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.
Accurate prediction of highway noise has been a major problem for state highway departments. Many noise models have been proposed to alleviate this pr...
Preliminary measurements have been made on the acceleration and vibration environment of the Mark I vehicle while operating on the New York City Trans...
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United States Department of Transportation
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