Bresciani Andrea P C, Maillard Julien, de Santana Leandro D
University of Twente, P.O. Box 217, Enschede, 7500 AE, the Netherlands.
Centre Scientifique et Technique du Bâtiment (CSTB), Saint-Martin-d'Hères, 38400, France.
J Acoust Soc Am. 2023 Aug 1;154(2):1179-1190. doi: 10.1121/10.0020666.
The sound propagating in a turbulent atmosphere fluctuates in amplitude and phase. This phenomenon, known as acoustic scintillation, is caused by random fluctuations in the acoustic refractive index of the air induced by atmospheric turbulence. Auralization techniques should consider this phenomenon to increase the realism of the synthetic sound. This paper proposes a physics-based formulation to model sequences of log-amplitude and phase fluctuations of a sound propagating in a turbulent atmosphere. This method applies to slanted and vertical propagation of the sound, which is useful for simulating elevated noise sources such as aircraft, drones, and wind turbines. The theoretical framework is based on the spatial correlation functions for the log-amplitude and phase fluctuations for spherical waves, the von Kármán spectrum, and similarity theories to model atmospheric turbulence. Two applications with audio files are presented to demonstrate the applicability of this method to tonal and broadband noise.
在湍流大气中传播的声音，其振幅和相位会发生波动。这种被称为声学闪烁的现象，是由大气湍流引起的空气声折射指数的随机波动造成的。可听化技术应考虑这一现象，以提高合成声音的真实感。本文提出了一种基于物理的公式，用于对在湍流大气中传播的声音的对数振幅和相位波动序列进行建模。该方法适用于声音的倾斜和垂直传播，这对于模拟诸如飞机、无人机和风力涡轮机等高空噪声源很有用。理论框架基于球面波对数振幅和相位波动的空间相关函数、冯·卡门频谱以及用于模拟大气湍流的相似理论。文中给出了两个音频文件应用示例，以证明该方法对音调噪声和宽带噪声的适用性。
