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Showing 1 to 20 of 22 for “"Terfenol-D"”.
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A finite element approach for the implementation of magnetostrictive material terfenol-D in automotive CNG fuel injection actuation
… defined for actuation, magnetostrictive material Terfenol-D possesses intrinsic rapid response times while providing small and accurate displacements and high-energy efficiency, which are some of the essential parameters required for fast control of fuel injector valves for decreased engine …
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Estudo de sensor de campo magnético baseado em fibra óptica com rede de Bragg e Filme Fino de Terfenol-D
… with a Bragg grating inscribed and coated with a Terfenol-D magnetostrictive thin film. When an external magnetic field is applied, the magnetostrictive thin film presents a strain that will be transmitted to the optical fiber. The strain will be detected by the displacement of the wavelength …
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Pulsed Laser Deposition of Thin Film Heterostructures
… thin films, multilayer heterostructures of Terfenol-D thin films on polycrystalline Lead Titanate thin films were grown by pulsed laser deposition. By using a novel experimental technique called magnetic field assisted piezoelectric force microscopy it is possible to investigate the …
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Dynamic transduction characterization of magnetostrictive actuators
… dynamics and the constitutive relationships for Terfenol-D characterize the electro-magneto-mechanical interaction. Experimental analysis of a Terfenol-D actuator serves to verify the developed models and provides an indication of actuator non-linearity. The developed transduction model allows …
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Energy absorption in Ni-Mn-Ga/ polymer composites
… of single crystals can be quite costly. Terfenol-D, a commercially available giant-magnetostrictive material, suffers from some of the same drawbacks. It was found that composite materials made from Terfenol-D particles in a polymeric matrix could solve the issue of the brittleness while …
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Magnetostrictive Particle Tagging of Epoxy and Epoxy Composites for Self Assessment of Damage
… mum in size. This thesis focuses on the use of Terfenol-D, a giant magnetostrictive material, for tagging of polymer and polymer matrix composites. Their manufacture and magnetomechanical behavior is assessed using a variety of experimental procedures. The performance of tagged materials for …
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Magnetoelectric laminated composites and devices
… widely used magnetostrictive materials, such as Terfenol-D or nickel ferrite. The experimental results show that Metglas based ME laminates have giant ME voltage coefficients and small required DC magnetic biases. Besides, the laminates have a good directional dependence of the magnetic field: it …
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Magnetostrikční vibrační generátor
… tvořený z nosníku s magnetostrikčním materiálem (Terfenol-D) a cívky. Model tohoto přístroje je vytvářen v prostředí Matlab/Simulink a programu FEMM. Pro různé naměřené hodnoty vibrací jsou poté tyto způsoby porovnávány. V programu FEMM lze zdokonalit získávání energie pomocí modelování různých …
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AN INVESTIGATION OF NOVEL HIGH-SPEED ACTUATORS FOR SOFT PRODUCT ASSEMBLY AND MANIPULATION
… considered was a magnetostrictive material, Terfenol-D. Designed to produce a high deflection from an applied magnetic field the Terfenol-D actuator is a relative newcomer to the field of high-speed actuation. The main test performed on this material is the building of the rig required to …
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A Micromechanics Study on Ferroelectrics and Multiferroic Composites
… the nonlinear magnetoelectric effects of Terfenol-D/PZT/Terfenol-D laminated system under the applied magnetic field. To verify the model, the voltage coefficient 𝛼<sub>E33</sub> of the system is calculated and compared with the experimental data. The comparison between the theory and …
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
… Once both gratings have been attached to the Terfenol-D rods close to each other and subjected to the same temperature variations inside a paper box, the separation of magnetostrictive strain from those related to temperature in the signal of sensor output could be obtained.
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Smart material composites for magnetic field and force sensors
… we focus on two composites systems: ferrite / Terfenol-D / nickel — lead zirconate titanate (magnetoelectric); and lanthanum strontium manganate (LSMO) — carbon nanotube (CNT) – silicon carbonitride (SiCN) (piezoresistive). Recently, Islam et al. have reported a magnetic field sensor based on a …
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Detecção de barras quebradas em motores de indução utilizando sensor magnetostrictivo composto aplicado em redes de Bragg em fibras ópticas
… (FBG) and magnetostrictive composite made of Terfenol-D particulates immersed in epoxy resin matrix applied to induction motor is shown to be capable of detecting rotor broken bars in high voltage induction motors, even when the motor is installed in a dangerous atmosphere, due to the …
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Design and optimization of magnetostrictive actuator
… introduction of active (MS) materials such as Terfenol-D, \nth stable characteristics over a wide range of temperatures and high magnetoelastic properties, interest in MS technology has been growing. Additionally, for products where is a need to control fluid motion by varying the viscosity, a …
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Dynamic actuation properties of Ni-Mn-Ga ferromagnetic shape memory alloys
… coefficient is five times greater than Terfenol-D with d31 = 5.0 x 10-m / A. The magnetic susceptibility varies between 3-10, while the twinning stiffness varies between 30-40 MPa within the average bias stress range of 0.3 to 2.8 MPa. At optimum fields and bias stresses, the mechanical …
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An investigation of electromagnetic rig-generated strong magnetic fields
… strain of annealed cobalt ferrite and Terfenol-D based materials. It was thought that magnetic flux densities of the order 1.6 tesla would be needed in the air-gap. However after carrying out preliminary calculations for the air-core design, it was realized that very high electrical …
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Characterization of Bending Magnetostriction in Iron-Gallium Alloys for Nanowire Sensor Applications
… tensile strengths in conventional alloys such as Terfenol-D. Results show that there is an appreciable sensing response from cantilevered Galfenol beams and that this phenomenon can be accurately modeled with an energy based formulation. For progressing experiments to the nanowire scale, a …
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Framework for a Unified Macroscale Model of Magnetostriction
… the model accurately predicts the behavior of Terfenol-D while two different iron gallium alloys are modeled with varying accuracy. Next, this dissertation attempts to expand the 1D model to two dimensions. This requires numerical approximation techniques which take the form of quadrature …
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Techniques for Controlling Structural Vibrations
… Using a DC motor, piezoelectric ceramics, and Terfenol-D struts as actuators and potentiometers, strain gages, and accelerometers as sensors, we demonstrate successful single- and multi-mode vibration control. In order to realize a more versatile implementation of the control strategy, we …
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Multimaterial Fiber Sensors for Physical Measurements
… center of a magnetostrictive composite made of Terfenol-D and thermoplastic elastomers. The magnetostrictive properties of the composite, using various polymer matrices, were thoroughly investigated. A detailed study of the sensor's response under different boundary conditions and applied …
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