It has been requested to perform a modal analysis with modal damping. When I have performed normal modes analysis (Sol 103) in Nastran, it seems that damping is neglected. Is there a way that modal damping can be included in the modal analysis?
It has been requested to perform a modal analysis with modal damping. When I have performed normal modes analysis (Sol 103) in Nastran, it seems that damping is neglected. Is there a way that modal damping can be included in the modal analysis?
Is it possible you are being asked to perform a modal analysis with loading, such as a transient response or frequency response analysis? If so, then the modal damping becomes involved.
But for Real Eigensolutions, modal damping is always ignored. If you do need to include damping in the eigensolution, then you need to do a Complex Eigensolution. See the Dynamic Analysis User Guide for detailed information (Chapter 14):
The exercise is part of a FEM verification. No loading is specified, either transient or frequency response. The requirement is to provide damping definition (up to 150 Hz) and modal damping is required in the modal analysis. I'm using MSC-Nastran 2017.
