1. Run an eigenvalue analysis by adding *CONTROL_IMPLICIT_EIGENVALUE and animate the resulting mode shapes by postprocessing the d3eigv output. Do the modes look reasonable? Based on the frequency of the spring-flex mode, would you say the spring is too soft or too stiff?
2. Go back to your prior input file and change the solution from static to dynamic by adding *CONTROL_IMPLICIT_DYNAMICS as suggested in the implicit guidelines. Those guidelines have been simplied/condensed into keyword format in the text document
3. If #2 doesn't give a converged solution, furthermore add some mass to the spring nodes using *ELEMENT_MASS.
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