This report documents the results of an international round robin test on the analysis of helicopter noise. Digital spectral noise data of a 3.5-second simulated helicopter flyover and identical analog test tapes containing helicopter noise data, reference signals, test tones and time code signals were sent to 13 participating organizations. The purpose of the test was to evaluate data reduction systems and procedures; to determine the magnitude of the variability between representative systems and organizations; and to identify potential causes and assist in establishing recommended procedures designed to minimize the variablity. (Author)
Helicopter Noise Analysis--Round-Robin Test
1981
79 pages
Report
Keine Angabe
Englisch
Aircraft , Air Pollution & Control , Aircraft noise , Acoustic measurement , Data reduction , Standardization , Test and evaluation , Helicopters , Overflight , Simulation , Sound transmission , Acoustic data , Spectrum analysis , Spectral energy distribution , Indexes(Ratios) , Tape recording , Acoustic signals , Signal processing , Corrections , Meteorological data , Digital systems , Analog systems , Reference signals
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