Piezo-damping of light structures: modelling and experimental results

摘要

By including piezo-materials into a light structure, it is possible to convert a part of its vibrational energy into electrical energy. If this electrical energy is addressed to a dissipative impedance, a damping effect is obtained. This paper presents, from modelling results, the performance improvement obtained when the dissipative impedance includes either a negative capacity in order to cancel the capacity of the used piezo-ceramics, or a resonant electrical circuit tuned to the mechanical frequency to be damped. It is shown how the obtained performances are related to a non-dimensional coupling factor between the used piezo-materials and the structure to be damped.