ISO 5114-1:2024

Name: ISO 5114-1:2024 — Acoustics — Determination of uncertainties associated with sound emission measures — Part 1: Sound power levels determined from sound pressure measurements
SKU: ISO 5114-1:2024
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Acoustics — Determination of uncertainties associated with sound emission measures — Part 1: Sound power levels determined from sound pressure measurements

Название (английский):

ISO 5114-1:2024

Acoustics — Determination of uncertainties associated with sound emission measures — Part 1: Sound power levels determined from sound pressure measurements

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 27
Дата публикации:: 12 июня 2024 г.
Издание:: ISO IS 5114 edition 1 version 1
ICS:: 17.140.01

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Описание (английский):

This document gives guidance on the determination of measurement uncertainties of sound power levels determined according to ISO 3741, ISO 3743-1, ISO 3743-2, ISO 3744, ISO 3745, ISO 3746, ISO 3747 or according to a noise test code based on one of these measurement standards.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 5114-1:2024 - "Acoustics - Determination of uncertainties associated with sound emission measures - Part 1: Sound power levels determined from sound pressure measurements" - provides guidance for estimating measurement uncertainty of sound power levels derived from sound pressure measurements. It applies to measurements performed under ISO test methods such as ISO 3741, ISO 3743-1, ISO 3743-2, ISO 3744, ISO 3745, ISO 3746 and ISO 3747, or noise test codes based on those standards. The document defines a clear concept for reporting uncertainty in decibels, consistent with the ISO/IEC Guide 98-3 approach to uncertainty evaluation.

Key technical topics and requirements

Uncertainty model and terminology: Defines measurement result, measurement uncertainty, expanded uncertainty, coverage factor, repeatability and reproducibility conditions.

Decomposition of total uncertainty: Introduces the total standard deviation σ_tot as the combination of:

σ_R0 - standard deviation of reproducibility of the method (variation across labs, instruments, procedures); and
σ_omc - standard deviation due to operating and mounting conditions (instability of the source under test).
Relationship: σ_tot = sqrt(σ_R0^2 + σ_omc^2).

Expanded uncertainty: Expanded measurement uncertainty UL is calculated as UL = k · σ_tot, where the coverage factor k is chosen according to the desired confidence level (e.g., k = 2 for ~95% two-sided confidence).

Determination methods:

Round robin tests to derive σ_R0 for a machine family or measurement procedure.
Mathematical modelling / detailed uncertainty budgets to derive component contributions.

Practical measurement guidance:

Procedures for repeated measurements to evaluate σ_omc (repeating mounting and operating conditions, background noise correction).
Recommendations for defining representative operating and mounting conditions in noise test codes and test reports.

Annexes: Informative detailed uncertainty budgets for common measurement situations - approximated free-field (direct enveloping), diffuse-field, and use of reference sound sources.

Practical applications and who uses this standard

Acoustical testing laboratories use ISO 5114-1 to quantify and report uncertainties with sound power measurements, ensuring reliable comparison and compliance checks.

Manufacturers and product development teams apply the standard when declaring sound power levels and assessing the effect of mounting or operating variability.

Regulatory bodies and conformity assessors rely on standardized uncertainty reporting to judge compliance with noise limits.

Test code writers and standards developers use its guidance to set representative σ values for specific machinery families and to structure noise test codes.

Acoustical consultants use the uncertainty framework when advising on measurement methods, designing round robin studies, or preparing uncertainty budgets.

Related standards

ISO 3741, ISO 3743‑1, ISO 3743‑2, ISO 3744, ISO 3745, ISO 3746, ISO 3747 (sound power measurement methods)

ISO/IEC Guide 98‑3 (GUM) - uncertainty evaluation

Keywords: ISO 5114-1, acoustics, measurement uncertainty, sound power level, sound pressure measurements, ISO 3744, reproducibility, σ_R0, σ_omc, expanded uncertainty, uncertainty budget, round robin tests.

ISO 5114-1:2024

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Practical applications and who uses this standard

Related standards

Технические детали

BS EN ISO 3741:2010

Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure.…

ISO 3743:1976

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ISO 3745:2012/Amd 1:2017

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SIST EN ISO 3747:2011

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