R\'{e}sonance 2-surharmonique d'un contact unilat\'{e}ral hertzien : approches th\'{e}orique et exp\'{e}rimentale

For a preloaded impact oscillator under superharmonic excitation of order 2, the Hertzian non linearity constitutes the precursor of vibroimpacts established over a wide frequency range. The theoretical study is performed by using the shooting method with an arc length continuation. Experimental results obtained from a devoted test rig agree with theoretical ones. Particularly, the threeshold level of the excitation necessary to induce vibroimpacts is confirmed.