Does someone have the guidelines (Setp by Step) to input the requried data to perform a modal analysis ?? I already finished the static analysis, but I want to know what is the system natural frequency so I understand modal analysis under dynamic module must be run.
If an example (File) can be attached to your answer I would really appreciated
Thanks

Read the Caesar II User Guide.

mag,

A bit more specifically, read the CaesarII User Guide (c2ug.pdf) pages 8-6 thru 8-10 plus page 8-44 (pages 218 thru 222, plus 256 of the PDF.)

It's there with desciptions and screenshots of steps and explanations.
Let us know that you understand modal analysis after reading and running the modal analysis of your piping system. See the results for natural frequencies, and then decide if you have problems or not.

hi MAG
*go to ANALYSIS->DYNAMIC ANALYSIS->ANALYSIS TYPE->"SELECT MODAL"
*IN CONTROL PARAMETERS->CLICK SETTING AND CHOOSE ANY OF THE LOAD CASE U HAVE BUILD
* NOW RUN THE ANALYSIS
*CAESAR II DYNAMIC OUTPUT WINDOW OPENS, SELECT NATURAL FREQUENCY AND VIEW REPORT

How about the Mass? i think it will have a different output when you specified the mass on the piping system (Where in dynamic analysis in CAESAR consider it as Lumped Mass) and when you don't specify it....

By default the "mass" of the piping system will be automatically accounted for by CAESAR II in the dynamic analysis.

The "Lumped Mass / Consistent Mass" switch controls the numerics of how the "mass matrix" is computed. The "mass" at the nodes is still the same, regardless of the setting of this switch.

Yes i read that, but is the 3.214 lbm automatically put by CAESAR?

No, that value was defined in the benchmark job. It was given, just like the diameter and thickness were given.