Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275910
