Thu 15 Mar 2007
Pioneering the field of computation of electromagnetic fields related to ships, FLUX has become a known and renowned reference in the world. This leadership has a long history: • The partnership developed with the LMN, Laboratoire de Magnétisme du Navire, that has enabled since long time to develop the tools needed for the modelling of this application as well as validation of the results versus measurements. • Xavier Brunotte, the technical manager of CEDRAT has lead its PhD on this application in 1991. The topic was: “Modelling of infinity and account for thin magnetic regions. Application to modelling of ship magnetisation”. • Christophe GUERIN, a major actor on FLUX physical aspects in CEDRAT’s Development Team, has developed the “shell regionsâ€? during its PhD in 1994. The topic was: “Determination of Eddy currents losses in transformer tanks. Modelling of thin regions and account for saturation in magnetic material in harmonic states”.
This leadership is also explained by a long list of advanced technical features, such as:
1/ The Shell region is a major feature for ship magnetisation. It enables to consider the hull as a surface and not as a volume. Considering the difference of dimensions between the length of the structures and the thickness of the hull, this enables to consider much larger structures with high accuracy. The shell region represents the hull as a surface, its thickness being introduced as “virtual thickness” and taken accurately into account. The variation of the field through this thickness is taken into account providing accurate field at the opposite side, whatever the variation of the field.
Example of a source field defined as parametric expression: Axis=1: along X; Axis=2: along Y; Axis=3: along Z.
2/ The parametric application which enables in one file to obtain the results for the 3 directions, using a simple formula. The multi axis model enables to solve for any parametric orientation of the source field. Results are then obtained easily for all directions at any distance of the ship. The formula manager of FLUX enables also to express easily the expression to obtain : Bz, Bz-µ0*H0, …
Simple model: hull considered has a surface with virtual thickeness
|B| induced by a earth field along X axis: influence of boxes and wall of ship
HO in X direction, Z=250mm, Bz.
HO in Y direction Z=250mm, Bz.
HO in Z direction, Z=250 mm, Bz – mu*0*HO.
3/ The infinite box that enables to model the open boundary cases, taking into account the field up to the infinite.
2 degaussing coils, Z=250mm, Bz.
4/ The coil shape data base that enables to describe either parameterized standard coils from database, either any kind of customized shapes of coils. The coils are independent of the mesh. So parametric computations versus their position in the system are extremely easy to obtain.
Part of shell described with nurbs imported on step format from Solidworks and meshed in FLUX.
5/ The advanced imports capabilities and the automatic mesh generator that enables to import DXF, STEP, IGES, PRO-E, CATIA or AUTODESK files.
6/ The 64B solver that will be proposed with V9.3 in spring 2006 will be the last improvement introduced in FLUX. It will bring the capability to consider much larger configuration, the present limit being slightly above 1 000 000 nodes.
Mesh discontinuities of the top of an ellipsoid and connection with surrounding mesh of the air.
7/ The experience and the quality of the support you will benefit from our support team for these applications.
HO in X direction, Z=250mm, Bz along a path placed under the ship, centered in Y.
Some examples are shown in the presented pictures. We remain at disposal for any further information and are ready to bench to enable you to join the community of worldwide navies using FLUX.