卫星结构蜂窝夹层板的等效计算

Equivalent Analysis of Honeycomb Sandwich Plates for Satellite Structure

在利用 MSC/NASTRAN对卫星结构进行有限元计算时 ,必须对蜂窝夹层板进行预先的等效处理 ,等效处理的合理与否将直接影响到计算结果的可信度 .为此 ,研究了 3种不同的等效方法 ,即三明治夹心板理论、蜂窝板理论以及等效板理论 ,其中三明治夹心板理论方法只对蜂窝夹芯进行等效 ,而蜂窝板理论和等效板理论方法则是对整个蜂窝夹层板进行等效 .分别采用这 3种等效方法 ,对某铝蜂窝夹层板的 2种工况进行了模态分析 ,并将计算结果进行了比较 .结果表明 ,运用等效方法的计算结果非常接近于解析解 。

The honeycomb sandwich panels have been widely used in the satellite structures, and the equivalent elastic constants for the sandwich panels directly influence the accuracy of computational results. Three equivalent methods based on sandwich plate theory, honeycomb plate and equivalent plate theory were derived and analyzed by numerical comparisons. Only the core is equivalent when using the sandwich plate theory while the whole honeycomb sandwich panel is equivalent when using the honeycomb plate and equivalent plate theory. By using the above three equivalent methods the natural frequencies of a honeycomb sandwich panel including two load cases were calculated. The computational results show that all of the three equivalent methods are reliable and practical in the finite element analysis of satellite structures.