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(a) Experimental setup for torsional modal testing with the proposed magnetostrictive patch transducer, (b) the configuration of the proposed transducer and the biasing magnetic flux flowing through ferromagnetic patches from the permanent magnets.
Magnetostrictive transducers used for ultrasonic torsional wave experiments. (a) A configuration (Ref. 10) using a premagnetized magnetostrictive strip and (b) a configuration using an obliquely bonded magnetostrictive strip (Ref. 11).
(a) Measured input current at the excitation point, point 16, and the voltage at the sensing point, point 3; (b) frequency response functions obtained by the proposed testing method.
Normalized torsional eigenmodes of a cylinder with free end supports (circles: experimental results, lines: theoretical results). MAC denotes the modal assurance criterion value between the corresponding experimental and theoretical modes.
Voltage output signals. (a) The effects of the patch width and (b) the effects of the patch gap on the measured output voltage signals.
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