United States Department of Transportation
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An examination of the spectral class low frequency limit for helicopters
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2011-01-01
[PDF-1.13 MB]
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-Aviation Energy and EnvironmentNTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENTNTL-AVIATION-Aviation Energy and Environment
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Abstract:Currently, INM and AEDT do not use spectral data below 50 Hz in their noise computations. However, helicopter rotor rotational noise is dominant below 50Hz, with a fundamental frequency at the blade-pass frequency (BPF) and harmonics at integer multiples of BPF. Noise data for several helicopters have been measured for inclusion in the INM/AEDT database with expanded spectral data down to 12.5 Hz. The purpose of this effort is to determine what effects, if any, inclusion of low frequency data will have on resulting noise modeling. The results of which would determine if and how an expanded-spectra capability should be included in AEDT.
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