I'm running a random-vibration analysis of a power supply with the following:

Nodes = 37 K, Elements = 17 K, and DOF = 158 K.

The model meshes correctly, but it takes days to solve. I'm running on a Quad Core with 3 MB of RAM. Any ideas on how to reduce the solution time? I've been told that I can't use contact sets when running random vibration. Could anyone confirm this, and if so, are there work arounds. The model is a mixture of solids and sheet metal parts. I've completely simplied the model so there are no small features.

Thanks,

Dave

1211 frequency points is a tremendous amount. What is the frequency range for your PSD curve? How many natural frequencies are you trying to find? My PSD curve goes from 5-500 Hz, so instead of having my solver return a certain number of natural frequencies, I just have it return all up to 500 Hz. With my particular models, I usually only see 2-6 frequencies in this range. It sounds to me that if you are only specifying 10 frequency steps under the study properties, then you probably are solving for too many natural frequencies.