ISO 4871:1996 download free

07-14-2021 comment

ISO 4871:1996 download free.Acoustics – Declaration and verification of noise emission values of machinery and equipment.
Information on the acoustic noise emitted by machinery and equipment is needed by users, planners, manufacturers and authorities. This inlormateon 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 f or 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) Measurement of noise emission
The ISO 3740 series specifies methods for determining the sound power levels of noise sources from sound pressure level measure- merits; the ISO 9614 series specifies methods for determining the sound power Levels from sound intensity level measurements; the ISO 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 measurement of the noise emissions of individual types of machinery which are based on these methods.
b) Determination of the noise emission value to be dedared
The ISO 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 levels used to define noise immission, the term ‘emission sound pressure level” is used in ISO 4871.
C) Presentation of declared noise emission values
It is of prime importance to declare sound power levels. It is recognized. 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 appropriate to the particular family.
d) Verification of declared noise emission values
The ISO 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 procedures of ISO 4871 are applied to the verification of
ISO 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.
ISO 3745:1977, Acoustics — Determination of sound power levels of noise sources — Precision methods for anechoic and sem,-anechoic rooms.
ISO 3746:1995. Acoustics — Determination of sound power levels of noise sources using Sound pressure
— Survey method using an enveloping measurement sudace over a reflecting plane.
ISO 3747:1987, Acoustics — Determination of Sound power levels of noise sources — Survey method using a reference sound source.
ISO 7574-1:1985, Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 1: General considerations and definitions.
ISO 7574-2:1985, Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 2: Methods for stated values for individual machines.
ISO 7574-4:1985, Acoustics — Statistical methods for determining and verifying stated noise emission valties of machinery and equipment — Part 4: Methods for stated values for batches of machines.
ISO 9614-1:1993, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points.
ISO 9614-2:1996, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2: Measurement by scanning.
ISO 11200:1995. Acoustics — Noise emitted by machinery 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
ISO 11201:1995. Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Engineering method in an essentialty free field over a reflecting plane.
ISO 11202:1995. Acoustics — Noise emitted by machinery arid equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Survey method in situ.
NOTES
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 (1) is identical to that for the familiar ISO environmental noise descriptor ‘equivalent continuous sound pressure level’ defined in ISO 1996-1. However, the emissian quantity defined above is used to characterize the noise emitted by a machine under test and assumes that standardized measurement and operating conditions as well as a controlled acoustical environment are used fo4 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 logarithm to the base 10 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 frequency band used shall be indicated. The reference sound power is 1 pW (10 12 ‘M.
NOTE 7 For example, the A-weighted sound power level
3.11 noise emission value: A general term by which any one or more of the A-weighted sound power level. LwA. or the A-weighted time-averaged emission sound pressure level, L. or the C-weighted peak emission sound pressure level, is inferred –
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 either the declared single-number noise emission value or the declared dual-number noise emission value.
3.14 uncertainty, K: Value of the measurement uncertainty associated with a measured noise emission value. It is expressed in decibels.
16 The manufacturer or supplier may optionally provide frequency band data, in addition to the information which has to be dedared
17 The preferred declared noise emission quantity is the declared A-weighted sound power level, either L,. or A and KWA. The A-weighted sound power level is the basic noise emission quantity adopted in the ISO 7574 series, and the one which most accurately tracks changes in noise emission from one piece of machinery and equipment to another.
18 Noise decfaration for computer and business equipment should be in accordance with ISO 9296
19 The C-weighted peak emission sound pressure levels yielded by the products of many industries are so low as to make declaration of thes quantity unnecessary. In such cases, general information on the C-weighted peak emission sound pressure levels should be contained in the noise test codes for the specific families of machinery and equipment produced by these industries.
6 Verification of noise emission declarations
6.1 General
The quantty to be verified is either the declared single-number noise emission value L. or the sum of the measured noise emission value L. and the uncertainty K, depending on the form of the noise emission declaration. Verification shall be effected by means of noise measurements made according to the same noise test code, or. if there is no noise test code, according to a basic measurement standard with the same or better grade of accuracy, and under the same machinery or equipment operating conditions as those to which the declared noise equation values refer.
NOTE 20 Verification of the noise emission declaration using a basic test method with a lower grade of accuracy may be effected by agreement between the manufacturer and user, providing aflowance is made for the lower accuracy.
The choice of verification on a single machine or a batch of machines is made in the relevant noise test code.
The procedures given in 6.2 and 6.3 are designed for inspection under reproducibility conditions.

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