The FAA has been conducting controlled helicopter noise measurement programs since 1976. The data have been used for a variety of purposes including evaluation of proposed U.S. and international noise standards, validation of helicopter noise prediction methodologies, and development of practical heliport design guidance. In order to supplement the results of the controlled tests, field survey data are also being gathered to represent in-service operating conditions. Measurements are intended to represent helicopter noise within the context of urban ambient background noise. The results reported in this document are termed 'survey measurements', as opposed to controlled test data, in order to reflect the limited control imposed over factors which contribute to the variability of measured noise levels. Noise data are presented for the Bell 206-L, Aerospatiale Alouette III, and the Aerospatiale A-Stare, SA-350. Operational modes include approach, takeoff, hover, and flat-pitch-idle. Noise dta include A-weighted Sound Level time histories, maximum A-Weighted Sound Level (LASm), Sound Exposure Level (LAE), and Equivalent Sound Level (Leq). (Author)
A Survey of Helicopter and Ambient Urban Noise Levels in Phoenix, Arizona
1982
44 pages
Report
Keine Angabe
Englisch
Air Transportation , Noise Pollution & Control , Aircraft noise , Ambient noise , Acoustic measurement , Urban areas , Background noise , Sound pressure , Surveys , Exposure(General) , Approach , Takeoff , Hovering , Pitch(Inclination) , Helicopters , Heliports , Noise pollution , Arizona , Tables(Data) , Phoenix(Arizona)