shp2TAM


Purpose

Create a TAM matrix from mode shapes

Syntax

TAM = shp2TAM(SG,DOF,START_NODE)

Description

SHP2TAM creates the TAM matrix to be used in back expansion. It builds the constraint matrix from the mode shapes. The primary use envisioned for this function is to transform modal coordinates to physical:

% {dof} = [PHI] * {q}

%

DOF is an imat_ctrace containing the DOF to which to expand.

SG is an imat_shp containing the mode shapes to use to create the back expansion matrix. The vector {q} in the equation above are the modal coordinates associated with the shapes SG.

START_NODE is the starting node number used to define the modal coordinates. They are assumed to be in increasing order, and tagged with an X direction.

TAM is a structure containing the following fields:

.aset Modal coordinate DOF (inputs to the back expansion)
.oset Output DOF
.constraint Back expansion matrix: SG{DOF}

 

See also

backexp, shp2TAMexp