Ultrasonic propagation in finite-length granular chains

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Title: Ultrasonic propagation in finite-length granular chains
Authors: Hutchins, DA
Yang, J
Akanji, O
Thomas, PJ
Davis, LA
Freear, S
Harput, S
Saffari, N
Gelat, P
Item Type: Journal Article
Abstract: A narrowband ultrasound source has been used to generate solitary wave impulses in finite-length chains of spheres. Once the input signal is of sufficient amplitude, both harmonics and sub-harmonics of the input frequency can be generated as non-linear normal modes of the system, allowing a train of impulses to be established from a sinusoidal input. The characteristics of the response have been studied as a function of the physical properties of the chain, the input waveform and the level of static pre-compression. The results agree with the predictions of a theoretical model, based on a set of discrete dynamic equations for the spheres for finite-length chains. Impulses are only created for very small pre-compression forces of the order of 0.01 N, where strongly non-linear behaviour is expected.
Issue Date: 2-Nov-2015
Date of Acceptance: 19-Oct-2015
URI: http://hdl.handle.net/10044/1/41955
DOI: http://dx.doi.org/10.1016/j.ultras.2015.10.018
ISSN: 1874-9968
Publisher: Elsevier
Start Page: 215
End Page: 223
Journal / Book Title: Ultrasonics
Volume: 69
Copyright Statement: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Acoustics
0203 Classical Physics
0913 Mechanical Engineering
0912 Materials Engineering
Publication Status: Published
Appears in Collections:Bioengineering



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