How to introduce the mass in ansys
How to introduce the mass in ansys
(OP)
Hi everybody;
Does any one could tell me ho to specify the mass in the modal analysis of a structure by ANsys software. I specified it through Inertia; Gravity commands but i got a very large value of frequency. I think the mass was zero.
Thanks.
Does any one could tell me ho to specify the mass in the modal analysis of a structure by ANsys software. I specified it through Inertia; Gravity commands but i got a very large value of frequency. I think the mass was zero.
Thanks.





RE: How to introduce the mass in ansys
If you are working in millimiters you must specify the density in ton/mm^3.
If you are working in meters you must specify the density in kg/m^3.
I had also this problem in the past. Prepare a simple model of a beam and compare it with the analytical results and you will see that they match.
Note that the frequency independs on the gravity so you shouldn´t specify it.
RE: How to introduce the mass in ansys
RE: How to introduce the mass in ansys
This is not necessarily true; the loading condition could be such that the initial stress state caused by gravity affects the stiffness of the structure. If this is the case, then a pre-stressed modal analysis is needed.