FEM result data structure

SDT-base Contents Functions

7.8 FEM result data structure

Deformations resulting from finite element computations (fe_eig, fe_load, …) are described by def structures with fields

.def	deformations (NDOF by NDef matrix)
.DOF	DOF definition vector, note that the .tdof field is used for responses at sensors and the .dof field for input/output pairs
.data	(optional) (N_Def by N_info vector or matrix) characterizing the content of each deformation (frequency, time step, ...)

.Xlab	(optional) {'DOF',{'Freq';'Index'}} cell array describing the columns of data.
.defL	(optional) displacement field corresponding to the left eigenvectors obtained from fe_ceig.
.fun	(optional) function description [Model Analysis Field FieldType Format NDV]. This is based on the UNV 55 format detailed below. Typically field with [0 fe_curve('TypeAnalysis')]. This field is needed for proper automated display setup.
.lab	(optional) cell array of strings characterizing the content of each deformation (columns of .def). For large arrays, the use of a .LabFcn is preferable.
.ImWrite	(optional) can be used to control automated multiple figure generation, see iicom ImWrite.
.LabFcn	callback for label generation see fecom LabFcn
.Legend	data for legend generation, see fecom Legend
.label	(optional) string describing the content
.DofLab	optional cell array of strings specifying a label for each DOF. This is used for display in iiplot.

.scale	field used by feplot to store scaling information.

The .fun field is a numeric row with values (a typical value for static responses is def.fun=[0 1 0])

Model (0 Unknown, 1 Structural, 2 Heat Transfer, 3 Fluid Flow)
Analysis see list with fe_curve('TypeAnalysis')
Field see list with 0: Unknown (or general SDT), 1: Scalar, 2: Tx Ty Tz, 3: Tx Ty Tz Rx Ry Rz, 4: Sxx Sxy Syy Sxz Syz Szz, 5: Sxx Syx Szx Sxy Syy Szy Sxz Syz Szz
FieldType see list with fe_curve('typefield')
Format 0 default, 2 Real, 5 Complex
NDV Number Of Data Values Per Node (0 for variable number)

SDT provides a number of utilities to manipulate deformation structures. In particular you should use

def=fe_def('subdef',def,ind) extracts some deformations (columns of def.def). You can select based on the data field, for example with ind=def.data(:,1)>100.
def=fe_def('AppendDef',def,def1) combines two sets of deformations
def=fe_def('SubDof',def,DOF) extracts some DOF (rows of def.def). To select based on DOF indices, use def=fe_def('SubDofInd',def,ind).
def=feutilb('placeindof',DOF,def) is similar but DOF may be larger than def.DOF.
fe_def('SubDofInd-Cell',def,ind_dof,ind_def) return clean display of deformation as a cell array.