Mechanical APDL Structural Analysis Guide

• The output control option for the first load step is printed output (OUTPR). Use this option to
  control printout of the nodal solution.

6. Specify loads and load step options for the transient loading portion.

• General options include the following:


• Time Option (TIME)

This option specifies time at the end of the load step.

• Stepped or Ramped Loads (KBC)

This option indicat es whether to ramp the load change over the load step (KBC) or to step-

apply the load change (KBC,1). The default is ramped.

• Output control options include the following:
  
  
  • Printed Output (OUTPR)
  
  
  
  

Use this option to control printed output.

• Database and Results File Output (OUTRES)

This option controls the data on the reduced displacement file.

The only valid label on these commands is NSOL (nodal solution).The default for OUTRES

is to write the solution for every fourth time-point to the reduced displacement file (unless

there are gap conditions defined, in which case the default is to write every solution). If you

expanded element results during the modal analysis, then OUTRES is not applicable as the

modal coordinates and not the displacements are written to Jobname.RDSP.

7. By default, if you used the Block Lanczos, PCG Lanczos, Supernode, or Subspace option for the
   modal analysis (MODOPT,LANB; LANPCG; SNODE; or SUBSP), the modal coordinates (the factors to
   multiply each mode by) are written to the file Jobname.RDSP and no output controls apply. If
   however you explicitly request not to write the element results to the .MODE file (MXPAND,,,,,,NO),
   the actual nodal displacements are written to the .RDSP file. In that case, you may use a nodal
   component with the OUTRES,NSOL command to limit the displacement data written to the reduced
   displacement file Jobname.RFRQ. The expansion pass will only produce valid results for those
   nodes and for those elements in which all of the nodes of the elements have been written to the
   .RFRQ file. T o use this option, first suppress all writing by invoking OUTRES,NSOL,NONE, then
   specify the item(s) of interest by invoking OUTRES,NSOL,FREQ,component. Repeat the OUTRES
   command for any additional nodal components that you want to write to the .RDSP file. Only one
   output frequency is allowed. ( The program uses the last frequency specified by OUTRES.)


8. Save a backup copy of the database to a named file.
   Command(s):SAVE
   GUI: Utility Menu> File> Save as


9. Leave SOLUTION.
   Command(s):FINISH
   GUI:Close the Solution menu.

As an alternative method of resolution, you can issue the LSWRITE command to write each load step
to a load step file (Jobname.S01) and then issue LSSOLVE to start the transient solution.

Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information

Performing a Mode-Superposition Transient Dynamic Analysis