梁结构的高频响应研究

利用NASTRAN软件得到一简支梁从低频到高频的频响特性，研究了不同有限元网格划分 对结构高频特性的影响，并通过统计能量分析(SEA)法、有限元法以及解析解的对比揭示了S EA法在高频响应 预示中的有效性。然后以耦合梁为例，通过有限元法得到两个梁之间的能量传递，并进而得 到SEA所需的耦合损耗因子；将有限元计算结果和SEA结果对比验证了该方法的有效性，以期 建立一种用有限元法获得SEA参数的新途径。此外，研究了集中质量和不同边界条件对耦合 结构高频能量传递的影响。

High-Frequency Response Research of Beam Structure

The high-frequency response characters of a simple-sup po rted beam is obtained by NASTRAN. The result is strongly influenced by the mesh size. The comparison based on FEM, SEA and the closed form solution reveals th e effectiveness of SEA in the prediction of high-frequency response. Next, the energy transmission between two coupled beams is obtained through FEM, and then the CLF used by SEA is built. The method is verified through the comparison bet ween FEM and SEA in order to establish a new method which get the SEA parameter by FEM. Last, the effects of concentrated mass and boundary condition are consi dered. Subject Term Finite element method Beam structure Response High frequency Statistical energy analysis