板壳结构振动功率流的子结构线导纳法研究

采用子结构点导纳方法分析铺壳耦合结构振动特性时,需要将衔接线划分为一系列的点进行求解,较为烦琐.针对这一问题,该文提出了改进的子结构线导纳方法.首先建立了铺板和圆柱壳的耦合振动模型;然后采用模态展开法分别求解铺板和圆柱壳的机械线导纳,得到振动传递方程中的线导纳矩阵;最后求解耦合振动方程分析铺板与圆柱壳的振动功率流特性.将结果分别与ANSYS 和AutoSEA 的计算结果进行对比分析表明:该文提出的改进方法能够在宽频带内有效地计算板壳耦合结构的振动功率流特性,且求解过程简单,适于线衔接复杂结构的振动特性分析.

A STRUCTURE LINE RECEPTANCE METHOD FOR ANALYSIS OF POWER FLOW IN A CLYLINDRICAL SHELL WITH A FLOOR PARTITION

For the analysis of plate-shell coupled structures,the coupling edges should be divided by lots of points to calculate if the substructure point receptance method is applied,which is inconvenient.To solve this problem,an improved substructure line receptance method is presented here.Firstly,a coupled model of a cylindrical shell with a floor partition is obtained,based on the substructure theory.Secondly,a modal expansion method is utilized to get the line receptance of the cylindrical shell and the floor partition separately.As a result,vibrating velocities of the plate and the shell can be acquired,to calculate the power flows of the system.Eventually,comparison is carried out among the results calculated by substructure line receptance methods,ANSYS and AutoSEA,respectively.It shows that the method presented here is effective to analyze the vibration power flow characteristics of plate-shell coupled structures over a wide frequency range and the calculation process is simpler compared with that of the substructure point mobility method.Thus,this method is especially suitable for complex structures coupled with lines.