 
6 Installation and working conditions ... 15 
6.1 General ... 15 
6.2 Installation conditions ... 15 
6.3 Working conditions ... 16 
7 Measurement ... 17 
7.1 General ... 17 
7.2 Measurement uncertainty ... 17 
7.3 Reference box ... 18 
7.4 Measurement distance ... 19 
7.5 Measurement surface and area ... 19 
7.6 Microphone position ... 19 
7.7 Suitability criteria for microphone position ... 23 
8 Calculation ... 23 
8.1 General ... 23 
8.2 Calculation of the standard deviation of average sound pressure level measured
... 23 
8.3 Calculation of sound power level ... 24 
9 Recording content ... 26 
10 Report ... 27 
Appendix A (Normative) Methods for appraisal of acoustic environment ... 29 
Appendix B (Normative) Calculation of A-weighted sound power level from band
sound power level ... 33 
Appendix C (Normative) Sound power level of reference meteorological
conditions ... 35 
References ... 37 
Foreword
GB/T 1859 “Reciprocating internal combustion engines - Measurement of
sound power level using sound pressure” is divided into 4 parts.
- Part 1. Engineering method;
- Part 2. Survey method;
- Part 3. Precision methods for hemi-anechoic rooms;
- Part 4. Survey method using a reference sound source.
This Part is Part 1 of GB/T 1859.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces the engineering method in GB/T 1859-2000 “Reciprocating
internal combustion engines - Measurement of emitted airborne noise -
Engineering method and survey method”.
As compared with GB/T 1859-2000, the main technical changes of this Part are
as follows.
- DELETE relevant content of “survey method”;
- ADD the clause of “Terms and definitions”;
- MODIFY the provisions on “Acoustic environment”;
- ADD provisions on “Measuring instruments”;
- MODIFY and ADD the provisions on “Installation and working conditions”;
- MODIFY and ADD the provisions on “Measurement”;
- ADD the provisions on “Calculation”;
- ADD the clause of “Recording content”;
- MODIFY the provisions on “Report”;
- DELETE Appendix A and Appendix B in GB/T 1859-2000;
- ADD Appendix A (Normative) “Methods for appraisal of acoustic
environment”, Appendix B “Calculation of A-weighted sound power level
from band sound power level”, and Appendix C “Sound power level of
Introduction
This Part of GB/T 1859 is one of a series of standards for the measurement of
sound power level of reciprocating internal combustion engines using sound
pressure. This series of standards gives a method for measuring the sound
pressure level on the measurement surface enveloping sound source to
calculate the sound power level.
The measurement result of sound power level is basically irrelevant to the test
environment and the installation conditions of sound source. This is an
important reason for the use of sound power level to characterize the noise
radiation of various types of machines and equipment.
The sound power level has the following uses.
- Marking of machine radiation noise under specified conditions;
- Verification of noise marking values;
- Comparison of radiation noise of machines of various models and
dimensions;
- Comparison with the noise limits specified in the purchase contract or
specification;
- Development of engineering measures to reduce machine radiation noise
(Generally, the band sound power level shall also be provided);
- Prediction of noise sound pressure level at specified position.
Table 1 shows the measurement methods of sound power level of three
accuracy classes to which the envelope surface method of this series of
standards applies. The measurement results are accurate to 0.1 dB. The
methods given in this Part allow the determination of A-weighted sound power
level and band sound power level; the accuracy class is Class 2. A-weighted
sound power level can also be calculated from band sound power level, but it
is not exactly the same as the sound power level determined by measuring A-
weighted sound pressure level.
Reciprocating internal combustion engines -
Measurement of sound power level using sound
pressure - Part 1. Engineering method
1 Scope
This Part of GB/T 1859 specifies the measurement method for sound power
level of reciprocating internal combustion engines - engineering method.
This Part is applicable to reciprocating internal combustion engines (unless
otherwise specified, hereafter known as engines for short) in the scope of
application of GB/T 6072.1, and other internal combustion engines to which no
suitable standards apply.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the versions with the dates indicated are
applicable to this document. For the undated references, the latest version
(including all the amendments) are applicable to this document.
GB/T 3241 Electroacoustics - Octave-band and fractional-octave-band filters
GB/T 3785.1 Electroacoustics - Sound level meters - Part 1. Specifications
GB/T 4129 Acoustics - Requirements for the performance and calibration o
reference sound sources used for determination of sound power levels
GB/T 6072.1 Reciprocating internal combustion engines - Performance -
Part 1. Declarations of power, fuel and lubricating oil consumptions and test
methods - Additional requirements for engines for general use
GB/T 6072.3 Reciprocating internal combustion engines - Performance -
Part 3. Test measurements
GB/T 15173 Electroacoustics - Sound calibrators
3 Terms and definitions
3.5 Measurement time interval; T
One or more operating period or operating cycle of the sound source being
measured used to determine the time-averaged sound pressure level, in
seconds (s).
3.6 Acoustic free field
An acoustic field where edge effect is negligible in homogeneous, isotropic
media.
Note. The actual acoustic free field is an acoustic field where the reflection of edge or other
objects within the frequency range of interest is negligible.
3.7 Reflecting plane
A flat surface for sound reflection on which the sound source being measured
is located.
3.8 Acoustic free field over a reflecting plane
The acoustic free field in the half space over an infinitely large reflecting plane,
without any other obstacles.
3.9 Frequency range of interest
The frequency range covered by the octave-band with a center frequency of 63
Hz~8000 Hz (1/3 octave-band of 50 Hz~10000 Hz).
3.10 Reference box
The small...