摘要
基于傅里叶(Fourier)温度单元及Boley理论,分析了不同条件下某大型柔性空间结构(LFSS)的热致振动情况,发现改变悬吊杆长度、配重总质量以及背景温度均会影响结构振动幅值和准静态变形之比,但背景热流的影响更大,且其对降低结构的热特征时间有明显作用。入射热流的改变对结构热致振动无明显作用,仅能够改变结构的振动幅值和准静态变形。以上研究结果可有助于改进航天器LFSS结构设计,避免出现在轨热致振动现象。
Based on the Fourier temperature cell and the Boley theory,thermally-induced vibration of a large flexible space truss(LFSS)is analysed,and it is found that the ratio of the structure vibration magnitude to the quasi-static deformation could be affected by the change of the length of the suspending tube,appending mass and ambient temperature.Among these,the effect of the ambient temperature would be the most marked,and the thermal characteristic time is reduced obviously.Otherwise,the change of the incidence heat flux can affect the structure vibration magnitude and the quasi-static deformation,but has less influence on the thermally-induced vibration.The above results can help improve the LFSS design,and avoid the thermally-induced vibration.
引文
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