玻璃纤维增强塑料夹层板振动能量流可视化研究

为探索复合材料结构在外部激励作用下的振动能量传递及分布特性,基于结构声强法对玻璃纤维增强塑料夹层板的振动能量可视化技术进行了研究。基于结构声强概念,结合复合材料结构层合理论推导了玻璃纤维增强塑料夹层板的结构声强解析表达式;给出了基于有限元数值方法的结构声强可视化计算实现流程,利用Python和Matlab语言编写了相应计算程序;接着从固有频率、振型及结构声强矢量三个方面验证了所提出可视化程序的有效性;以玻璃纤维增强塑料夹层板为例,利用结构声强技术提供的图形信息实现了激励源定位及振动能量传递特性的可视化分析;最后提取了剪切分量、扭转分量和弯曲分量对结构声强矢量的贡献情况,直观展示了剪切分量在振动能量传递过程中的决定性作用。

Vibration energy flow visualization of a glass fiber reinforced plastics sandwich panel

In order to explore the vibration energy flow and distribution characteristics of composite structures under external excitation, the vibration energy visualization technology for a glass fiber reinforced plastic(GFRP) sandwich plate was studied based on the structural intensity method.The structural intensity vectors of the GFRP sandwich plate element were calculated according to the laminate theory based on the concept of structural intensity.The realization process of structural intensity visualization based on finite element method was presented by virtue of the Python and Matlab Language.The calculated natural frequencies, mode shapes and structural intensity vectors were compared with the references to validate the proposed numerical method.The analysis of the GFRP sandwich plate gives an example to show the graphic information of structure intensity field which provides the location of excitation source and the distribution characteristics of vibration energy flow for composite structures.The contributions of the shear component, twist component and bending component to the structural intensity vectors were extracted which intuitively show the dominant role of shear component in the energy transfer of vibration.