6.12 NASTRAN DMAP routines
The viscoelastic vibration toolbox is distributed with a set of NASTRAN DMAP and sample files that are used to implement some solutions steps within the NASTRAN environment. The following parameters are used in those DMAP
| ViNset |
number of sets defining the element selections |
| ViOut |
type of desired output. 0 returns the full matrices of the linear combination. 1 returns a first order reduced model. |
| ViSet1 |
ID for the first set. Sets are assumed to be written
in sequential order. |
| ViIOSET |
ID for set containing the list of nodes that need to be saved for input/output calculations. |
| ViShift |
Frequency shift used to handle cases with rigid body modes. By default the shift is the complex double precision number 10. |
fo_by_set
The objective of this DMAP (fo_by_set.dmp associated with sample job file vfirst_step12.dat) and the associated fevisco WriteStep12 and BuildStep12 commands is to generate a first order reduction of a model were parameters are coefficients on the stiffness matrix of elements within a given selection (NASTRAN set).
nas_sdtserv
This is used to overload basic SDT functionality through NASTRAN calls. You must first set local preferences
setpref('SDT','ExternalEig', ... % Callback used by fe_eig method 50
'mode=fevisco(''nastran eig'',m,k,model.DOF,opt,model,Case);');
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