Movement of air over a hole or cavity typically generates sound, which can have both noisy and tonal components (cavity noise, cavity tones). Such acoustic phenomena often tend to be a nuisance, e.g. for ‘buffeting’ or ‘wind throbbing’ noise, where airflow over an open side window or sunroof in a moving vehicle can produce low-frequency, high-amplitude ‘booming’ sound signals. The present contribution provides a first description of this curious phenomenon of everyday physics at an intermediate difficulty level, comparing a simplified theoretical model based on a Helmholtz resonator with experimental data obtained by everyday mobile IT devices—namely smartphones or tablet PC. Readers thus are able to reproduce and study the buffeting frequency of a car interior, based on relatively inexpensive equipment using their own mobile devices for data acquisition and analysis.

空气在孔或空腔上的运动通常会产生声音，它可能同时具有噪声和音调分量（空腔噪声、空腔音调）。此类声学现象通常会令人讨厌，例如对于“颤动”或“风动”噪声，在这种情况下，行驶中车辆中打开的侧窗或天窗上方的气流会产生低频、高振幅的“轰鸣”声信号。本论文首次描述了这种中等难度级别的日常物理奇特现象，将基于亥姆霍兹谐振器的简化理论模型与日常移动 IT 设备（即智能手机或平板电脑）获得的实验数据进行了比较。读者因此能够再现和研究汽车内部的抖动频率，