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Evolution of ultrasonic impulses in chains of spheres using resonant excitation

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Hutchins, David A., Yang, J., Akanji, Omololu, Thomas, P. J. (Peter J.), Davies, L. A. J., Freear, Steven, Harput, Sevan, Saffari, Nader‏ and Gelat, Pierre (2015) Evolution of ultrasonic impulses in chains of spheres using resonant excitation. EPL (Europhysics Letters) , 109 (5). Article number 54002. doi:10.1209/0295-5075/109/54002

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Official URL: http://dx.doi.org/10.1209/0295-5075/109/54002

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Abstract

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.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Wave mechanics, Waves, Sound-waves, Vibration
Journal or Publication Title: EPL (Europhysics Letters)
Publisher: E D P Sciences
ISSN: 0295-5075
Official Date: 10 March 2015
Dates:
DateEvent
10 March 2015Published
9 April 2015Available
20 February 2015Accepted
14 January 2015Submitted
Volume: 109
Number: 5
Article Number: Article number 54002
DOI: 10.1209/0295-5075/109/54002
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Description:

Erratum to this article : Erratum: Evolution of ultrasonic impulses in chains of spheres using resonant excitation doi:10.1209/0295-5075/109/59903

Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/K030159/1

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