7 docs tagged with "damping"

The relaxation solution is iterative, and these parameters control the iterative process. They can be adjusted if convergence problems are experienced, or to speed up analysis.

This dialog can be accessed from the Model > Dynamics > Create CEAP modal damping file menu command. This command creates a modal damping file for use in Oasys CEAP (Civil Engineering Application Package).

Modal analysis is carried out ignoring damping, however much of the dynamic post-processing relies on damping to get a solution.

Explicit time history analysis - mass and damping definition

The frequency damping table defines the critical damping ratio as a function of frequency. It is used by harmonic analysis, time history analysis and footfall induced vibration analysis when the damping ratios for modes vary with frequency. Values are interpolated from the table. Frequencies outside the range use the nearest specified value.

The damping table defines the critical damping ratio for the given modes of modal dynamic analysis. It is used by harmonic analysis, time history analysis and footfall induced vibration analysis when the damping ratios for some modes need to be defined individually.

There are times when it may be difficult to achieve convergence, particularly where the soil stiffness varies significantly over the site. Adjusting the damping and stiffness parameters may help achieve convergence.