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Title: Prediction and modeling of helicopter noise
Authors: Raspet, Richard.
Kief, Mark.
Daniels, Raymond.
Keywords: Helicopters--Noise
Publisher: Construction Engineering Research Laboratory (U.S.)
Series/Report no.: Technical Report ; N-186
Abstract: Sound exposure level (SEL) data from three Army helicopters were used to test a proposed method for calculating sideline decay developed for fixed-wing aircraft. The Federal Aviation Administration (FAA) and the U.S. Air Force (USAF) have adopted this method for use with fixed-wing aircraft, and it was desired to know if the same method could predict rotary-wing aircraft sideline decay with distance or if a more complex computer model is necessary. The procedure was found accurate for limited altitudes and slant distances. In addition, the sideline decay data were studied using variables known to affect sound attenuation. The purpose was to gain further insight into the mechanisms of sideline decay with distance. Variations in the results suggest an unknown mechanism is contributing to this attenuation.
Description: Technical Report
Appears in Collections:Technical Report

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