Acoustics. Noise emitted by machinery and equipment. Determination of emission sound pressure levels at a work station and at other specified positions applying accurate environmental corrections (ISO 11204:2010)
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ISO 11204:2010 specifies a method for determining the emission sound pressure levels of machinery or equipment, at a work station and at other specified positions nearby, in any environment which meets certain qualification requirements. A work station is occupied by an operator and may be located in open space, in the room where the source under test operates, in a cab fixed to the source under test, or in an enclosure remote from the source under test. One or more specified positions may be located in the vicinity of a work station, or in the vicinity of an attended or unattended machine. Such positions are sometimes referred to as bystander positions. Emission sound pressure levels are determined as A-weighted levels. Additionally, levels in frequency bands and C-weighted peak emission sound pressure levels can be determined in accordance with ISO 11204:2010, if required. A method is given for determining a local environmental correction (subject to a specified limiting maximum value) to be applied to the measured sound pressure levels to exclude the effects of reflections from reflecting surfaces other than the plane on which the source under test is placed. This correction is based upon the mean sound pressure level on a measurement surface, the sound pressure level measured at a specified position, and either an environmental correction or the equivalent absorption area of the test room. With the method specified in ISO 11204:2010 results of accuracy grade 2 (engineering grade) or accuracy grade 3 (survey grade) are obtained. Corrections are applied for background noise and, as described above, for the acoustic environment. Instructions are given for the mounting and operation of the source under test and for the choice of microphone positions for the work station and for other specified positions. One purpose of the measurements is to permit comparison of the performance of different units of a given family of machines, under defined environmental conditions and standardized mounting and operating conditions. The method specified in ISO 11204:2010 is suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001. The method specified in ISO 11204:2010 is applicable to all types and sizes of noise sources. The type of test environment influences the accuracy of the determination of emission sound pressure levels. ISO 11204:2010 is applicable to an indoor or outdoor environment with one or more reflecting planes present, meeting specified requirements. These requirements on the room are less strict than those of ISO 11201, in particular regarding the acoustical quality of the environment. ISO 11204:2010 is applicable to work stations and other specified positions where emission sound pressure levels are to be determined. Appropriate positions where measurements may be made include the following: a) work station located in the vicinity of the source under test; this is the case for many industrial machines and domestic appliances; b) work station within a cab which is an integral part of the source under test; this is the case for many industrial trucks and earth-moving machines; c) work station within a partial or total enclosure (or behind a screen) supplied by the manufacturer as an integral part of the source under test; d) work station partially or totally enclosed by the source under test — this situation may be encountered with some large industrial machines; e) b
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Sisällysluettelo
Foreword
Introduction
1 Scope
1.1 General
1.2 Types of noise and noise sources
1.3 Test environment
1.4 Work station and other specified positions
2 Normative references
3 Terms and definitions
4 Instrumentation
4.1 General
4.2 Calibration
5 Test environment
5.1 General
5.2 Criterion for the adequacy of the test environment
5.3 Enclosed work station positions
5.4 Criteria for background noise
5.5 Ambient conditions during measurements
5.6 Local environmental correction and grade of accuracy
6 Measured quantities
7 Quantities to be determined
8 Mounting and operation of source under test
8.1 General
8.2 Location of source
8.3 Mounting of source
8.4 Auxiliary equipment
8.5 Operation of source during test
9 Microphone positions
9.1 General
9.2 Microphone position(s) for a seated operator
9.3 Microphone position(s) for a standing, stationary operator
9.4 Microphone position(s) for an operator moving along a specified path
9.5 Microphone positions for bystanders and for unattended machines
10 Measurements
10.1 Measurement time interval
10.2 Measurement procedure
11 Measurement uncertainty
11.1 Methodology
11.2 Determination of σomc
11.3 Determination of σR0
11.4 Typical upper bound values of σR0
11.5 Total standard deviation, σtot, and expanded uncertainty, U
12 Information to be recorded
12.1 General
12.2 Source under test
12.3 Test conditions
12.4 Acoustic environment
12.5 Instrumentation
12.6 Location of work station(s)
12.7 Noise data
13 Test report
Annex A Environmental correction for a work station — Determination of the local environmental correction, K3 (normative)
Annex B Criteria for background noise for measurements in frequency bands (normative)
Annex C Guidance on the development of information on measurement uncertainty (informative)
Annex D Principles of the methodology (informative)
IEC 60942:2003
IEC 61260 AMD 1:2001
IEC 61260:1995
IEC 61672-1:2002
ISO 12001:1996 Acoustics -- Noise emitted by machinery and equipment -- Rules for the drafting and presentation of a noise test code
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 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
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 1: General principles and definitions
ISO 5725-1:1994/Cor 1:1998
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-2:1994/Cor 1:2002
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 3: Intermediate measures of the precision of a standard measurement method
ISO 5725-3:1994/Cor 1:2001
ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 4: Basic methods for the determination of the trueness of a standard measurement method
ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results -- Part 5: Alternative methods for the determination of the precision of a standard measurement method
ISO 5725-5:1998/Cor 1:2005
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 6: Use in practice of accuracy values
ISO 5725-6:1994/Cor 1:2001
ISO/IEC Guide 98-3:2008 Uncertainty of measurement -- Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)