A homogenized energy model was implemented in a model-based nonlinear control design to accurately track a reference displacement signal for high frequency magnetostrictive actuator applications. Rate dependent nonlinear and hysteretic magnetostrictive constitutive behavior is incorporated into the finite-dimensional optimal control design to improve control at high frequency. The integration o...

A laser-based magnet measurement system has been developed to measure the magnetostrictive strain of large cylindrical samples. The measurement system incorporates a solenoid capable of generating a maximum magnetic field intensity of 3000 Oe and a laser displacement sensor. For calibration and evaluation purposes, the positive magnetostrictions of two different types of giant magnetostrictive ...

Magnetostrictive transducers are commonly used as actuators and sonar transducers, in remote non-destructive evaluation. Their use wireless thermometry is relatively unexplored. Since magnetostriction-based sensors passive, they could potentially enable long-term near-field thermometry. While the temperature sensitivity of resonance frequency magnetostrictive has been reported previous studies,...

In this research, a control feedback system is used to study the free vibration response of rectangular plate made of magnetostrictive material (MsM) for the first time. A new trigonometric higher order shear deformation plate theory are utilized and the results of them are compared with two theories in order to clarify their accuracy and errors. Pasternak foundation is selected to modelling of...

Gd5(SixGe1-x)4 has a complex magnetic-structural phase diagram which can be divided into three distinct regions. I t exhibits an unusual first order coupled magnetic-structural phase transition in the region 0.41 ≤ x ≤ 0.51. A series of magnetostrictive strain measurements were carried out as a function of magnetic field strength at different temperatures and as a function of temperature at nea...

PURPOSE The effects of magnetostrictive and piezoelectric devices on tooth surfaces seem to differ with regard to the root surface roughness they produce. This study aimed to compare the results of scaling using magnetostrictive and piezoelectric devices on extracted teeth. METHODS Forty-four human extracted teeth were assigned to four study groups (n=11). In two groups (C100 and C200), the t...

TbFe2 film prepared by a flash evaporation system onto Si(100) or polyamide substrate have been irradiated with different Ar ion doses at zero, 1.3x10 and 2.7x10 ions/cm and at 10 kV. Magnetostrictive properties of TbFe2 film with disordered structure, saturated magnetostriction and magnetostrictive susceptibility, improved by Ar ion beam irradiation due to increasing of in-plane compressive st...

In this paper, we propose a model for dynamic magnetostrictive hysteresis in a thin rod actuator. We derive two equations that represent magnetic and mechanical dynamic equilibrium. Our model results from an application of the energy balance principle. It is a dynamic model as it accounts for inertial effects and mechanical dissipation as the actuator deforms, and also eddycurrent losses in the...

This paper presents a process for fabricating diaphragms, suitable for use in micromachined pumps within the field of micro-fluidics. To enable the actuation of a thick-film deposited magnetostrictive material, actuation coils are fabricated onto the non-chamber face of the diaphragms. These actuation coils are fabricated using a multilayer deposition approach compatible with micromachining pro...