title: Analysis of solitary wave impulses in granular chains using ultrasonic excitation.
abstract: The propagation of broad bandwidth solitary wave impulses, generated within granular chains by narrow bandwidth ultrasonic excitation, is studied in detail. Theoretical predictions are compared to experimental results. It is demonstrated that the observed effects result from a sum of a solitary wave traveling out from the source with a wave that reflects from the far end of the chain. It is shown that this combination, when used with an excitation in the form of a long-duration tone burst, encourages the generation of multiple impulses with a characteristic periodicity. This study shows that the properties of the chain structure and the excitation can be adjusted so as to generate ultrasonic solitary wave impulses with a high amplitude and known frequency content, which are of interest in applications such as biomedical ultrasound.
authors.affiliation: School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
authors.forename: D A
authors.initials: DA
authors.lastname: Hutchins
authors.affiliation: School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
authors.forename: O
authors.initials: O
authors.lastname: Akanji
authors.affiliation: School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
authors.forename: P J
authors.initials: PJ
authors.lastname: Thomas
authors.affiliation: School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
authors.forename: L A J
authors.initials: LA
authors.lastname: Davis
authors.affiliation: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Harput
authors.affiliation: Department of Mechanical Engineering,University College London, Torrington Place, London WC1E 7JE, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Gelat
authors.affiliation: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Freear
authors.affiliation: Department of Mechanical Engineering,University College London, Torrington Place, London WC1E 7JE, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Saffari