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为了有效地提取含间隙可展结构振动信号中所包含的动力学特征量,在分析传统Fourier方法局限性的基础上,引入基于小波变换的数据处理和分析方法。对含间隙太阳能帆板在收拢和展开状态下施加单脉冲的激励,测试标志点的加速度信号,系统地分析了间隙对动力学性能的影响。结果表明:小波变换能够较好地表征含间隙可展结构的时频特征信息,可以得到系统的频带以及各个频度衰减的速度和时间。实现了对航天可展结构动力学性能在时频域内的“精细”考察,将有助于提高航天器结构的分析与设计水平。
In order to extract the dynamic features contained in the vibration signals of the space-span expandable structure effectively, the method of data processing and analysis based on wavelet transform is introduced based on the analysis of the limitations of the traditional Fourier method. A single pulse excitation was applied to the solar panel with gap, and the acceleration signals of the test points were tested. The influence of the clearance on the dynamic performance was systematically analyzed. The results show that the wavelet transform can characterize the time-frequency feature information of the space-spanable structure well and get the frequency band of the system and the decay speed and time of each frequency. The “fine” investigation of the dynamic performance of the spacecraft structure in the time-frequency domain is achieved, which will help to improve the analysis and design of the spacecraft structure.