Frequencies and modes of free oscillation of loaded hose (pipeline) in gas or liquid stream

Algorithm for estimation of eigenvalues and eigenvectors of the rubbercord hose being under action of gas or liquid is presented. Displacements of the hose axial line points and the turn angles of coupled axes are large due to aero-hydrodynamic forces acting on the hose, hence the hose equilibrium is described by nonlinear equations. Equations of small free oscillation of the pipeline are given with allowance for a static stress-strain state. Eigenvalues and eigenvectors are determined by a precise numerical method.