Natural angular frequencies and eigenmodes of orthotropic rectangular parallelepiped with sliding boundary conditions for all faces

Natural angular frequencies and natural vibration modes of the three-dimensional orthotropic rectangular parallelepiped that is not made layers are investigated. The eigenmodes calculated as eigenvalues eigenvectors frequency equation derived from relationship between stress strain in x-, y- z-axes, equations motion admissible functions displacements. In numerical examples, we investigate a material an isotropic material. dimensions frequencies, there three ranges where vary linearly, they almost constant intermediate range them regardless type materials. case material, two were same only linearly. All changed unchanged other always one dominant component eigenvectors, while sometimes two.