| 1. |
- Bergqvist, A., et al.
(författare)
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A phenomenological differential #x2010;relation #x2010;based vector hysteresis model
- 1994
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 75, s. 5484-5486
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Tidskriftsartikel (refereegranskat)abstract
- A phenomenological inherently vector hysteresis model employing simple differentials as a means of keeping track of the past history of the magnetic field is proposed. This results in a simple and computationally fairly efficient formulation for vector hysteresis of any dimension. An expression for determining model parameters from experimental data or from the Preisach function is given. The model exhibits rotational hysteresis and reduction of remanent magnetization by an orthogonal field and reduces to the classical Preisach model in one dimension. Details concerning the numerical implementation are discussed and computational examples demonstrating model properties are presented.
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| 2. |
- Bergqvist, A., et al.
(författare)
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A phenomenological magnetomechanical hysteresis model
- 1994
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 75:10, s. 5496-5498
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Tidskriftsartikel (refereegranskat)abstract
- To obtain accurate design tools for applications involving giant magnetostrictive materials, magnetomechanical hysteresis effects should be taken into account. The problem consists of determining the magnetization and mechanical strain from the combined past history of magnetic field and mechanical stress. In this work, coupled magnetomechanical hysteresis has been modeled by using simple path #x2010;dependent differentials to accumulate the past history in functions related to the magnetization and strain through material #x2010;dependent parameters. By using anhysteretic curves and a few additional parameters to characterize a material, major, and minor loops with respect to both field and stress have been calculated for Terfenol #x2010;D and have shown good agreement with experiments.
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| 3. |
- Bergqvist, A., et al.
(författare)
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A stress-dependent magnetic Preisach hysteresis model
- 1991
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Ingår i: IEEE transactions on magnetics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9464 .- 1941-0069. ; 27, s. 4796-4798
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Tidskriftsartikel (refereegranskat)abstract
- The authors present a generalization of the classical Preisach model which handles coupled magnetic and mechanical hysteresis. Magnetostrictive materials are known to have hysteresis with respect to both magnetic field H and mechanical stress lambda;. To test the validity of the model, experiments where the two components H and lambda; have been verified in many different ways have been performed on Terfenol-D and compared to results computed from the model. Some of these results are presented. This stress-dependent model is found to have an accuracy comparable to that of the classical Preisach model
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| 4. |
- Bergqvist, A., et al.
(författare)
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Application of a vector Preisach model in a magnetic circuit
- 1993
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 73, s. 5839-5841
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic hysteresis effects have been included in a finite #x2010;element description of a magnetic circuit by using the classical vector Preisach model for the constitutive relation between H and B. The influence of an external electric circuit is taken into account by adding equations derived from Faraday #x2019;s law. Computational results are presented for a magnetic circuit used in a magnetostrictive device.
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| 5. |
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| 6. |
- Engdahl, Göran
(författare)
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Flextensional Transducers Based on Terfenol-D
- 1992
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Ingår i: International Symposium on Giant Magnetostrictive Materials and their Applications, November 5-6, 1992, Tokyo, Japan.
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Konferensbidrag (refereegranskat)
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| 7. |
- Engdahl, Göran
(författare)
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Modelling of Highly Magnetostrictive Materials
- 1992
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Ingår i: International Symposium on Giant Magnetostrictive Materials and their Applications, November 5-6, 1992, Tokyo, Japan.
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Konferensbidrag (refereegranskat)
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| 8. |
- Kvarnsjo, L., et al.
(författare)
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A method of measuring eddy current impedances in giant magnetostrictive materials
- 1990
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Ingår i: IEEE transactions on magnetics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9464 .- 1941-0069. ; 26, s. 2574-2576
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Tidskriftsartikel (refereegranskat)abstract
- A method of calculating eddy-current impedances for giant magnetostrictive materials during dynamic magnetization is suggested. The method is based on solving the power-balance equation for each time step of the recorded data. The experimentally obtained impedances can be used for accurately modeling the magnetostrictive process
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| 9. |
- Kvarnsjo, L., et al.
(författare)
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Application of a stress-dependent magnetic Preisach hysteresis model on a simulation model for Terfenol-D
- 1992
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Ingår i: IEEE transactions on magnetics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9464 .- 1941-0069. ; 28, s. 2623-2625
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Tidskriftsartikel (refereegranskat)abstract
- A previously reported simulation model for the highly magnetorestrictive material. Terfenol-D has been extended by implementation of the recently developed stress-dependent magnetic Preisach hysteresis model. The model is based on static measurements of material characteristics combined with equations for the dynamic mechanical and magnetic behavior of the material. As a test of the model the authors have simulated the behavior of a Terfenol-D rod for different load conditions. The results show that the model is able to describe the influence of nonlinearities, eddy currents, and hysteresis on the magnetomechanical transduction process of magnetorestrictive materials
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| 10. |
- Kvarnsjo, L., et al.
(författare)
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Examination of eddy current influence on the behavior of a giant magnetostrictive functional unit
- 1990
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 67, s. 5010-5012
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Tidskriftsartikel (refereegranskat)abstract
- Current simulation models for the magnetoelastic behavior of giant magnetostrictive materials have been successfully used in designing low #x2010;frequency functional units based on magnetostrictive effects. At higher frequencies, however, the precision of these models decreases due to eddy currents inside the material. In a specially designed setup, a functional unit was electrically feeded with sinusoidal currents of different amplitudes and frequencies and mechanically loaded with different mechanical forces. The experimental data obtained were used in an extended simulation model able to include eddy current effects into the magnetomechanical process. The extended model has been verified experimentally for sinusoidal magnetizations at different frequencies and mechanical loads. A comparison between this experimentally extended model and a corresponding analytically extended model is also done. The comparison gives an indication of the interaction between mechanical stresses and magnetic field penetration inside the magnetostrictive material.
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