Abstract
In this paper are studies the vibrations which appears when an obstacle is surpassed with one side wheels or with all four wheels, and the bonet is considerated as a thin flat plate with a large curvature.
It is proposed a sinusoidal shape obstacle, by known height and width,for which are determinated the verticale desplacements at the suspended mass in this two cases.
Finally, it is building a mathematical model and the dynamic answer of bonnets vibrations for the reminded cases is found by solving this mathematical model.