Hi there!

I have a few years background in piping analysis and work with pipe stress analysis software. However, I am quite new to CII, which my current employer is using (version 4.50).

Recently I began investigating the dynamic capabilities of this software and found that one has to manually subdivide elements for eigenfrequencies to resolve correctly.

I know other software which perform this automatically "behind the scenes" given a maximum element length. This can be pretty useful e.g. when using an existing model originally designed for static ananlysis as basis for the dynamic analysis.

Is my finding correct? Maybe "automatic subdivision" has been implemented in more recent versions of Caesar II?

In our humble opinion "automatic subdivision" is a hit or miss affair at best. You can find papers written on this subject, but they only discuss seismic events, or water filled lines, or low carbon steel. The constants in these equations need to change based on your specific analysis.

In Version 5.00 we added an option to use a "consistent mass matrix", instead of the usual "lumped mass formulation" typically applied to piping. This obviates the need for "auto subdivision".