ISO 13472-2:2010
Acoustics — Measurement of sound absorption properties of road surfaces in situ — Part 2: Spot method for reflective surfaces
ISO 13472-2:2010 specifies a test method for measuring in situ the sound absorption coefficient of road surfaces for the one-third-octave-band frequencies ranging from 250 Hz to 1 600 Hz under normal incidence conditions. For special purposes, the frequency range can be changed by modifying the dimensions of the system.
The test method is intended for: a) determination of the sound absorption coefficient of semi-dense to dense road surfaces (and, if of interest, also the complex acoustical impedance); b) determination of the sound absorption properties of test tracks in accordance with standards such as ISO 10844 and test surfaces defined in national and international type approval regulations for road vehicles and vehicle tyres; c) verification of the compliance of the sound absorption coefficient of a road surface with design specifications or other requirements.
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Scope
Normative references
Terms and definitions
Principle
Test equipment
Components of the test system
Sound source
Test signal
Impedance tube
Tube diameter
Tube length and microphone positions
Microphones
In-situ test fixture between impedance tube and test surface
Signal-processing system
Thermometer and pressure measurement
Measurement and analysis procedure
Stabilizing the system
Calibration of the system
Reference measurement
Background noise measurement
Measurement of a road surface
Data analysis
Positioning of the equipment
Location of the measurement positions
Test surfaces such as those meeting ISO 10844 requirements
Regular roads
Condition of the road surface
Temperature
Measurement and analysis procedure
Measurement uncertainty
Test report
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Scope
Normative references
Terms and definitions
Principle
Test equipment
Components of the test system
Sound source
Test signal
Impedance tube
Tube diameter
Tube length and microphone positions
Microphones
In-situ test fixture between impedance tube and test surface
Signal-processing system
Thermometer and pressure measurement
Measurement and analysis procedure
Stabilizing the system
Calibration of the system
Reference measurement
Background noise measurement
Measurement of a road surface
Data analysis
Positioning of the equipment
Location of the measurement positions
Test surfaces such as those meeting ISO 10844 requirements
Regular roads
Condition of the road surface
Temperature
Measurement and analysis procedure
Measurement uncertainty
Test report