How can i put masses on modal frequences response ?

Marco Calistri

Hello;

I'm studing Mechanical Engeneering al University of Florence in Italy and i have an exam about Hyperworks with Optistruct. I have a problem with modal frequences response i don't know how to put in the analysis concentrated masses. I create the mass and the loadcols with GRAV card but i don't know where shoud i put the collectors. 

Thanks in advice

Marco Calistri

Adriano A. Koga

you're looking for preloaded analysis?

you can add your GRAV as a linear static loadcase, and use it as preload for the FRF.

There is an example if you search for 'Preload' in OS documentation.