Influence of ground blocking on the acoustic phase variance in a turbulent atmosphere

Article Acoustics

Auralization of aircraft flyovers with turbulence-induced coherence loss in ground effect

Reto Pieren et al.

Summary: This paper presents a simple approach to include turbulence-induced coherence loss in ground effect, which increases the plausibility of aircraft flyover auralizations and reveals audible improvements in jet aircraft flyovers.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2022)

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Article Acoustics

Vertical and slanted sound propagation in the near-ground atmosphere: Coherence and distributions

Vladimir E. Ostashev et al.

Summary: This article investigates the coherence of acoustic signals in atmospheric turbulence and provides mathematical formulations for describing such coherence. Experimental data show that the theoretical models can predict the coherence characteristics of acoustic signals under different turbulent conditions with reasonable accuracy.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2021)

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Article Acoustics

Vertical and slanted sound propagation in the near-ground atmosphere: Amplitude and phase fluctuations

Matthew J. Kamrath et al.

Summary: This article experimentally investigated the amplitude and phase fluctuations of acoustic signals propagating along vertical and slanted paths, finding that the theory correctly predicted amplitude variances but overpredicted phase variances. Ground blocking of large eddies likely explains the discrepancy.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2021)

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Article Acoustics

Evaluation of numerical predictions of sonic boom level variability due to atmospheric turbulence

Trevor A. Stout et al.

Summary: The numerical model based on the KZK propagation equation and advanced turbulence model accurately simulates the full-scale N-wave sonic boom propagation in turbulent conditions. The predictions of the perceived level metric from the model closely match the measurements, especially under high turbulence conditions. This suggests that the KZK-based model is sufficiently accurate for approximating the PL distribution of N-waves and is useful for predicting public reaction to sonic booms in turbulent conditions.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2021)

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Article Meteorology & Atmospheric Sciences