Do you have a very simple example of CMS superelements used in a modal analysis?
Yes, here is an input file that compares a full modal solution with a CMS superelement modal solution: /prep7 et,1,4 r,1,.1,.01,.02,.1,.1 mp,ex,1,1e7 mp,nuxy,1,.3 mp,dens,1,.0003 n,1 n,2,10 n,3,20 n,4,,1 ! orientation node e,1,2,4 e,2,3,4 fini save !!! Solve without superelement for comparison /solu antype,modal modop,lanb,5 mxpand,5 d,1,all,0 solve fini resu /filn,S_E /solu antype,substr seopt,S_E,2 ! stiffness and mass matrices cmsopt,fix,3 ! use 3 modes to characterize dynamic behavior of S.E. m,2,all ! node 2 is the interface between superelement and model esel,s,,,2 nsle solve save fini /prep7 allsel edele,2 ! this element represented by superelement et,2,matrix50 type,2 se,S_E ! read in superelement fini /solu antype,modal modop,lanb,5 mxpand,5 d,1,all,0 solve fini 

