We observed subharmonic Lamb modes in composite piezoelectric plates with self-similar structure. The thresholds for their generation are very low as compared to those of homogeneous or periodical plates with comparable acoustical and electrical parameters. In the frame of a first order perturbative theory, this can be explained in terms of the unusually favourable frequency and spatial matching of coupled localized and extended modes in these structures.
Low threshold for subharmonic generation in fractal piezoelectric composites / Alippi, Adriano; G., Shkerdin; Bettucci, Andrea; F., Craciun; E., Molinari; A., Petri. - STAMPA. - (1992), pp. 707-710. (Intervento presentato al convegno 1992 IEEE Ultrasonic Symposium tenutosi a Tucson, AZ, USA) [10.1109/ULTSYM.1992.275910].
Low threshold for subharmonic generation in fractal piezoelectric composites
ALIPPI, Adriano
;BETTUCCI, Andrea;
1992
Abstract
We observed subharmonic Lamb modes in composite piezoelectric plates with self-similar structure. The thresholds for their generation are very low as compared to those of homogeneous or periodical plates with comparable acoustical and electrical parameters. In the frame of a first order perturbative theory, this can be explained in terms of the unusually favourable frequency and spatial matching of coupled localized and extended modes in these structures.| File | Dimensione | Formato | |
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