SDT 6.1

SDT 6.1

August 2008

Key features of the SDT 6.1 release are

Significant extensions, optimization and robustness enhancements for iiplot and feplot property editors.
Major extensions of the superelement capabilities with optimized full and partial restitution for models with millions of nodes.
Significant refinement and robustness enhancement for sensors: improved matching, detailed visualization, ...
Extensions of the support tools state-space model building for active structures, see section 6.6.
Performance enhancement on the handling of large models.

Key features of FEMLink 3.4 are

nasread, naswrite have undergone further speed optimization, support for property conversion has been extended.
abaqus has been extended and optimized. This release is the first to introduce a mechanism for ODB export to an SDT readable format.
ans2sdt .cdb support has been extended. Robustness modifications were performed for ANSYS 11 compatibility.
samcef import/export capabilities have been optimized.

OpenFEM has undergone many detail improvements and the following revisions

model manipulations in feutil and fe_mknl have been optimized for very large models.
field at node definitions are now much more consistenly implemented and sforwarded to element level computations. This capability is used for general shell, thermoelasticity or to support fully anistropic properties defined by fields.
element functions have been been extended for a better automated support of user defined problem formulations. 2D volumes and boundaries now work consistently and were applied to 2D heat diffusion problems (see ofdemos AnnularHeat).

Compatibility

SDT 6.1 is compatible with MATLAB 6.5 to 2008b. Currently compiled platforms are Windows (32 & 64), Linux (32 & 64) and MacOS. For earlier releases, see details
Release notes can be found in the documentation http://www.sdtools.com/help/rel61.html.
For installation procedures see www.sdtools.com/faq/Release.html.

Function with significant extensions

fe2ss	support for Rayleigh damping specification. Support state display in feplot.
feplot, fecom	Optimized loading and colordata operations. Improved robustness of the property figure (multiple sensor, boundary condition selection, rapid selection of groups, materials and properties shown, simple delete of stack entries, ...). Improved the robustness of selection cursors (use context menu Cursor:Stack.
	Support of partial restitution of superelements. Selections now support a -linface to allow animations without use of the mid-side nodes of quadratic elements.
	Improved Stack and CStack operations with multi-level name based indexing and regular expressions.
fe_coor	major optimization for the handling of models in the 1e6 DOF range.
fe_cyclic	support of periodic rather than cyclic solutions. Major extensions of the cyclic symmetry capabilities are under way be will be distributed as a SDT-Rotor module.
fe_mknl,fe_case	assembly operations have been optimized for large models in both memory use and speed. The definition of a model.Dbfile can be used to allow off-load to a database.
fesuper	major optimization of superelement assembly and introduction of partial restitution mechanisms. Extension of feplot to support on the fly partial restitution.
feutil	major performance enhancements for large model handling. These apply to selection mechanisms, lin2quad transformation.
q4cs	speed optimization.
fe_sens	significant robustness enhancements in SensMatch and all sensor related commands. See section 4.3.
fe_simul	introduces optimized assembly, more consistent consideration of damping, ...
iiplot, idcom	significant robustness and performance optimization. Cursor linking abscissa and deformation shown in feplot.
ii_mmif	major extensions of signal processing capabilities integrated in the iicom GUI, see section 2.1.6.
v_handle	support for variable handles stored in HDF5 .mat files has been introduced. This is the basis for fecom load-hdf, which loads minimal information into feplot, and model.Dbfile support.