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tansient analysis in ansys+un convergence

tansient analysis in ansys+un convergence

tansient analysis in ansys+un convergence

(OP)
Dear,all
I want to do a transient analysis with ansys.
time duration: 3400s
But I get unconvergence problem after 40 or 50 second with 0.1 time increment and 600 second with 5 time increment (time step)

What is the problem or how can I guess the problem?

(I want to do a run-up analysis for a rotor with bearing is modeled with comb14)
!!!!
/solu
/out,blackpage
antype,4                   ! transient analysis
nlgeom,on                  ! Turn on Large Deformation Effects
solcontrol,on,on         
kbc,0                      ! stepped BC's
rescontrol,,none           ! Do not keep any restart files
trnopt,full,,,,,nmk        ! HHT time integration method
tintp,0.1               ! Numerical Damping
nodeUnb = node(0.6,0,0)
f,nodeUnb,fz,%fzTab%   !jahat check shavad
f,nodeUnb,fy,%fyTab%   !jahat check shavad
CNVTOL,F,1
CNVTOL,M,1
CNVTOL,U,1

autots,off                 ! User turned off automatic time stepping
deltim,5,5,5
time,3400.
timint,on                  ! Turn on time integration effects
nldiag,nrre,1
coriolis,on,,,on
omega,spin
!----------------------------------
! specify results file requirements
!----------------------------------
outres,all,none
outres,nsol,25
outres,misc,1
!------------------------------------
! Solve commands
!------------------------------------
solve                               



for time step:5s

           
  Time= 600.00 Load Step= 1 Substep= 120 Equilibrium Iteration= 22.      
    F Convergence Norm= 0.12595E-01  Previous Norm= 0.14467E-01
    U Convergence Norm= 0.29992E-06  Previous Norm= 0.34449E-06
    M Convergence Norm= 0.26145E-10  Previous Norm= 0.29682E-10
     FORCE CONVERGENCE VALUE  = 0.1097E-01  CRITERION= 0.5000E-02
     MOMENT CONVERGENCE VALUE = 0.2247E-10  CRITERION= 0.5000E-02 <<< CONVERGED
    Writing NEWTON-RAPHSON residual forces to file: file.nr002
 curEqn=  28322  totEqn=  28322 Job CP sec=   2182.407
      Factor Done= 101% Factor Wall sec=      0.377 rate= 3830.7 Mflops
 curEqn=  28322  totEqn=  28322 Job CP sec=   2182.407
      Factor Done= 101% Factor Wall sec=      0.000 rate=    0.0 Mflops
     DISP CONVERGENCE VALUE   = 0.2611E-06  CRITERION= 0.5000E-02 <<< CONVERGED
    EQUIL ITER  22 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.5837E-08
     FORCE CONVERGENCE VALUE  = 0.9547E-02  CRITERION= 0.5000E-02
     MOMENT CONVERGENCE VALUE = 0.1988E-10  CRITERION= 0.5000E-02 <<< CONVERGED
    Writing NEWTON-RAPHSON residual forces to file: file.nr003

 

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