The dynamic excitation of a granular chain for biomedical ultrasound applications: contact mechanics finite element analysis and validation

Journal article

Gelat, P., Yang, J., Thomas, P.J., Hutchins, D.A., Akanji, O., Davis, L.A.J., Freear, S., Harput, S. and Saffari, N. (2016). The dynamic excitation of a granular chain for biomedical ultrasound applications: contact mechanics finite element analysis and validation. Journal of Physics: Conference Series. 684 (1). https://doi.org/10.1088/1742-6596/684/1/012005
AuthorsGelat, P., Yang, J., Thomas, P.J., Hutchins, D.A., Akanji, O., Davis, L.A.J., Freear, S., Harput, S. and Saffari, N.
Abstract

There has been recent interest in the transmission of acoustic signals along granular chains of spherical beads to produce waveforms of relevance to biomedical ultrasound applications. Hertzian contact between adjacent beads can introduce different harmonic content into the signal as it propagates. This transduction mechanism has the potential to be of use in both diagnostic and therapeutic ultrasound applications, and is the object of the study presented here. Although discrete dynamics models of this behaviour exist, a more comprehensive solution must be sought if changes in shape and deformation of individual beads are to be considered. Thus, the finite element method was used to investigate the dynamics of a granular chain of six, 1 mm diameter chrome steel spherical beads excited at one end using a sinusoidal displacement signal at 73 kHz. Output from this model was compared with the solution provided by the discrete dynamics model, and good overall agreement obtained. In addition, it was able to resolve the complex dynamics of the granular chain, including the multiple collisions which occur. It was demonstrated that under dynamic excitation conditions, the inability of discrete mechanics models to account for elastic deformation of the beads when these lose contact, could lead to discrepancies with experimental observations.

Year2016
JournalJournal of Physics: Conference Series
Journal citation684 (1)
PublisherIOP Publishing
Digital Object Identifier (DOI)https://doi.org/10.1088/1742-6596/684/1/012005
Web address (URL)https://iopscience.iop.org/article/10.1088/1742-6596/684/1/012005
Publication dates
Online05 Feb 2016
Publication process dates
Accepted05 Jan 2016
Submitted13 Aug 2019
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Open
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Harput, S., Nie, L., Cowell, D.M.J., Carpenter, T., Raiton, B., McLaughlan, J. and Freear, S. (2016). Simultaneous trapping and imaging of microbubbles at clinically relevant flow rates. 2016 IEEE International Ultrasonics Symposium (IUS). Tours, France 18 - 21 Sep 2016 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ULTSYM.2016.7728393
Coupling of wideband impulses generated by granular chains into liquids for biomedical applications
Harput, S., Freear, S., Gelat, P., Saffari, N., Yang, J., Akanji, O., Thomas, P.J. and Hutchins, D.A. (2016). Coupling of wideband impulses generated by granular chains into liquids for biomedical applications. 2016 IEEE International Ultrasonics Symposium (IUS). Tours, France 18 - 21 Sep 2016 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ULTSYM.2016.7728481
Spatial Resolution and Contrast Enhancement in Photoacoustic Imaging with Filter Delay Multiply and Sum Beamforming Technique
Alshaya, A., Harput, S., Moubark, A.M., Cowell, D.M.J., McLaughlan, J. and Freear, S. (2016). Spatial Resolution and Contrast Enhancement in Photoacoustic Imaging with Filter Delay Multiply and Sum Beamforming Technique. 2016 IEEE International Ultrasonics Symposium (IUS). Tours, France 18 - 21 Sep 2016 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ULTSYM.2016.7728682
Specimen-agnostic guided wave inspection using recursive feedback
Adams, C., Harput, S., Cowell, D., Freear, S. and Charutz, D.M. (2016). Specimen-agnostic guided wave inspection using recursive feedback. 2016 IEEE International Ultrasonics Symposium (IUS). Tours, France 18 - 21 Sep 2016 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ULTSYM.2016.7728811
The Effect of Boundary Conditions on Resonant Ultrasonic Spherical Chains
Akanji, O, Yang, J., Hutchins, D., Thomas, P.J., Davis, L.A.J., Harput, S., Freear, S., Gelat, P.N. and Saffari, N. (2016). The Effect of Boundary Conditions on Resonant Ultrasonic Spherical Chains. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 63 (11), pp. 1957-1966. https://doi.org/10.1109/TUFFC.2016.2576563
An adaptive array excitation scheme for the unidirectional enhancement of guided waves
Adams, C., Harput, S., Cowell, D., Carpenter, T.M., Charutz, D.M. and Freear, S. (2016). An adaptive array excitation scheme for the unidirectional enhancement of guided waves. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 64 (2), pp. 441-451. https://doi.org/10.1109/TUFFC.2016.2628100
Contrast-enhanced ultrasound imaging with chirps: Signal processing and pulse compression
Harput, S., McLaughlan, J., Cowell, D. and Freear, S. (2015). Contrast-enhanced ultrasound imaging with chirps: Signal processing and pulse compression. 2015 IEEE International Ultrasonics Symposium (IUS). Taipei, Taiwan 21 Oct - 24 Nov 2015 https://doi.org/10.1109/ULTSYM.2015.0160
Ultrasonic propagation in finite-length granular chains
Hutchins, D.A., Yang, J., Akanji, O., Thomas, P.J., Davis, L.A.J., Freear, S., Harput, S., Saffari, N. and Gelat, P. (2015). Ultrasonic propagation in finite-length granular chains. Ultrasonics. 69, pp. 215-223. https://doi.org/10.1016/j.ultras.2015.10.018
Superharmonic imaging with chirp coded excitation: filtering spectrally overlapped harmonics
Harput, S., McLaughlan, J. and Cowell, D. M. J. (2014). Superharmonic imaging with chirp coded excitation: filtering spectrally overlapped harmonics. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 61 (11), pp. 1802-1814. https://doi.org/10.1109/TUFFC.2014.006424
Ultrasonic Phased Array Device for Acoustic Imaging in Air
Harput, S. and Bozkurt, A. (2008). Ultrasonic Phased Array Device for Acoustic Imaging in Air. IEEE Sensors Journal. 8 (11), pp. 1755 - 1762. https://doi.org/10.1109/JSEN.2008.2004574