shp2TAMexp


Purpose

Calculate back expansion matrix based on FEM shapes

Syntax

TAMOUT = shp2TAMexp(SG,TAM,NODES)

Description

SHP2TAMEXP uses the SEREP method to create a back expansion matrix for a TAM. The back-expansion matrix is calculated using the below equation, where OSET are unmeasured DOF in NODES. More shapes lead to better estimates of the TAM.

TAM.constraint = sg{TAM.oset}*pinv(sg{TAM.aset})

SG is an imat_shp containing the mode shapes to use to create the back expansion matrix.

TAM is a strcuture containing the input TAM matrix. At minimum it must contain a .aset field, which contains the ASET degrees of freedom as an imat_ctrace.

NODES is a vector containing the nodes in the Test Display Model that are also part of the analysis shapes SG.

TAMOUT is a structure containing the estimated TAM back-expansion matrix. It contains at minimum the fields:

.aset Modal coordinate DOF (inputs to the back expansion)
.oset Back-expanded DOF
.constraint Back expansion matrix

 

See also

backexp, shp2TAM