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30 March 2006 Smart magnetic materials and magnetoresistive sensors in controlling of mechanical structures
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Smart Magnetic Materials (SMM) play growing role in materials science and applications. Due to variety of subjects connected with SMM we have confined ourselves to magnetorheological fluids (MRF), magnetorheological composites (MRC), Giant Magnetostrictive Materials (GMM) and Magnetovision Camera using MR sensors. The MRC used for tests was created by soaking porous material with Magnetorheological Fluid. The experimental set-up used for applying, acquisition, processing mechanical and magnetic signals is shown. Total influence of magnetic field H and amplitude of deformation on damping in tested MRC is presented. Examples of application are discussed. In the second part tests of GMM were performed for rare earth elements alloy (Terfenol-D). High effectiveness in transforming magnetic energy into mechanical one (actuator) as well as mechanical into magnetic (sensor) requires experimental determination and identification. Original stand used in research allowed to fix mechanical and magnetic loads, measurement of signals and signal processing. Exemplary results of model identification comprising own experimental data are presented. The next part of study was aimed at designing a system for measuring the strength of magnetic field surrounding a ferromagnetic specimen subjected to cyclic (or static) loading. A new type of camera for monitoring the magnetic picture of specimen and others objects was constructed. The measurement principle is based on the reverse magnetostriction effect (also called the Villari effect). No external magnetizing field is assumed. The measuring set-up is made up a precision computer controlled X-Y positioner and a basis unit whose main element is a single magnetoresistor or an array of magnetoresistors.
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Jerzy Kaleta, Jacek M. Bomba, Daniel Lewandowski, and Przemysław Wiewiórski "Smart magnetic materials and magnetoresistive sensors in controlling of mechanical structures", Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61670W (30 March 2006);

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