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首页> 外文期刊>International Journal of Aerodynamics >Why a jetliner vibrates during takeoff: simulating air oscillations under the wing
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Why a jetliner vibrates during takeoff: simulating air oscillations under the wing

机译：飞机在起飞过程中为何振动：模拟机翼下方的空气振动

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摘要

Using a gas flow simulation tool, the oscillations of the air around the wing are analysed. It is pointed out that the flow behind and below the wing oscillates with sub- or low acoustic frequencies. Such external excitation may enter into resonance with the natural vibration frequencies of the wings and fuselage, which can produce a dangerous effect. The point of the article is that the fuselage vibration on takeoff depends mainly on what happens in the surrounding air flow. The tool used in flow simulation is equipped with the frequency analysis procedure that shows the spectrum of the oscillations (pressure) in selected points. This permits to identify the main frequencies and amplitudes of the oscillation. The results show that there are several sub-acoustic frequencies (infrasound) that may produce oscillating forces of up to several hundreds of kilograms per square meter of the wing. The topic is closely related to the safety issues.
机译：使用气流模拟工具，可分析机翼周围空气的振荡。要指出的是，机翼后面和下面的气流以低于或低的声频振荡。这种外部激励可能会与机翼和机身的固有振动频率产生共振，这会产生危险的后果。文章的重点是，起飞时机身振动主要取决于周围气流的变化。流量模拟中使用的工具配备了频率分析程序，该程序可显示选定点的振荡（压力）频谱。这样可以确定振荡的主要频率和幅度。结果表明，存在几种次声频率（次声），它们可能产生高达每平方米机翼数百公斤的振荡力。该主题与安全问题密切相关。

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