ISO 6798-3:2022
Reciprocating internal combustion engines — Measurement of sound power level using sound pressure — Part 3: Survey method for use in situ
This document specifies the measurement method of sound power level for reciprocating internal combustion engines, which is a survey method for use in situ.
This document applies to all reciprocating internal combustion engines falling within the field of application of ISO 3046-1 and other internal combustion engines where no suitable International Standard exists.
NOTE In this document, reciprocating internal combustion engines are referred to as engines unless otherwise explained.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Test environment
4.1 General
4.2 Criterion for background noise
5 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 and area
7.6 Microphone positions
7.7 Criterion for the position adequacy of microphones
7.8 Reference sound source
7.8.1 General
7.8.2 Substitution method
7.8.3 Top-up method
7.8.4 Juxtaposition method
8 Calculation
8.1 General
8.2 Calculation of standard deviation of the mean sound pressure level
8.3 Calculation of sound power level
8.3.1 Measured surface time-averaged sound pressure levels
8.3.2 Corrections for background noise
8.3.3 Surface time-averaged sound pressure level
8.3.4 Sound power level
9 Test report
9.1 General
9.2 Information to be recorded
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Test environment
4.1 General
4.2 Criterion for background noise
5 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 and area
7.6 Microphone positions
7.7 Criterion for the position adequacy of microphones
7.8 Reference sound source
7.8.1 General
7.8.2 Substitution method
7.8.3 Top-up method
7.8.4 Juxtaposition method
8 Calculation
8.1 General
8.2 Calculation of standard deviation of the mean sound pressure level
8.3 Calculation of sound power level
8.3.1 Measured surface time-averaged sound pressure levels
8.3.2 Corrections for background noise
8.3.3 Surface time-averaged sound pressure level
8.3.4 Sound power level
9 Test report
9.1 General
9.2 Information to be recorded
Bibliography