Searched for: subject%3A%22Ferromagnetism%22
(1 - 7 of 7)
document
Vijn, A. (author), Peet, B.J. (author), Schaaphok, M. (author), Lepelaars, E. (author), Heemink, A. (author)
This paper presents a hybrid model to estimate the magnetic behaviour of a ferromagnetic structure. The mathematical-physical model has been developed using the Method of Moments combined with a hysteresis model. The mathematical model was derived by a linearisation of the hysteresis curve. The initial magnetic state of a ferromagnetic object is...
article 2022
document
Vijn, A.R.P.J. (author), Baas, O. (author), Lepelaars, E.S.A.M. (author)
The purpose of this article is to estimate the parameters of the Jiles-Atherton hysteresis model, based on minor-loop measurement data in weak applied fields. The well-known hysteresis model by Jiles and Atherton serves as a basis of this article with an extension for the closure of minor loops. In order to represent minor loops correctly, a...
article 2020
document
van der Horst, M.P. (author), Kaminski, M.L. (author), Lepelaars, E.S.A.M. (author)
Growing applications of high strength steels, which are more sensitive to fatigue, harsher operative environments, and increasing economic value of ship- And offshore structures, such as FPSOs and FLNGs, increase the need for asset integrity management systems. Presently, there are many nondestructive testing methods available. Magnetic methods...
conference paper 2014
document
Naus, H.W.L. (author)
The Jiles-Atherton effective field theory of ferromagnetic hysteresis is consistently extended to describe the magnetomechanical effect. Whereas Jiles has proposed two such models, one for constant stress and a different one for varying stress, our formalism includes both situations. It is also possible to simultaneously vary applied field and...
article 2011
document
TNO Industrie en Techniek (author), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Ellenbroek, R.M.L. (author), Verhaegen, M. (author), Doelman, N.J. (author)
In the design of a large adaptive deformable membrane mirror, variable reluctance actuators are used. These consist of a closed magnetic circuit in which a strong permanent magnet provides a static magnetic force on a ferromagnetic core which is suspended in a membrane. By applying a current through the coil which is situated around the magnet,...
conference paper 2006
document
TNO Industrie en Techniek (author), Hamelinck, R.F.M.M. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), Doelman, N.J. (author)
The first prototype of an actuator for a new adaptive deformable mirror (DM) is presented together with the development of a 61-actuator grid element. The DM design consists of a thin membrane which acts as the correcting element. A grid of low voltage electro-magnetic push-pull actuators, impose out-of-plane displacements in the mirror's...
conference paper 2005
document
Naus, H.W.L. (author), TNO Fysisch en Elektronisch Laboratorium (author)
The Jiles-Atherton model of the behavior of ferromagnetic materials determines the irreversible magnetization from the effective field by using a differential equation. This paper presents an exact, analytical solution to the equation, one displaying hysteresis. The inclusion of magnetomechanical couplings for various forms of the...
article 2002
Searched for: subject%3A%22Ferromagnetism%22
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