Low threshold subharmonic generation in fractal piezoelectric composites

Author

Alippi, A. ; Shkerdin, G. ; Bettucci, A. ; Craciun, F. ; Molinari, E. ; Petri, A.

Author_Institution

CNR, Istituto di Acustica ´´O.M. Corbino´´, Roma, Italy

fYear

1992

Firstpage

707

Abstract

Subharmonic Lamb modes were observed 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 favorable frequency and spatial matching of coupled localized and extended modes in these structures

Keywords

ceramics; crystal resonators; filled polymers; fractals; harmonic generation; nonlinear acoustics; perturbation theory; piezoelectric oscillations; surface acoustic waves; Lamb modes; composite piezoelectric plates; coupled modes; extended modes; first-order perturbative theory; fractal piezoelectric composites; localized modes; low threshold subharmonic generation; nonlinear effects; self-similar structure; spatial matching; Artificial intelligence; Couplings; Displacement measurement; Electrodes; Fractals; Frequency; Nonlinear optics; Optical interferometry; Optical resonators; Resins;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1992. Proceedings., IEEE 1992

Conference_Location

Tucson, AZ

Print_ISBN

0-7803-0562-0

Type

conf

DOI

10.1109/ULTSYM.1992.275910

Filename

275910