Mechanical APDL Structural Analysis Guide

Because a linear perturbation analysis can be understood as an extra iteration of the base analysis, all history-dependent resul ...

Random vibration analysis The deformed mesh due to the prior static or full transient analysis is used in the linear perturbat ...

9.3.1. Generating and Controlling Mechanical Loads The total perturbed loads are calculated as follows:
 =  +  ...

reference temperature used in the linear perturbation is the TREF temperature from the base analysis. See Loads, Initial Conditi ...

CORIOLIS -- Used for including Coriolis effects in the modal analysis when the base analysis is static. 9.5. Considerations for ...

Example input to perform perturbed modal solve in a rotating reference frame: /solution antype, static! Static analysis nlgeom, ...

real,3 nsel,r,loc,x,1 esurf allsel vsel,s,volu,,2 allsel,below,volu type,4 real,3 nsel,r,loc,x,1 esurf allsel ! ** Displacement ...

nsel,all prrfor finish Example 9.2: Simple Example of a Linear Perturbation Modal Analysis /prep7 mp,ex,1,10! Simple material mp ...

allsel,all etable,seqv,s,eqv pretab,seqv finish Example 9.3: Linear Perturbation Modal Analysis with Large Rotation Effects *afu ...

/solu /com First phase of linear perturbation antype,static,restart,,,perturb! Restart from the last substep of the rigid rotati ...

lmesh,all allsel,all et,3,169 lsel,s,line,,1 type,3 real,2 esurf,,reverse lmesh,all allsel,all !** Boundary Condition ** nsel,s, ...

/post1 file,,rstp set,list /cycexpand,,on set,1,5! Use the 5th mode, Harmonic Index = 0 to see solution esel,s,type,,2 /com, *** ...

/com, ************************************************************ presol,cont,stat! Expected contact status: Sticking esel,all ...

real,5 e,1003,node(lp,-lp,0) !*********** Put springs on UY ********** et,6,14 keyopt,6,2,2 r,6,k1 et,7,14 keyopt,7,2,2 r,7,k2 t ...

qrdopt,yes! Allow reuse of QRDAMP Lanczos modes later cmrot,contact2,0.0,0.0,1.9! Apply rotational velocity along rotZ solve,elf ...

/solu antype,static,restart,,,perturb! Restart the linear base analysis perturb,buckle,,,allkeep! This is a LP eigen-buckling an ...

/com, The CENTER option is used /com, /com, Expected load factor = -1.868 /com, predicted Fbuckling = -100-1.868*300 = -660.4 /c ...

k,1,0,0,0! Create model and mesh it k,2,4,0,0 l,1,2 lesize,1,,,4 lmesh,all allsel,all nsel,s,loc,x,0 d,all,all,0! Fix end of bea ...

!! End of linear perturbation based MSUP harmonic /post26 n1=node(4,0,0) nsol,2,n1,u,y rforce,3,1,f,y,fy1 prcplx,1 /com,******** ...

Linear Perturbation Modal Analysis VM53 - Vibration of a String Under Tension VM54 - Vibration of a Rotating Cantilever Blade VM ...