Drgania giętne, nieliniowe belki pod działaniem obciążeń stochastycznych poprzecznych i wzdłużnych

In this work the mechanical systems where exist nonlinear elasticity and inertia, subjected to stochastic loadings in the form of external force and parametric excitation are considered. The procedure of calculating spectral density function in the second order approximation is presented in general case. The influences of nonlinear terms and parametric excitation on responses of the mechanical systems is investigated in special cases.