中文摘要：

采用有限元软件ANSYS对三闭室复合材料箱型薄壁梁以及复合材料翼型截面薄壁梁进行了模态分析.首先建立了复合材料薄壁梁的有限元模型,然后对这2种不同截面形状的薄壁梁分别进行了模态计算,讨论了铺层角度、长高比、宽高比对三闭室复合材料薄壁箱型梁的模态振型及固有频率的影响,并讨论了铺层角度、长度、铺层数对复合材料薄壁翼型梁的模态振型及固有频率的影响.

英文摘要：

The vibration modes of thin-walled composite beams with three-cell box sec- tion and airfoil section were studied by the finite element software ANSYS. The finite element models were established first for these composite beams, then the vibration modes were calculated and analyzed. The effects of ply angle, length-width ratio and width-height ratio on the modal shape and the natural frequency of the three-cell com- posite thin-walled box beam and the effects of ply angle, length and layer number on the mode shape and the natural frequency of the airfoil composite thin-walled beam were discussed.