EN ISO 4871:1996
(Main)Acoustics - Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996)
Acoustics - Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996)
This International Standard - gives information on the declaration of noise emission values, - describes acoustical and product information to be presented in technical documents for the purposes of noise emission declaration, and - specifies a method for verifying the noise emission declaration. It is applicable to machinery and equipment. The values to be used for the purposes of noise emission declaration are either declared single-number noise emission values, Ld, or declared dual-number noise emission values, L and K. L is a noise emission value determined directly from measurements and K is the uncertainty associated with those measurements. Ld is the sum of L and K represents an upper limit which values from repeated measurements are unlikely to exceed at a given confidence level ; Ld corresponds to the stated or labelled value, Lc, defined in ISO 7574-1. The two forms of noise declaration are alternative means of representing any or all of the A-weighted sound power level, LWA, the A-weighted emission sound pressure level at specified positions, LpA, and the C-weighted peak emission sound pressure level at specified positions,LpC,peak. The choice as to which of the two forms is used in a particular case depends upon the requirements to be fulfilled. This selection is made, and guidance on the values of K is given, in the appropriate noise test code.
Akustik - Angabe und Nachprüfung von Geräuschemissionswerten von Maschinen und Geräten (ISO 4871:1996)
Diese Internationale Norm: - gibt Hinweise zur Angabe von Geräuschemissionswerten; - beschreibt die akustischen Angaben und Produktinformationen, die in technischen Unterlagen für die Zwecke der Geräuschemissionsangabe enthalten sein müssen, und - legt ein Verfahren für die Nachprüfung der Geräuschemissionsangabe fest. Sie ist für Maschinen und Geräte anwendbar.
Acoustique - Déclaration et vérification des valeurs d'émission sonore des machines et équipement (ISO 4871:1996)
Akustika - Deklariranje in preverjanje podatkov o emisiji hrupa naprav in opreme (ISO 4871:1996)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustika - Deklariranje in preverjanje podatkov o emisiji hrupa naprav in opreme (ISO 4871:1996)Akustik - Angabe und Nachprüfung von Geräuschemissionswerten von Maschinen und Geräten (ISO 4871:1996)Acoustique - Déclaration et vérification des valeurs d'émission sonore des machines et équipement (ISO 4871:1996)Acoustics - Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996)21.020Characteristics and design of machines, apparatus, equipment17.140.20Emisija hrupa naprav in opremeNoise emitted by machines and equipmentICS:Ta slovenski standard je istoveten z:EN ISO 4871:1996SIST EN ISO 4871:1997en01-april-1997SIST EN ISO 4871:1997SLOVENSKI
STANDARD
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
SIST EN ISO 4871:1997
INTERNATIONAL STANDARD IS0 4871 Second edition 1996-12-15 Acoustics - Declaration and verification of noise emission values of machinery and equipment Acoustique - Dklaration et vkfica bon des valeurs d’bmission sonore des machines et gquipements Reference number IS0 4871:1996(E) SIST EN ISO 4871:1997
Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 4871 was prepared by Technical Committee lSO/TC 43, Acoustics, Subcommittee SC 1, Noise. This second edition cancels and replaces the first edition (IS0 4871 :I 984), which has been technically revised. Annexes only. A, B, C and D of this International Standard are for information 0 IS0 1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland SIST EN ISO 4871:1997
0 IS0 IS0 4871:1996(E) Introduction Information on the acoustic noise emitted by machinery and equipment is needed by users, planners, manufacturers and authorities. This infor- mation is required for comparing the noise emitted by different products, for assessing noise emissions against noise limits, for planning workplace noise levels, as well as for checking noise reduction achievements, and may be used for estimating requirements for workplace noise immission. In order for machinery noise emission data to be useful, uniform methods of measurement and declaration are necessary to achieve the following purposes. a) b) d d Measurement of noise emission The IS0 3740 series specifies methods for determining the sound power levels of noise sources from sound pressure level measure- ments; the IS0 9614 series specifies methods for determining the sound power levels from sound intensity level measurements; the IS0 11200 series describes methods for determining emission sound pressure levels at specified positions in the vicinity of machinery and equipment. Many other standards give test codes for the measure- ment of the noise emissions of individual types of machinery which are based on these methods. Determination of the noise emission value to