Comparison of Noise from High-Performance Military Aircraft for Ground Run-up and Flyover Operations

While the majority of jet noise analysis takes place with a static jet or aircraft, airbase and community military jet noise exposure happens for the most part when the aircraft is in flight. Comparisons between flyover and ground run-up measurements for high-performance military aircraft have not been previously published. This paper presents comparisons between static ground run-up and flyover measurements for the F-35 operating at 150% Engine Thrust Request. The overall sound pressure levels and spectra are shown for the two scenarios, as well as indicators of nonlinear propagation and shock content, specifically the derivative skewness and average steepening factor. The overall sound pressure level is reduced in the peak radiation direction aft of the aircraft but increased in the forward direction. The peak frequency of the noise is relatively unaffected by flight effects, though the amplitude of each frequency may vary. The increase in level in the forward direction results in shock formation that is absent during ground run-up measurements.

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