双环可展桁架结构动力学分析与试验研究

基于广义逆矩阵方法分析双环可展桁架的运动过程,通过数值仿真,得出双环可展桁架在展开过程中的各个状态.经过对比分析可知,对于大口径天线,双环可展桁架的刚度可以比同口径单环可展桁架明显增加.利用上述仿真程序输出的几何模型,进一步对50m双环可展桁架原型建立有限元模型,并进行展开过程中各状态的振动模态分析.对2m天线试验样机采取悬挂法消除重力影响并进行振动模态试验,且将其与有限元计算结果对比,结果表明两者的频率较为接近,验证了有限元动力学分析的正确性.

Dynamic analysis and test research of double-ring deployable truss structure

The moving process of the double-ring deployable space truss was analyzed with the Moore-Penrose generalized inverse matrix method,and each state of the double-ring deployable space truss in the deploying process was obtained by numerical simulation.Comparative analysis shows that,for large caliber antennas,the stiffness of the double-ring deployable truss is obviously stronger than that of the common single-ring deployable truss with the same caliber.With the geometrical models of the deployable truss prototype,which were output by the above-mentioned simulation program,finete element models of 50 m deployable truss were established,and also the dynamic vibration during the deploying process of the double-ring deployable truss was analyzed.Vibration test was carried out on the 2 m test modal of the double-ring deployable truss by suspension,in order to eliminate the influence of the gravity’s effect.In addition,the result of the test was contrasted with that of the finite element analysis of the double-ring deployable truss,finding out that two of them were approximately the same,to make verification to finite element dynamic analysis.