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High-frequency torsional modal testing of a long cylinder by magnetostriction
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

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).

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-frequency torsional modal testing of a long cylinder by magnetostriction