The purpose of this paper is to investigate experimental responses of a preloaded vibroimpact Hertzian contact to an order 2 superharmonic excitation. A test rig is used, corresponding to a double sphere–plane contact preloaded by the weight of a moving body. Typical response curves are obtained under the superharmonic excitation. The Hertzian nonlinearity constitutes the precursor of vibroimpacts established over a wide frequency range. This behavior can be related to the existence of a transcritical bifurcation. In conjuction with the experiments, numerical results lead to the same conclusion. In particular, the threshold level of the excitation necessary to induce vibroimpact is confirmed.
Superharmonic Resonance of Order 2 for an Impacting Hertzian Contact Oscillator: Theory and Experiments
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Perret-Liaudet, J., and Rigaud, E. (December 21, 2006). "Superharmonic Resonance of Order 2 for an Impacting Hertzian Contact Oscillator: Theory and Experiments." ASME. J. Comput. Nonlinear Dynam. April 2007; 2(2): 190–196. https://doi.org/10.1115/1.2447549
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