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首页> 外文期刊>Mechanical systems and signal processing >Time-frequency analysis of nonstationary vibration signals for deployable structures by using the constant-Q nonstationary gabor transform
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Time-frequency analysis of nonstationary vibration signals for deployable structures by using the constant-Q nonstationary gabor transform

机译：常数Q非平稳gabor变换用于可展开结构非平稳振动信号的时频分析。

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摘要

Deployable structures have been widely used in on-orbit servicing spacecrafts, and the vibration properties of such structures have become increasingly important in the aerospace industry. The constant-Q nonstationary Gabor transform (CQ-NSGT) is introduced in this paper to accurately evaluate the variation in the frequency and amplitude of vibration signals along with time. First, an example signal is constructed on the basis of the vibration properties of deployable structures and is processed by the short-time Fourier transform, Wigner-Ville distribution, Hilbert-Huang transform, and CQ-NSGT. Results show that time and frequency resolutions are simultaneously fine only by employing CQ-NSGT. Subsequently, a zero padding operation is conducted to correct the calculation error at the end of the transform results. Finally, a set of experimental devices is constructed. The vibration signal of the experimental mode is processed by CQ-NSGT. On this basis, the experimental signal properties are discussed. This time-frequency method may be useful for formulating the dynamics for complex deployable structures.
机译：可展开结构已经广泛用于在轨维修航天器，并且这种结构的振动特性在航空航天工业中变得越来越重要。本文介绍了恒定Q非平稳Gabor变换（CQ-NSGT），以准确评估振动信号的频率和幅度随时间的变化。首先，根据可部署结构的振动特性构造示例信号，并通过短时傅立叶变换，Wigner-Ville分布，Hilbert-Huang变换和CQ-NSGT对其进行处理。结果表明，仅通过使用CQ-NSGT，时间和频率分辨率才能同时获得良好的显示效果。随后，执行零填充操作以校正变换结果结束时的计算误差。最后，构建了一组实验设备。实验模式的振动信号由CQ-NSGT处理。在此基础上，讨论了实验信号的性质。这种时频方法对于制定复杂的可展开结构的动力学可能很有用。

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