The spacecraft with large flexible space structures may be subject to the thermally induced vibration (TIV) due to the rapidly changed solar heat flux when it enters and leaves the eclipse, which would lead to certain spacecraft failure. This paper reports a laboratory experiment that aims to study the impact of transient characteristics of heat flux on the ground experiment of TIV. In the experiments on the TIV of a slender thin-walled beam, two different methods of providing transient heat flux were considered, and the process of entering and leaving eclipse was simulated, respectively. The experimental results demonstrate that different transient characteristics of heat flux will have large impact on the TIV of the specimen, and the ideal theoretical estimation of thermal characteristic time has limitations in practical engineering. In addition, it is found that the traditional way of simulating solar heat flux by turning on/off infrared heat lamps is not suitable for the TIV ground experiment. Instead, a transient heat flux simulation method by moving the baffle is recommended.

中文翻译：

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细长薄壁梁热激振动热通量特性的实验研究

具有较大柔性空间结构的航天器在进入和离开日食时，由于太阳热通量的快速变化，可能会受到热致振动（TIV）的影响，从而导致某些航天器故障。本文报道了一个实验室实验，旨在研究热通量瞬态特性对TIV地面实验的影响。在细长薄壁梁的TIV实验中，考虑了两种不同的瞬态热通量提供方法，分别模拟了进出蚀过程。实验结果表明，不同的热通量瞬态特性会对试件的TIV产生较大影响，热特性时间的理想理论估计在实际工程中存在局限性。此外，研究发现，传统的通过打开/关闭红外加热灯来模拟太阳热通量的方式不适用于TIV地面实验。相反，建议使用通过移动挡板的瞬态热通量模拟方法。