Determine best set of mode shapes by minimizing off-diagonal terms in self-orthogonality or self-MAC matrix.
[s_fm,ms,meq] = modesort(st,Ott,align,minsort,niter)
MODESORT sorts and ranks mode shapes by minimizing the number of off-diagonal values in the orthogonality matrix. It is assumed that two or more mode shapes are repeated if their corresponding coupling term is above ALIGN.
The MODESORT routine:
st |
Mode shape imat_shp object. |
Ott |
Orthogonality, MAC (, or any) [nmodes by nmodes] matrix corresponding to ST. |
align | Scalar value between 0 and 100. Any two modes with an off-diagonal in the Orthogonality Matrix above align are assumed to be the same mode shape. |
minsort |
Specifies the minimum number of off-diagonal terms that MODESORT will minimize. |
niter | Number of different starting points in algorithm. |
s_fm |
Modeshape substructure containing final set of modes. |
ms |
Map of modes in ST that are contained in S_FM (s_fm = st(ms));. |
meq | Orthogonality/MAC Matrix of S_FM. |
>> st=readadf % Import Mode Shapes
>> [MACtt]=ortho(st,st); % Run the ortho command (with or without a mass substructure)
>> align=80; minsort=15; % Set align = 80% and minsort = 15%
>> NITER=10; % Specify number of iterations
>> [s_fm,ms,meq] = modesort(st,MACtt,align,minsort,NITER); % Run MODESORT
ortho, readadf