be declared The IS0 7574 series gives methods for determining declared noise emission values which are based primarily on the sound power levels of noise sources. For a complete presentation of declared noise emission values, it is necessary to state the sound pressure levels at specified positions as well as the sound power level. Because of the possible confusion in terminology with respect to sound pressure lev- els used to define noise immission, the term “emission sound press- ure level” is used in this International Standard. Presentation of declared noise emission values It is of prime importance to declare sound power levels. It is recog- nized, however, that information on emission sound pressure levels is sometimes required. It is recommended, therefore, that both kinds of quantity be declared, unless otherwise specified. Noise emission declarations can take the form of either a single-number or dual- number presentation; the choice is made in the noise test code ap- propriate to the particular family. Verification of declared noise emission values The IS0 7574 series gives procedures for the verification of a declared noise emission value. In that International Standard, the procedures are applied to verification of declared sound power levels. The pro- cedures of this International Standard are applied to the verification of SIST EN ISO 4871:1997
IS0 4871:1996(E) @J IS0 both sound power levels and emission sound pressure levels. The information in this International Standard on the verification of declared noise emission values may be used both by a buyer of equipment to compare the relative noise levels of various products, and by a manu- facturer as part of a statistical quality control programme. Requirements on the declaration of noise emission values are given in clause 4. As the declaration of noise emission of machinery and equipment is the responsibility solely of the manufacturer or supplier, guidelines concerning the declaration are found in annex A. Requirements on the presentation of declared noise emission values are given in clause 5 and annex B, and those on verification are given in clause 6 and annex C. SIST EN ISO 4871:1997
INTERNATIONAL STANDARD 0 ISO IS0 4871:1996(E) Acoustics - Declaration and verification of noise emission values of machinery and equipment 1 Scope This International Standard - gives information on the declaration of noise emission values, - describes acoustical and product information to be presented in technical documents for the pur- poses of noise emission declaration, and - specifies a method for verifying the noise emission declaration. It is applicable to machinery and equipment. The values to be used for the purposes of noise emission declaration are either declared single- number noise emission values, L,, or declared dual- number noise emission values, L and K. L is a noise emission value determined directly from measure- ments and K is the uncertainty associated with those measurements. Ld is the sum of L and K and rep- resents an upper limit which values from repeated measurements are unlikely to exceed at a given con- fidence level; Ld corresponds to the stated or labelled value, Lc, defined in IS0 7574-l. The two forms of noise declaration are alternative means of representing any or all of the A-weighted sound power level, &*, the A-weighted emission sound pressure level at specified positions, LpA, and the C-weighted peak emission sound pressure level at specified positions, Lpc peak. The choice as to which of the two forms is used’in a particular case depends upon the requirements to be fulfilled. This selection is made, and guidance on the values of K is given, in the appropriate noise test code. Guidelines for determining declared noise emission values are given in annex A. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 3740:1980, Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic standards and for the preparation of noise test codes. IS0 3741: ---I), Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms. IS0 3743-l :I 994, Acoustics - Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms. IS0 3743-2:1994, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms. 1) To be published. (Revision of IS0 3741:1988 and IS0 3742:1988) SIST EN ISO 4871:1997
