Hivatkozási szám

MSZ EN ISO 3744:2026

Dokumentumazonosító

188243

Cím

Akusztika. Zajforrások hangteljesítményszintjének meghatározása hangnyomásméréssel. Műszaki módszerek alapvetően szabad térben, visszaverő sík felett (ISO 3744:2025, tartalmazza a 2026. januári helyesbített változatot)

Angol cím

Acoustics. Determination of sound power levels of noise sources using sound pressure. Engineering methods for an essentially free field over a reflecting plane (ISO 3744:2025, including Corrected version 2026-01)

Alkalmazási terület

1.1 General This document specifies methods for determining the sound power level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. The sound power level produced by the noise source, in frequency bands or with A-weighting applied, is calculated using those measurements. NOTE Differently shaped measurement surfaces can yield differing estimates of the sound power level of a given noise source which are accounted for in the uncertainty associated with this test method. An appropriately drafted noise test code (see ISO 12001) gives detailed information on the selection of the surface. 1.2 Types of noise and noise sources The methods specified in this document are suitable for all types of noise (steady, non-steady, and fluctuating) as defined in ISO 12001, except for short duration, impulsive events. This document is applicable to all types and sizes of noise source (e.g. stationary or slowly moving component or sub-assembly), provided that the conditions for the measurements can be met. NOTE It is possible that the conditions for measurements given in this document are impracticable for very tall or very long sources such as chimneys, ducts, conveyors and multi-source industrial plants. A noise test code for the determination of noise emission of specific sources can provide alternative methods in such cases. 1.3 Test environment The test environments that are applicable for measurements made in accordance with this document can be located indoors or outdoors, with one or more sound-reflecting planes present on or near which the noise source under test is mounted. The ideal environment is a completely open space with no bounding or reflecting surfaces other than the reflecting plane(s), such as that provided by a qualified hemi-anechoic chamber, but procedures are given for applying corrections (within limits that are specified) in the case of environments that are less than ideal. Annex A or ISO 26101-2 specifies methods for determining the adequacy of the test environment and for determination of corrections to be applied to account for the effect of the test environment. 1.4 Measurement uncertainty Information is given on the uncertainty of the sound power levels determined in accordance with this document, for measurements made in limited bands of frequency and with frequency A-weighting applied. Annex I specifies procedures for testing laboratories that can be used to reduce measurement uncertainty. The uncertainty conforms to ISO 12001, accuracy grade 2 (engineering grade). General information on measurement uncertainty is provided in this document and additional information can be found in ISO 5114-1[8].

ICS

17.140.01 Akusztikai mérések és zajcsökkentés általában

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2026-08-01

Forrás

idt EN ISO 3744:2026; idt ISO 3744:2025

Előd

MSZ EN ISO 3744:2011

Utód

Módosítás

Kiegészítő információk

SZK-közlemények

Kapcsolódó európai jogszabály

2006/42/EK AZ EURÓPAI PARLAMENT ÉS A TANÁCS 2006/42/EK IRÁNYELVE (2006. május 17.) a gépekről és a 95/16/EK irányelv módosításáról (átdolgozás) (EGT vonatkozású szöveg) (MAC06)

A szabvány

kapható formátuma

Papír ,
PDF (letöltés) (a fájl mérete: 2235260) ,

oldalszáma

74 oldal; W kategória

ára

Nettó: 25750 Ft
Bruttó:
Papír formátum esetén (25% nyomdai költséggel, 5% Áfával): 33797 Ft
PDF (letöltés) formátum esetén ( 27% Áfával): 32703 Ft