Examination of the low frequency limit for helicopter noise data in the Federal Aviation Administration's Aviation Environmental Design Tool and Integrated Noise Model

Details

• Alternative Title:
  Noise-Con 2010, Baltimore, MD, April 19-21, 2010
• Creators:
  Boeker, Eric R. ; Schulz, Noah E.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Corporate Contributors:
  United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy
• Subject/TRT Terms:
  • Helicopters
  • Aircraft noise
  • Noise sources
  • Ambient noise
  • Sound level
  • Measurement of specific phenomena
  • Effective sound pressure
  • Noise prediction
  • Noise model
  • Helicopter noise
  More +
• Resource Type:
  In Proceedings
• Geographical Coverage:
  United States
• Corporate Publisher:
  John A. Volpe National Transportation Systems Center (U.S.)
• Abstract:
  The Federal Aviation Administration (FAA) aircraft noise modeling tools Aviation Environmental Design Tool (AEDTc) and Integrated Noise Model (INM) do not currently consider noise below 50 Hz in their computations. This paper describes a preliminary study to determine the effect of including low-frequency data on the accuracy of AEDT/INM results. Expanded aircraft noise spectra containing one-third octave band data to 12.5 Hz were analyzed using methods adapted from AEDT/INM. Results from expanded spectral data are compared with results from the historical AEDT/INM spectral data (one-third octave band data from 50 Hz to 10 kHz). This comparison showed a range of differences, from increases in overall un-weighted sound pressure levels (SPL), to negligible changes in A-weighted and Time Audible metrics. These changes may be particularly important for helicopters, with dominant low-frequency rotor noise below 50 Hz. Following the comparison, the potential implementation of expanded spectral data in AEDT is discussed.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/12004/dot_12004_DS1.pdf
• File Type:
  [PDF - 302.54 KB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:c2b2255391e99fee927acbd991551d57e3a8644dce596d0e5504f1122714e0dc