Of the 21 Helicopters represented in INM 7.0b, only five include the tone-corrected metrics. The calculation of these metrics involves the analysis of 1/3 octave-band data obtained during the source data measurement process, and requires sound-pressure levels at all measured frequency bands (50-10,000 Hz) for the duration of the aircraft event. A census of data availability was undertaken for helicopters currently in the INM, to determine whether available source data were sufficient to reprocess and calculate the tone-corrected metrics.
The Federal Aviation Administration (FAA) aircraft noise modeling tools Aviation Environmental Design Tool (AEDTc) and Integrated Noise Model (INM) do...
Currently, INM and AEDT do not use spectral data below 50 Hz in their noise computations. However, helicopter rotor rotational noise is dominant below...
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