IS0 4871:1996(E) 0 IS0 IS0 3744: 1994, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane. IS0 3745: 1977, Acoustics - Determination of sound power levels of noise sources - Precision methods for anechoic and semi-anechoic rooms. IS0 3746: 1995, Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane. IS0 3747: 1987, Acoustics - Determination of sound power levels of noise sources - Survey method us- ing a reference sound source. IS0 7574-l : 1985, Acoustics - Statistical methods for determining and verifying stated noise emission val- ues of machinery and equipment - Part I: General considerations and definitions. IS0 7574-2:1985, Acoustics - Statistical methods for determining and verifying stated noise emission val- ues of machinery and equipment - Part 2: Methods for stated values for individual machines. IS0 7574-4: 1985, Acoustics - Statistical methods for determining and verifying stated noise emission val- ues of machinery and equipment - Part 4: Methods for stated values for batches of machines. IS0 9614-I :I 993, Acoustics - Determination of sound power levels of noise sources using sound in- tensity - Part 1: Measurement at discrete points. IS0 9614-2:1996, Acoustics - Determination of sound power levels of noise sources using sound in- tensity - Part 2: Measurement by scanning. IS0 11200: 1995, Acoustics - Noise emitted by ma- chinery and equipment - Guidelines for the use of basic standards for the determination of emission sound pressure levels at a work station and at other specified positions. IS0 11201 :I 995, Acoustics - Noise emitted by ma- chinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions. - Engineering method in an es- sentially free field over a reflecting plane. IS0 I 1202:1995, Acoustics - Noise emitted by ma- chinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Survey method in situ. IS0 11203:1995, Acoustics - Noise emitted by ma- chinery and equipment - Determination of emission sound pressure levels at a work station and at other specified positions from the sound power level. IS0 11204:1995, Acoustics - Noise emitted by ma- chinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions - Method requiring environmental corrections. IEC 651:1979, Sound level meters, and Amendment I : 1993. I EC 804: 1985, Integrating-averaging sound level meters, and Amendment I:1989 and Amendment 2:1993. 3 Definitions For the purposes of this International Standard, the followin g definitions apply. 3.1 machinery and equipment: An assembly of linked parts or components with the appropriate ac- tuators, control and power circuits, etc., joined to- gether for a specific application. Also included in this definition is an assembly of machines which, in order to achieve the same end, are arranged and controlled so that they function as a whole. 3.2 family of machinery or equipment: Machinery or equipment of similar design or type, intended to perform the same functions. 3.3 batch (lot) of equipment: A number of units of machinery or equipment of the same family produced in quantity, manufactured to the same technical specifications and characterized by the same declared noise emission values. NOTE 1 The batch may be either an entire production series or a portion thereof. 3.4 operating mode: A condition in which the ma- chinery or equipment is performing its intended func- tion for the purpose of determining its noise emission values. 3.5 emission: Airborne sound radiated by a well- defined noise source (e.g. the machine under test) under specified operating and mounting conditions. NOTE 2 Emission values may be incorporated in a prod- uct label and/or product specification. The basic noise emission quantities are the sound power level of the source itself and the emission sound pressure levels at a work 2 SIST EN ISO 4871:1997
0 IS0 IS0 4871:1996(E) station and/or at ot cinity of the source her specified positions (if any) in the vi- NOTES 3.6 emission sound pressure, p: The sound press- ure, at a specified position near a noise source, when the source is in operation under specified operating and mounting conditions on a reflecting plane surface, excluding the effects of background noise and of re- flections other than those from the plane or planes permitted for the purpose of the test. It is expressed in pascals. 3.7 emission sound pressure level, Lp: Ten times the logarithm to base IO of the ratio of the square of the emission sound pressure, p* t), 4 to the square of the reference sound pressure, po, measured with a particular time weighting and a particular frequency weighting, se is expressed ure is 20 PPa, ected from those defined in IEC 651. It n decibels. The reference sound press- NOTES 3 Examples include: - maximum A-weighted emission sound pressure level with time weighting F: L,,AFmax; - C-weighted peak emission sound pressure level, L pC,peak- 4 The single-event emission sound pressure level is sometimes used and is defined in IS0 11201 to IS0 11204. The emission sound pressure level shall be deter- mined at a specified position and in accordance with either a test code for a specific family of machines or, if no code exists, a method that complies with the IS0 11200 series. 3.8 time-averaged emission sound pressure level, LpeqT: Emission sound pressure level of a con- tinuous steady sound that, within a measurement time interval, T, has the same mean square sound pressure as a sound under consideration which varies with time. It is expressed in decibels. It is given by the following equation: L peqT = IO Ig 1 T -4 T 0 2 P (4 2 PO dt dB . . . (1) A-weighted time-averaged emission sound pressure levels are denoted by LpAeqT, which is usually abbrevi- ated to LpA. LpAeqT shall be measured with an instru- ment which - complies with the requirements of IEC 804. 