ChinaAutoRegs|GB/T 1859.4-2025英文版翻译 往复式内燃机 声压法声功率级的测定 第4部分:现场测量简易法

Reciprocating Internal Combustion Engines—Measurement of Sound Power Level Using Sound Pressure—Part 4: Survey Method for Use in Situ

CONTENTS

Foreword

Introduction

1 Scope

2 Normative References

3 Terms, Definitions and Symbols

3.1 Terms and definitions

3.2 Symbols

4 Acoustic Environment

4.1 General

4.2 Criterion for background noise

5 Measuring Instrumentation

5.1 General

5.2 Calibration

5.3 Application

6 Operation Conditions

6.1 Engine conditions

6.2 Operating conditions

7 Measurement

7.1 General

7.2 Measurement uncertainty

7.3 Reference box

7.4 Measurement distance

7.5 Measurement surface

7.6 Microphone positions

7.7 Criterion for the position adequacy of microphones

7.8 Reference sound source (RSS)

8 Calculation

8.1 General

8.2 Calculation of standard deviation of the mean sound pressure level

8.3 Calculation of sound power level

9 Test Report

9.1 General

9.2 Information to be recorded

Bibliography

1 SCOPE

This document specifies the measurement method of sound power level for reciprocating internal combustion engines – survey method for use in situ.

This document applies to the reciprocating internal combustion engines falling within the field of application of ISO 3046-1 and other internal combustion engines where no suitable standard exists.

Note: In this document, reciprocating internal combustion engines are referred to as “engines” unless otherwise explained.

2 NORMATIVE REFERENCES

The following normative documents contain provisions which, through normative reference in this text, constitute essential provision of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment) applies.

ISO 3046-1, 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

Note: GB/T 6072.1-2008, 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 (ISO3046-1:2002, IDT)

ISO 6798-1, Reciprocating internal combustion engines — Measurement of sound power level using sound pressure — Part 1: Engineering method

ISO 6926, Acoustics — Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels

Note: GB/T 4129-2003, Acoustics — Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (ISO 6926:1999, IDT)

IEC 60942, Electroacoustics — Sound calibrators

Note: GB/T 15173-2010, Electroacoustics – Sound calibrators (IEC 60942:2003, IDT)

IEC 61260-1, Electroacoustics — Octave-band and fractional-octave-band filters — Part 1: Specifications

IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications

Note: GB/T 3785.1-2023, Electroacoustics—Sound level meters—Part 1: Specifications (IEC 61672-1:2013, IDT)

3 TERMS, DEFINITIONS AND SYMBOLS

For the purposes of this document, the terms and definitions given in ISO 3046-1, ISO 6798-1, IEC 61260-1, IEC 61672-1 and the following apply.

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