加劲板BEM—FEM耦联动力分析

Dynamic Analysis of Stiffened Plates Using BEM-FEM

将加劲极分为薄板和结合梁（格栅）两部分，薄板部分用无奇点边界元法（ＢＥＭ）处理，而格栅用有限元法（ＦＥＭ）处理，分别建立各自的方程，然后根据板与梁之间的平衡和协调条件加以耦合，导出加劲板的自振特征方程，从而求解各阶频率和振型．本方法适于任意形状、任意边界条件的加劲板，且精度良好．

The thin plate component in a stiffened plate structure is analyzed by nonsingularity BEM,and the grid component in the structure is treated by FEM,Thus,two sets of equations can be obtained and the coupling equations are founded compatibly.Finally, the natural frequencies and the modes of vibration can be calculated. The mehod is suitable for arbitrary form and arbitrary boundary conditions and is easy for programming.