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- W2034370832 abstract "The BVI impulsive content of a rotor acoustic signal is shown to appear in the mid-frequency range of the power spectrum, between the fifth and thirtieth harmonics of the blade passage frequency, concentrated at the harmonics of the blade passage frequency. These harmonics exhibit a humped or scalloped shape in this mid-frequency spectral region. Increased energy at the harmonics of the shaft frequency appears when the BVI impulsive content demonstrates unsteadiness and blade-to-blade differences in the time domain. A mathematical model of a generalized BVI acoustic signal and its power spectrum shows that the power spectrum is scalloped and filtered by a comb function. The spectrum amplitude is defined by the impulse amplitude and emission time. The scalloping of the spectrum is related to the emission time of the impulse itself, and the spacing of the comb function is related to the repetition time (period) of the impulse. The decay rate of the spectral humps is governed by the inverse of frequency squared. The mathematical model validates the characteristics observed in the data and verify that these characteristics are due to blade-vortex interaction activity." @default.
- W2034370832 created "2016-06-24" @default.
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- W2034370832 date "1987-03-24" @default.
- W2034370832 modified "2023-09-26" @default.
- W2034370832 title "The spectral characteristics of rotor blade-vortex interaction noise- Experimental and mathematical results" @default.
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- W2034370832 doi "https://doi.org/10.2514/6.1987-251" @default.
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