THE MODAL ANALYSIS OF 3D COMPLEX BODIES

Abstract

This article describes a simple method for the modal analysis of 3D complex bodies using Matlab program package, because in practice there are cases where the development of some computer programs for the modal analysis of 3D complex bodies is required, especially with new materials. This paper describes the way to create such a program. The modal analysis represents the first step in the dynamic analysis of a structure, in the case that for the dynamic analysis the modal superposition is used. In this article the tetrahedron element having 3 dynamic degrees of freedom on the node and 12 dynamic degrees of freedom on the element is used for the modeling of 3D complex bodies.