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The magneto-mechanical damping (MMD) in Terfenol-D is investigated by measuring the resonance vibration spectra of Terfenol-D bar. It is observed that MMD in Terfenol-D strongly depends on DC magnetic field (Hdc), and the ratio of the maximum variation of MMD over Hdc to the MMD at zero bias field achieves ~255%. Taking advantage of this MMD dependence on Hdc, a coil-less DC magnetic field sensor...
An energy harvester is presented to convert ambient mechanical vibration into electrical energy. The harvester consists of a cantilever beam, a magnetic circuit and a magnetostrictive/piezoelectric laminate magnetoelectric (ME) transducer. The magnetic circuit is arranged on the free end of the beam and produces a concentrated flux gradient. When the harvester is excited, the magnetic circuit moves...
A smart concrete module with embedded PZT ceramic element is proposed to monitor the health of the structure. Being embedded, the PZT ceramic is in a complicate environment which results in the changes of physical properties of PZT element. In this paper, a new method of measuring energy losses is first proposed to evaluate the effect of such physical changes. In order to measure the energy losses,...
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