连接界面不定性对于加筋板结构振动能量传递特性的影响分析

摘要

It is of great importance to predict the vibration energy transmission (structure-borne sound transmission)within rib-stiffened plate structures due to their large applications in practical engineering.Since ribs usually were taken as junctions between plates,here parameter uncertainty effects of stiffening beams (ribs)on the power transmission between coupled thin plates were studied based on a plate-beam-plate model.Considering the significant dynamic features'mismatches between the ribs and plates,the hybrid FE-SEA method was adopted for simulations. Numerical investigations showed that the variations of stiffness and boundaries of ribs have relatively bigger effects on the vibration energy transmission of ribs-stiffened plate structures than the variations of material properties and interface coupling DOFs do.%加筋板结构有着极为广泛的工程应用，准确预测振动能量（结构声）在加筋板中的传递特性是对于工程结构进行有效、合理声学设计的一个极为重要的环节。本文以板－筋－板组合系统为研究对象，将加强筋视为板件结构的中间连接件，通过仿真分析计算，研究了加筋板的参数不确定性对筋板组合系统的功率流传递特性影响。考虑到加强筋与所连接板件通常具有较大的动态特性差异，仿真模拟以中频混合分析法（Hybrid FE-SEA method）为主。研究表明：在长短波并存的中频域，加筋板中的结构声传递特性受加强筋刚度和边界条件变化的影响较大，而受其材料属性和连接自由度数量变化的影响较小。