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ASTM E3207-21

(Classification)

Standard Classification for Determination of Low-Frequency Impact Noise Ratings

Standard Classification for Determination of Low-Frequency Impact Noise Ratings

SIGNIFICANCE AND USE
4.1 The purpose of the LIR rating is to describe the low-frequency impact noise, often referred to as “thudding,” primarily generated by footfall on lightweight structures. The rating increases as the impact sound attenuation of the floor-ceiling structure increases. This rating has been shown to correlate with subjective reaction3,4 and can be used to evaluate and compare the low-frequency impact noise performance of assemblies.  
4.2 The LIIC rating can be used for relative comparison and to rank-order the low-frequency performance of assemblies within a given test laboratory.5 The reproducibility of LIIC between laboratories has not been measured, and the relationship between laboratory and field ratings (LIIC and LIR) is not assumed or established.
Note 1: The tendency for measurement uncertainty to increase at low frequencies should be considered when utilizing metrics of classification standard.
Note 2: This classification does not replace Classification E989 (Impact Insulation Class) and is not interchangeable with it. For example, the LIIC rating of an assembly does not determine its IIC rating and cannot be used to show compliance with an IIC requirement. The expectation is that the low-frequency ratings would be reported alongside the existing ratings.  
4.3 This classification shall only be used with one-third-octave-band data.
SCOPE
1.1 This classification provides methods for calculating single-number ratings of low-frequency impact noise transmission, based on one-third-octave-band impact noise levels as described in Test Methods E492 and E1007.  
1.2 This classification defines ratings that are not defined in other standards. Other standards may define additional ratings based on the methods of this classification.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Jun-2021
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.10 - Structural Acoustics and Vibration
Current Stage
Ref Project

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ASTM E3207-21 - Standard Classification for Determination of Low-Frequency Impact Noise RatingsASTM E3207-21 - Standard Classification for Determination of Low-Frequency Impact Noise Ratings
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ASTM E3207-21 - Standard Classification for Determination of Low-Frequency Impact Noise Ratings
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E3207 −21
Standard Classification for
1
Determination of Low-Frequency Impact Noise Ratings
This standard is issued under the fixed designation E3207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Ceiling Assemblies and Associated Support Structures
1.1 This classification provides methods for calculating
3. Terminology
single-number ratings of low-frequency impact noise
3.1 Definitions—The following terms used in this classifi-
transmission, based on one-third-octave-band impact noise
cation have specific meaning that are defined in Terminology
levels as described in Test Methods E492 and E1007.
C634: average sound pressure level; decibel; flanking trans-
1.2 This classification defines ratings that are not defined in
mission; impact insulation class; level; octave band; sound
other standards. Other standards may define additional ratings
insulation; sound isolation; sound pressure; sound pressure
based on the methods of this classification.
level.
1.3 Units—The values stated in SI units are to be regarded
3.2 Definitions—The following terms used in this classifi-
as standard. No other units of measurement are included in this
cation have specific meaning that are defined in Test Method
standard.
E492: normalized sound pressure level, L .
n
1.4 This standard does not purport to address all of the
3.3 Definitions—The following terms used in this classifi-
safety concerns, if any, associated with its use. It is the
cation have specific meaning that are defined in Test Method
responsibility of the user of this standard to establish appro-
E1007: impact sound pressure level, ISPL.
priate safety, health, and environmental practices and deter-
3.4 Definitions of Terms Specific to This Standard:
mine the applicability of regulatory limitations prior to use.
3.4.1 low-frequency impact insulation class, LIIC, n—of a
1.5 This international standard was developed in accor-
floor ceiling assembly installed in a laboratory, the single-
dance with internationally recognized principles on standard-
number rating calculated in accordance with this classification
ization established in the Decision on Principles for the
using the normalized sound pressure levels (L ) measured as
n
Development of International Standards, Guides and Recom-
described in Test Method E492.
mendations issued by the World Trade Organization Technical
3.4.1.1 Discussion—This classification method uses the L
n
Barriers to Trade (TBT) Committee.
in the 50, 63, and 80 Hz one-third-octave bands. Measurement
2. Referenced Documents of these bands is described as desirable but not required inTest
2 Method E492. Measurement in these bands is required in order
2.1 ASTM Standards:
to calculate LIIC.
C634 Terminology Relating to Building and Environmental
3.4.1.2 Discussion—Except for the frequency range, no
Acoustics
change in Test Method E492 is required to measure LIIC.
E492 Test Method for Laboratory Measurement of Impact
3.4.2 low-frequency impact rating, LIR, n—the single num-
Sound Transmission Through Floor-Ceiling Assemblies
ber rating calculated in accordance with this classification
Using the Tapping Machine
using the impact sound pressure levels (ISPL) measured in a
E989 Classification for Determination of Single-Number
building, as described in Test Method E1007.
Metrics for Impact Noise
3.4.2.1 Discussion—This classification method uses the
E1007 Test Method for Field Measurement of Tapping
ISPL in the 50, 63, and 80 Hz one-third-octave bands.
Machine Impact Sound Transmission Through Floor-
Measurement of these bands is described as desirable but not
required inTest Method E1007. Measurement in these bands is
1
This classification is under the jurisdiction of ASTM Committee E33 on
required in order to calculate LIR.
Building and Environmental Acoustics and is the direct responsibility of Subcom-
3.4.2.2 Discussion—Except for the frequency range, no
mittee E33.10 on Structural Acoustics and Vibration.
change in Test Method E1007 is required to measure LIR.
Current edition approved July 1, 2021. Published July 2021. DOI: 10.1520/
E3207-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4. Significance and Use
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1 The purpose of the LIR rating is to describe the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. low-frequency impact noise, oft
...

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1.1 This test method covers the measurement of airflow resistance and the related measurements of specific airflow resistance and airflow resistivity of porous materials that can be used for the absorption and attenuation of sound. Materials cover a range from thick boards or blankets to thin mats, fabrics, papers, and screens. When the material is anisotropic, provision is made for measurements along different axes of the specimen.  
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1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4.1 Table 1 is provided for user to convert into cgs units.    
cgs acoustic ohm  
mks acoustic ohm (Pa·s/m3)  
105  
cgs rayl  
mks rayl (Pa·s/m)  
10    
cgs rayl/cm  
mks rayl/m (Pa·s/m2)  
103  
cgs rayl/in.  
mks rayl/m (Pa·s/m2)  
394  
mks rayl/in.  
mks rayl/m (Pa·s/m2)  
39.4  
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5.1 The spectrum of the noise in the room below the test specimen is determined by the following:  
5.1.1 The size and the mechanical properties of the floor-ceiling assembly, such as its construction, surface, mounting or edge restraints, stiffness, or internal damping,  
5.1.2 The acoustical response of the room below,  
5.1.3 The placement of the object or device producing the impacts, and  
5.1.4 The nature of the actual impact itself.  
5.2 This test method is based on the use of a standardized tapping machine of the type specified in 8.1 placed in specific positions on the floor. This machine produces a continuous series of uniform impacts at a uniform rate on a test floor and generates in the receiving room broadband sound pressure levels that are sufficiently high to make measurements possible beneath most floor types even in the presence of background noise. The tapping machine itself, however, is not designed to simulate any one type of impact, such as produced by male or female footsteps.  
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1.4 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
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  • Standard
    4 pages
    English language
    sale 15% off