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ASA - ANSI/ASA S12.44

AMERICAN NATIONAL STANDARD Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions from Sound Power Level

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Organization: ASA
Publication Date: 27 January 1997
Status: active
Page Count: 22
scope:

General

This Standard specifies two methods for determining the emission sound pressure levels of machinery and equipment, at workstations and at other specified positions nearby, by calculation form the sound power level. The principal purpose of this determination is to permit comparison of the performance of different units of a given family of machinery or equipment, under defined environmental conditions and standardized mounting and operating conditions.

Emission sound pressure levels are determined with the same frequency weighting and time weighting, or in the same frequency bands, as those for which the corresponding sound power levels were determined.

NOTES:

This Standard is closely related to the measurement of emission sound pressure levels of machinery and equipment at workstations and other specified positions as specified in ANSI S12.43-1997. Guidance on the selection of a measurement method form ANSI S12.43-1197 or a method of calculating emissions sound pressure levels from sound power levels as specified in this Standard is provided in annex A of S12.43-1997. That annex, including its table and figures, is also included in this Standard as annex A.

At any given position in relation to a particular machine, and for given mounting and operating conditions, the emission sound pressure levels determined by the methods of this Standard will in general be less than the directly measured sound pressure levels or the same machine in the typical workroom where it is used. This is because of reverberation and the contributions of other machines. Commonly observed difference are 1 dB and 5 dB. In extreme cases, the difference may be greater.

Types of noise and noise sources

This Standard is, in prinCiple, applicable to moving or stationary machines, for indoor or outdoor use, particularly those machines which are mass produced. The methods of this Standard are not applicable to highly directional sound sources used outdoors.

This Standard is particularly applicable to machines for which the largest dimension is less than or equal to 1 m. It is also applicable to larger machines in certain cases (see 6.2.3).

This Standard is applicable to all types of sounds for which methods for determining the sound power level are available.

Test environment

The test environment to be used is that which is specified for the determination of the sound power level in accordance with the Standards of the ANSI 512.30 series.

Specified positions

This Standard is applicable to workstation positions and other specified pOSitions in the vicinity of the source under test where emission sound pressure levels are to be determined. It is not applicable to workstations and other defined positions which are situated inside a cab or a cabin, or behind an acoustical screen.

A workstation position can be a single point, corresponding to the specified position of a standing or seated operator. It can also be a specified path.

NOTE - More detailed specifications regarding seated, standing, stationary, or moving operators, as well as information concerning bystanders, are provided in ANSI S 12.43-1997.

Specific field of application of each method

Specific information on the field of application of each of the two methods described in this Standard is given in clauses 6.2.2 and 6.2.3.

Document History

ANSI/ASA S12.44
January 27, 1997
AMERICAN NATIONAL STANDARD Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions from Sound Power Level
General This Standard specifies two methods for determining the emission sound pressure levels of machinery and equipment, at workstations and at other specified positions nearby, by calculation...
January 27, 1997
American National Standard Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions from Sound Power Level
General This Standard specifies two methods for determining the emission sound pressure levels of machinery and equipment, at workstations and at other specified positions nearby, by calculation...
January 27, 1997
American National Standard Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions from Sound Power Level
This Standard provides a method for determining emission sound pressure levels from the sound power level produced by all types of machinery and equipment at workstations and other specified...
January 27, 1997
American National Standard Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions from Sound Power Level
A description is not available for this item.
January 27, 1997
American National Standard Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions from Sound Power Level
A description is not available for this item.
January 27, 1997
American National Standard Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions from Sound Power Level
A description is not available for this item.

References

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