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Measuring Tire-Pavement Noise at the Source (2009) / Chapter Skim
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Attachment - Proposed Method of Test for Measurement of Tire-Pavement Noise Using the On-Board Sound Intensity (OBSI) Method
Pages 32-35

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From page 32...
... 4. Summary of Methods A method is described in which a sound intensity probe is installed directly on a test vehicle using an appropriate fixture and tire-pavement noise from a standard test tire is measured.
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From page 33...
... Data is acquired for 1⁄3 octave bands centered at 400 to 5,000 Hz and checked to ensure that data quality criteria are met. The results from the leading and trailing edge positions for each run are averaged together and then the tire averages for individual runs are averaged, resulting in the overall A-weighted OBSI level and 1⁄3 octave band levels that are reported for each pavement section.
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From page 34...
... Pavement sections that are too short to allow this averaging time or are suspected of not being consistent throughout the specified shorter averaging period are acceptable as long as all Data Quality Criteria are met. 7.5.2 The mean sound pressure level of the probe microphone pair and coherence of the sound pressure signals between the microphone pair shall be measured.
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From page 35...
... 9.3 Other information that shall be reported include air and pavement temperature range during testing, location and description of the test pavement, the date of the measurement, period of the performance of the measurements, and test speed. 9.4 Additional information to be made available on request shall include wind conditions during the measurements, barometric pressure used for air density calculation, coherence, SIindex, probe configuration, and test vehicle make and model.
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Key Terms

  • test tire
  • trailing edge
  • test vehicle
  • overall accuracy
  • sound pressure

  • test speed
  • octave bands
  • data quality
  • pressure level
  • quality criteria

  • noise using
  • test method
  • standard test
  • wind speed
  • contact patch

  • reference test
  • mean sound
  • valid data
  • acoustic data
  • noise generation

  • obsi probe
  • intensity level
  • provisional standard
  • probe locations
  • obsi measurements

  • tire contact
  • obsi level
  • bands centered
  • particle velocity
  • square meter


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