Steps in a Dynamic Analysis
You generally perform dynamic time, frequency, and random analyses in four steps:
1. Set up the constrained or unconstrained modal analysis.
2. Set up the first dynamic study. The purpose of this is to sweep over the time or frequency domain and report measures. You must specify these measures prior to running the analysis. You must also specify the modal range, and specify non-zero damping.
3. Graph the results from the measures and note where the peaks occur. These are the intervals where full results should be specified.
4. Set up the second dynamic study. This time, specify the intervals for full results based on the plots from the first run. Full results will enable you to create fringes and animations.