Evolution of ultrasonic impulses in chains of spheres using resonant excitation

It is demonstrated that broad-bandwidth ultrasonic signals containing frequency components in excess of 200 kHz can be created in spherical chains using harmonic excitation at 73 kHz. Multiple reflections created a periodic waveform containing both harmonics and sub-harmonics of the original forcing...

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Veröffentlicht in:Europhysics letters 2015-03, Vol.109 (5), p.54002-p1-54002-p5
Hauptverfasser: Hutchins, D. A., Yang, J., Akanji, O., Thomas, P. J., Davies, L. A. J., Freear, S., Harput, S., Saffari, N., Gelat, P.
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Sprache:eng
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Zusammenfassung:It is demonstrated that broad-bandwidth ultrasonic signals containing frequency components in excess of 200 kHz can be created in spherical chains using harmonic excitation at 73 kHz. Multiple reflections created a periodic waveform containing both harmonics and sub-harmonics of the original forcing frequency, due to non-linear Hertzian contact. These discrete frequencies represented some of the many allowed non-linear normal modes of vibration of the whole chain. Excitation at a single fixed frequency could thus be used to produce wide-bandwidth impulses for different lengths of spherical chains. Experimental results were in good agreement with theoretical predictions.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/109/54002