| Based on the dynamic finite element techniques, the behaviour of semidiscretized wavepropagation solutions has been received attention. Throught a series of derivations, the dis persive equation is got, with it, the graphs are drawn. lt shows that the dispersive error has a great relation ship with not only the mesh layout, but also the element mass distributions and the propagation directions. It also gives the accuracy and efficiency of the dynamic finite element method compared with the conventional one. |