Nomenclature

Abstract: The paper reveals recent developments of the influence of the geometric imperfections on the phase angle of the non-linear vibrations of thin rectangular plates parametrically excited. In the region of principal parametric resonance, starting from the temporal non-linear differential equation that describes the oscillatory movement and using the second order approximation of the asymptotic method was computed the phase angle as function of system parameters and geometric imperfections. By varying the intensity of the geometric imperfections was obtained their influence upon the phase angle for the stationary non-linear dynamic response. Key-Words: Non-linear dynamics of plate