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- W2051280358 abstract "Corrections to flyover perceived-noise level (PNL) are required to account for varying durations of aircraft flyover noise signals. The magnitude of the duration of takeoff and landing flyover noise signals has been determined for two turbofan-powered jet transports, the DC-8 airplane with JT3D short fan-discharge duct engines and the DC-9 airplane with JT8D long fan-discharge duct engines. Recordings of actual flyover noise signals from these two aircraft over a range of altitudes were analyzed in 13-oct bands using digital techniques. Instantaneous PNL's and over-all sound-pressure levels (SPL) were determined and plotted by a machine under program control. For altitudes greater than 800 ft, maximum values of the PNL and the over-all SPL did not occur simultaneously, and the time between the 10-PNdB down points was considerably shorter than the time between the 10-dB down points on the over-all SPL. The duration of the top 10 PNdB of both DC-8 and DC-9 noise signals correlated well with the altitude of the aircraft." @default.
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- W2051280358 date "1966-11-01" @default.
- W2051280358 modified "2023-10-11" @default.
- W2051280358 title "Duration of Flyover Noise Level during Takeoff and Landing" @default.
- W2051280358 doi "https://doi.org/10.1121/1.1943056" @default.
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