Effects of core structure on the performance of Terfenol-D rod

Abstract

To improve the vibration performance of the Terfenol-D rod and make its work more efficient, six types of Terfenol-D rods were studied in this paper. The dynamic simulation analyses of the rods were carried out, and the core loss of the rods were calculated and analyzed. Three structures of rods were manufactured, and their output amplitude were tested. The results showed that an untreated rod had the highest resonance frequency, the largest mechanical quality factor, and the smallest output amplitude and outer surface stress; compared with the untreated rod, the resonant frequency and mechanical quality factor of the sliced and slit rods reduced, the output amplitude and outer surface stress of the sliced and slit rods increased; the resonant frequency and mechanical quality factor of the sliced rods were smaller than those of the slit rods; and the output amplitude and outer surface stress of the sliced rods were larger than those of the slit rods. The untreated rod had the largest core loss on the outer diameter surface; the core loss on the outer diameter surface of the sliced and slit rods reduced, and the core loss of sliced rods was less than that of slit rods. The radially slit rod had the largest overall core loss; the overall core loss of the radially cut and bonded rod and the sliced rods was less than that of the untreated rod and the radially slit rod.