Field measurement to understand the physics of vibroimpact for damping application
Résumé
Vibro-impact absorbers are known to be effective on a wide range of frequencies thanks to their non-linear behaviour and in harsh environment, but they are difficult to model and study experimentally and numerically. Different assumptions emerge to explain energy dissipation such as material and contact effects, or dynamic energy transfers. As classical vibratory measurement tools do not allow to accurately and easily measure what happens in the contact area and the motion of the absorber, it is difficult to validate and quantify the phenomena. The purpose of the study is to take advantage of full field measurements of the vibro-impacts phenomena to better understand the interactions occurring during impact. To reach this objective, a method involving Digital Image Correlation and a high-speed camera is used to capture and reconstruct the motion of the oscillating mass. Experimental results are used to investigate a conceptual modelling of the vibro-impact phenomenon with a coefficient of restitution.
