Experiments that are done under microgravity, e.g. during space or parabola flights, are invariably accompanied and affected by ubiquitous vibrations of the surroundings. Vibrations induce Quickly Changing Acceleration Forces (QCAFs) that interfere with the perception of the earth gravitational field. To investigate their impact on experiments under microgravity we monitored the vibrations of the airplane A300 ZERO-G during parabola flights and analyzed them in their spectral and frequency domains. Power spectra obtained with Fast-Fourier Transforms (FFT) display a complex pattern of various vibrations whose origin, relative phases and intensities remain unidentified. During the zero-g phases (parabolas), when the engines of the airplane are throttled, the vibrations still elicit residual QCAFs of at least +/- 1 g. By means of adequate damping procedures the QCAFs could, however, be reduced by approximately 95%.

中文翻译：

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在A300 ZERO-G上快速更改加速力（QCAF）振动分析。

在微重力下进行的实验（例如在太空或抛物线飞行期间）总是伴随着周围无处不在的振动并受到其影响。振动会引起快速变化的加速力（QCAF），从而干扰地球重力场的感知。为了研究它们对微重力实验的影响，我们监测了抛物线飞行中飞机A300 ZERO-G的振动，并在其频谱和频域内对其进行了分析。使用快速傅立叶变换（FFT）获得的功率谱显示出各种振动的复杂模式，其起源，相对相位和强度仍然不确定。在零重力阶段（抛物线），当飞机发动机节气门时，振动仍然会引起至少+/- 1 g的残留QCAF。