嵌入式共固化复合材料阻尼结构的动力学性能

Dynamic Performance of Embedded and Co-cured Composite Damping Structure

为大幅度提高嵌入式共固化复合材料阻尼结构的动力学性能,基于有限元的模态应变能法探讨了边界条件对单层连续阻尼结构和多层连续阻尼结构阻尼性能的影响,同时对一短边固支的单层连续阻尼结构模态损耗因子随阻尼层厚度变化的规律进行了研究。结果表明:对比探讨的其它边界约束条件,四边固支的嵌入式共固化阻尼复合材料结构具有较好的力学性能;增加单边固支连续阻尼结构中阻尼层的厚度可促使结构的模态损耗因子增大;当阻尼层较薄时,模态损耗因子随着阻尼层厚度的增加增幅较大,阻尼层厚度较厚时,模态损耗因子对结构阻尼层的变化不再敏感。

In order to improve the dynamics of the embedded co-cured composite damping structure significantly,the influence of boundary condition on the damping performance of single-layer and multi-layer continuous damping structure was analyzed by modal strain energy finite element method.At the same time,the loss factor of the single-layer continuous damping structure with a short-edge fixed was studied under different damping layer thicknesses.The results show that the high rigidity and high damping performance are obtained for the embedded and co-cured damping composite structure when the four sides are fixed.No matter how the fixed conditions change,the modal loss factor and the natural frequency of the multi-layer continuous damping structure are larger than those of the single-layer continuous damping structure.As the thickness of the damping layer of the single-layer continuous damping structure increases,the modal loss factor increases.When the damping layer is thin,the modal loss factor is sensitive to the change of the thickness of the damping layer.When the thickness of the damping layer is thick,the change of damping layer thickness has less effect on the modal loss factor.