FEM result data structure

Contents Functions

7.8 FEM result data structure

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

.def	deformations (NDOF by NDef matrix)
.DOF	DOF definition vector
.data	(optional) matrix of numbers characterizing the content of each deformation (frequency, time step, ...)
.opt	options
.fun	function description [Model Analysis Field FieldType Format NDV]. This is based on the UNV 55 format detailed below.
.lab	(optional) cell array of strings characterizing the content of each deformation.
.LabFcn	(optional) string to be interpreted defining the label of each channel using local variable ch (number of the channel currently displayed in feplot). For example 'sprintf(''t=%.2f ms'',def.data(ch)*1000)'
.label	string describing the content
.scale	(optional) string describing the content

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.