Akanji, O;
Yang, J;
Hutchins, D;
Thomas, P;
Davis, LA;
Harput, S;
Freear, S;
... Saffari, N; + view all
(2016)
The Effect of Boundary Conditions on Resonant Ultrasonic Spherical Chains.
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
, 63
(11)
pp. 1957-1966.
10.1109/TUFFC.2016.2576563.
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Abstract
The response of a resonant chain of spheres to changes in holder material and pre-compression is studied at ultrasonic frequencies. The system is found to be very sensitive to these parameters, with the creation of impulsive waveforms from a narrow bandwidth input seen only for certain chain lengths and holder materials. In addition, careful experiments were performed using known amounts of pre-compression force, using a calibrated stylus arrangement. At negligible pre-compression levels, impulses were generated within the chain, which were then suppressed by increased pre-compression. This was accompanied by large changes in propagation velocity as the system gradually changes from being strongly nonlinear to being more linear. Simulations using a discrete model for the motion of each sphere agree well with experimental data.
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