I have just a general question how people approach the problem of spurious oscillations generated in dynamic analysis when using nonlinear soil constitutive models.
I understand sometimes numerical damping can be introduced into the original Newmark integration scheme. However, it seems that this is not always effective.
I also see that sometimes scientific papers simply do not show accelerations, and focus more on the primary unknowns, i.e. displacements.
The other option would be to introduce Rayleigh damping. Has anyone done it? How easy it is to be done for the models in umat format?
Thank you in advance for the tips and possibly discussion.