有不连续材料层的组合板结构振动功率流研究

Vibrational power flow analysis on combined plates partially covered layer of discontinuous material

对工程中常用的发生质量和刚度突变或加有粘弹性阻尼材料的组合L形板结构进行了振动功率流研究．应用拉普拉斯变换和迁移矩阵方法得到了板的挠度表达式以及其它的物理量。分析了不连续材料的质量、刚度和自由阻尼层的特性对输入功率流和传递功率流的影响。所得结论为此类结构的优化设计及减振降噪提供了理论依据．

Abstract: Vibrational power flow on combined plates with a change in mass and stiffness or with viscoelastic damping layer used widely in engineering is studied. The expressions of fie-cural displacement and other physical quantities are obtained using Laplace transformation and transfer matrix approach, then influences of changes in mass and stiffness of discontinuous material and the free damping layer on input power flow and transmitted power flow are discussed. The conclusinons provide theory basis for structural optimization design and reducing noise and vibration.