An examination of the spectral class low frequency limit for helicopters

Schulz, Noah E.; Boeker, Eric; John A. Volpe National Transportation Systems Center (U.S.)

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

i

An examination of the spectral class low frequency limit for helicopters

2011-01-01
By Schulz, Noah E. ; Boeker, Eric

English

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Details:

Creators:

Schulz, Noah E. ; Boeker, Eric

Schulz, Noah E. ; Boeker, Eric Less -
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:

[+]

Aircraft Noise Helicopter Noise Helicopter Noise Data Helicopters Integrated Noise Model Low Frequency Noise Measurement Of Electromagnetic Phenomena Noise Metrics Noise Model Noise Prediction Noise Sources Sound Level
Publication/ Report Number:

DOT-VNTSC-FAA-14-03
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

John A. Volpe National Transportation Systems Center (U.S.)
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.
Format:

PDF
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:ed55635d044a911343b3881c54870c3e39532ab03ab38f10d98b177944439a15
Download URL:

https://rosap.ntl.bts.gov/view/dot/12003/dot_12003_DS1.pdf
File Type:

[PDF-1.13 MB]