The paper proposes a technique for calculating dynamic deformation of the axisymmetric orthotropic shells of revolution shells based on solving differential equations by the finite difference method. In particular, it uses the polyharmonic radial basis functions to solve the adjoin problem of the tank insignificant oscillations with the ideal incompressible fluid generating the local finite difference weight coefficients on an arbitrary stencil of the computational domain nodal points. The axisymmetric shell meridian deformation is described by a system of six differential motion equations obtained on the basis of general spatial equations for resolving functions in the global coordinate system. To describe rotations, the final rotation vector (Eulerian vector) is used. Equations do not contain the initial curvature; they describe large rotations, displacements and deformations and take into account thinning/thickening and influence of the transverse shear in the thick shell deformation. The proposed technique is implemented in the proprietary DARSYS software package. Oscillation frequencies of the liquid tanks are calculated using the proposed technique and are compared with frequencies obtained by the other methods. To analyze convergence, the ANSYS system is used, as well as a program that implements the finite and boundary element methods.

EDN VKBZET