5 In general, the subscripts “eq” and “T” are omitted since time-averaged emission sound pressure levels are necessarily determined over a certain measurement time interval. 6 Equation (I) is identical to that for the familiar IS0 envi- ronmental noise descriptor “equivalent continuous sound pressure level” defined in IS0 1996-I. However, the emis- sion quantity defined above is used to characterize the noise emitted by a machine under test and assumes that stan- dardized measurement and operating conditions as well as a controlled acoustical environment are used for the measurements. 3.9 sound power, W: The rate per unit time at which airborne sound energy is radiated by a source. It is expressed in watts. 3.10 sound power level, L,: Ten times the logar- ithm to the base IO of the ratio of the sound power radiated by the source under test to the reference sound power. It is expressed in decibels. The frequency weighting or the width of the fre- quency band used shall be indicated. The reference sound power is I pW (IO-‘* W). NOTE 7 For example, the A-weighted sound power level is &*. 3.11 noise emission value: A general term by which any one or more of the A-weighted sound power level, b*, or the A-weighted time-averaged emission sound pressure level, LpA, or the C-weighted peak emission sound pressure level, Lpc peak, is in- , ferred. 3.12 measured noise emission value, L: The A- weighted sound power level, or the A-weighted time-averaged emission sound pressure level, or the C-weighted peak emission sound pressure level, as determined from measurements. Measured values may be determined either from a single machine or from the average of a number of machines, and are not rounded. 3.13 noise emission declaration: Information on the noise emitted by the machine, given by the manufacturer or supplier in technical documents or other literature concerning noise emission values. The noise emission declaration may take the form of ei- ther the declared single-number noise emission value or the declared dual-number noise emission value. 3.14 uncertainty, K: Value of the measurement un- certainty associated with a measured noise emission value. It is expressed in decibels. SIST EN ISO 4871:1997
IS0 4871:1996(E) CJ IS0 NOTE 8 annex A. Guidance on appropriate values for K is given in 3.15 declared single-number noise emission value, Ld: The sum of a measured noise emission value and the associated uncertainty, rounded to the nearest decibel: Ld=L+K NOTE 9 IS0 9296 requires that the declared A-weighted sound power level, bAdI of computers and business equip- ment be expressed in bels using the identity 1 B = 10 dB, rounded to the nearest 0,l B. 3.16 declared dual-number noise emission value, L and K: A measured noise emission value, L, and its associated uncertainty K, both rounded to the nearest decibel. application of the same noise emission measurement method on the same noise source at different times and under different conditions (different laboratory, different operator, different apparatus). The standard deviation of reproducibility, therefore, includes the standard deviation of repeatability. 3.22 standard deviation of production, ap: Stan- dard deviation of noise emission values obtained on different equipment from a batch of the same family, using the same noise emission measurement method under repeatability conditions (same laboratory, same operator, same apparatus). 3.23 total standard deviation a,: Square root of the sum of the squares of the standard deviation of reproducibility and the standard deviation of pro- duction: NOTE 10 If a specific noise test code requires that the mean emission sound pressure level from a number of specified positions be declared, it is denoted by LpAm. J 2 2 01 = OR + OP 3.24 reference standard deviation, GM: A total 3.17 work station; operator’s position: A position in the vicinity of the machine under test which is in- tended for the operator. standard deviation specified for the family of machin- et-y and equipment, which is considered typical for batches of equipment from this family. 3.18 operator: An individual whose work station is in the vicinity of a machine and who is performing a work task associated with that machine. 3.19 specified position: A position defined in re- lation to a machine, including, but not limited to, an operator’s position. The position can be a single, fixed point, or a combination of points along a path or on a surface located at a specified distance from the ma- chine, as described in the relevant noise test code, if any. NOTE 13 The use of a fixed value for GM for each family enables the application of a statistical method to deal with small sample sizes. If the total standard deviation, Q~, is dif- ferent from the reference standard deviation, aM, th
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