Piezo-damping Of Light Structures: Modelling And Experimental Results
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By including piezomaterials 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. Piezo-damping is applied to a blade for isostatic mount of satellite equipment and experimental results are presented.