We present a study of the effects of geometric nonlinearities on vibrations of rotating machines support structures. Dynamic characteristics of structures depend on their stiffness and mass. The initial stiffness of a structure, computed in its unloaded state, is affected by the applied forces, the so-called geometric stiffness. In bases of machines excited by the supported equipment, vibrations may affect the structures but, in general, may generate damage to the suspended equipment and the quality of the production. Here we study these effects via theoretical, numerical and experimental methods. The model is a metal beam under pretension supporting a rotational machine. The presence of large axial compressive force will reduce the beam stiffness and natural frequencies that may lead to unexpected potentially dangerous resonance states.
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