GB/T 1859.3-2015 English PDF

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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
Status: Valid

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GB/T 1859.3-2015	489	Add to Cart	4 days	Reciprocating internal combustion engines -- Measurement of sound power level using sound pressure -- Part 3: Precision methods for hemi-anechoic rooms	Valid

Similar standards

GB/T 1859.1   GB/T 1859.2   JB/T 11880.2   GB/T 1859.4   GB/T 23337   GB/T 1859.4   

Basic data

Standard ID: GB/T 1859.3-2015 (GB/T1859.3-2015)
Description (Translated English): Reciprocating internal combustion engines -- Measurement of sound power level using sound pressure -- Part 3: Precision methods for hemi-anechoic rooms
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J93
Classification of International Standard: 27.020
Word Count Estimation: 23,259
Date of Issue: 2015-12-10
Date of Implementation: 2016-07-01
Regulation (derived from): National Standard Announcement 2015 No.38
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

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

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Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3. Precision methods for hemi-anechoic rooms ICS 27.020 J93 National Standards of People's Republic of China Reciprocating internal combustion engines measured sound pressure level of sound power Part 3. Precision method semi-anechoic chamber Part 3. Precisionmethodsforhemi-anechoicrooms Issued on. 2015-12-10 2016-07-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 4 acoustic environment 3 4.1 General 3 Guideline 4 4.2 background noise 4.3 Test environment suitable acoustic criterion 4 5 4 measuring instruments 5.1 General 4 5.2 Calibration 4 5.3 4 6 5 Mounting and operating conditions 6.1 General 5 5 6.2 Installation conditions 6.3 Operating Conditions 5 Measuring 5 7 7.1 General 5 7.2 Measurement Uncertainty 6 7.3 baseline body 6 7.4 Measuring distance 6 Surface area measuring 7.5 and 6 7.6 microphone positions 7 7.7 9 microphone positions appropriate guidelines 8 Calculation 10 8.1 General 10 8.2 sound pressure level measured mean standard deviation calculated 10 8.3 Calculation of sound power levels 10 9 record content 11 10 of the report 12 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 15 References 16

Foreword

GB/T 1859 "Reciprocating internal combustion engine sound pressure measured sound power level" is divided into four parts. --- Part 1. Engineering method; --- Part 2. Simple method; --- Part 3. Precision method semi-anechoic chamber; --- Part 4. Use a standard sound source method. This section GB/T 1859 Part 3. This section drafted in accordance with GB/T 1.1-2009 given rules. This part is proposed by China Machinery Industry Federation. This part of the internal combustion engine by the National Standardization Technical Committee (SAC/TC177) centralized. This section was drafted by. Shanghai Internal Combustion Engine Research Institute, Shanghai Automotive Group Co., Ltd. Commercial Vehicle Technical Center, Anhui University, Tongji University, Zhejiang University, Tianjin Institute of the internal combustion engine, Shanghai Automotive Group Co., Ltd. Technical Center. The main drafters of this section. Yuan Weiping, Jiang Xiaomin, Dong Xufeng, Huai Hua, Xiao Yu flow, right Zhang Yuan from remote, Belts, TRANSACTIONS, Yehuai Han, King Yabing, Liu Baohua, Zhou Yuekang.

Introduction

This section GB/T 1859 reciprocating internal combustion engine is one of a series of standards of sound power levels measured sound pressure. The series of standards is given One kind of method to calculate the sound pressure level of sound power levels measured on the measurement surface enveloping the sound source. Installation conditions sound power level measurement results of the test environment and the sound source is substantially independent, which is characterized by various types of machine sound power level and An important reason for equipment noise radiation. Sound power level has the following purposes. --- Under specified conditions radiated noise labeling machine; --- Verify the indicated value of the noise; Comparison of noise --- various types and sizes of machines radiation; --- Comparison with the noise limits specified in the purchase contract or the specification; --- Reduce formulation (generally need to provide the band sound power level) radiated noise machine engineering measures; --- Forecast specify the location of the noise level. Table 1 shows the sound power level measurement method of the present series of standards envelope surface law applies three levels of accuracy, precision measurement results to 0.1dB. The method given in this section allows the determination of A-weighted sound power level and the band sound power level of accuracy grade 1; A-weighted sound power level It can also be calculated from the band sound power level, but it is not exactly the same as by measuring the A-weighted sound pressure level determined sound power level. Table 1 List of national standard sound pressure Determination of sound power levels of reciprocating internal combustion engines parameter GB/T 1859.3 GB/T 1859.1 GB/T 1859.2 GB/T 1859.4 Semi-anechoic chamber method precision engineering method simple method using a reference sound source method Level 1 2 3 3 test environment A reflective surface Free field above A reflective surface Free field above A reflective surface The sound field at the top of A plurality of reflecting surfaces of the sound field The volume of the sound source Preferably less than test Room volume of 0.5% Unlimited; depending on the test environment Guidelines for a background noise ΔLp≥10dB K1≤0.5dB ΔLp≥6dB K1≤1.3dB ΔLp≥3dB K1≤3.0dB Acoustic test environment suitable criteria specific requirements K2≤4dB K2≤7dB special requirements Microphone position Suitable criteria b sL'pm () ≤1/2dB sL'pm () ≤ 2/2dB sL'pm () ≤1dB sL'pm () ≤ 2dB Measuring instruments c Sound Level Meter/filter/sound calibrators Level 1/Level 1/Level 2 Level 1/Level 2/Level 1 A-weighted sound power level or A-weighted frequency band available use Sound power level calibration test; Development of engineering measures Sound power level acceptance tests; Development of engineering measures Sound power level comparison test SPL difference ΔLp background noise and a correction K1 in this section refer to 8.3.2. Mean b of this section deviation sL'pm () See 7.7. c instrument requirements in this section refer to Chapter 5. Table 2 shows the sound power level measurement uncertainty limits (caps with the reproducibility standard deviation expressed). They reflect measurement uncertainty The combined effect of, but does not include the sound power level changes Mounting and operating conditions of the sound source under test and other factors. Noise control in a reciprocating internal combustion engine, stakeholders (including producing, installation and consumer side, etc.) must be of acoustic information Effective communication, the acoustic information obtained by measurement. Only under specified measurement conditions clear acoustic volume, and the use of standards The results of measuring instruments and methods of measurement are valid. Therefore, the selection of these criteria, and the object to be measured based on the noise measurement conditions Make the best choice. Table 2 sound power level measurement uncertainty limits list (limit with the reproducibility standard deviation expressed) in decibels Center frequency/Hz Octave 1/3 octave GB/T 1859.3 Precision methods for semi-anechoic chamber Level 1 GB/T 1859.1 Engineering method level 2 GB/T 1859.2 Simple Method Level 3 GB/T 1859.4 Simple method using a standard sound source Level 3 6350 80 2.0 5.0 125 100 160 1.5 - 3.0 250 200 315 1.5 2.0 500 400 - 630 1.5 1.5 1000 ~ 4000800 ~ 5000 1.0 1.5 80,006,300 to 10,000 1.5 2.5 A weighted 1.0 1.5 3.0 4.0 Reciprocating internal combustion engines measured sound pressure level of sound power Part 3. Precision method semi-anechoic chamber

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 soundpressure Transient and static pressure difference between the pressure in units of Pa (Pa). 3.2 SPL soundpressurelevel Lp 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. ......

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