复合材料层合板在动集中力作用下的结构声强特性

Structural Intensity Characterization of Laminated Composite Plates Subjected to Dynamic Concentrated Force

本文研究了复合材料正交异性层合板在动集中力作用下的结构声强特性。应用MSC/-NASTRAN商业软件计算了复合材料正交异性层合板在动集中力作用下各单元的内力和速度,再应用MATLAB软件得出复合材料层合板的结构声强。算例表明,复合材料正交异性层合板的结构声强流线图与各向同性板存在明显不同的特性。复合材料正交异性层合板的结构声强流线图受边界条件、层合板叠层顺序和层数的影响。从结构声强向量图和流线图可获得关于能量传递路径、源位置和能量汇合点的许多信息。进一步,结构振动产生的噪声可根据上述信息加以控制。

The structural intensity characterization of laminated composite plates subjected to dynamic concentrated force was discussed. The resultant forces and velocities of the laminated composite plates were calculated by using the commercial software MSC/-NASTRAN, and the structural intensity in laminated composite plates was evaluated by using software MATLAB. The structural intensities for laminated composite plates and the isotropic plates were analyzed and discussed. From present results, it can be demonstrated that the structural intensity streamlines of laminated composite plates are different from that of isotropic plates, and the structural intensity streamlines of laminated composite plates are influenced by the boundaries, the stacking sequence and the layers of laminated composite plates. The energy flow path, the energy flow sources and sinks of laminated composite plates can be identified for different loading cases and boundary conditions. From this structural intensity streamline and structural intensity vector presentation, the positions of source and sink of energy flow can be further used to control and attenuate the noise level of the structure.