| Issue |
EPL
Volume 109, Number 5, March 2015
|
|
|---|---|---|
| Article Number | 54002 | |
| Number of page(s) | 5 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/109/54002 | |
| Published online | 11 March 2015 | |
Evolution of ultrasonic impulses in chains of spheres using resonant excitation
1 School of Engineering, University of Warwick - Coventry CV4 7AL, UK
2 School of Electronic and Electrical Engineering, University of Leeds - Leeds LS2 9JT, UK
3 Department of Mechanical Engineering, University College London - Torrington Place, London WC1E 7JE, UK
Received: 14 January 2015
Accepted: 20 February 2015
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.
PACS: 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 46.40.-f – Vibrations and mechanical waves / 45.50.-j – Dynamics and kinematics of a particle and a system of particles
© EPLA, 2015
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