Setting up the damping in a MORe model includes the component and link damping. For both we have a best practice for standard applications like machine tools.
You can follow these steps to set up reasonable damping in your model:
- Export with undamped modal analysis from ANSYS.
- Use of ‘Segmented modal damping’ in the components with values of 2 – 3%.
- For link properties with rolling elements such as linear guides, ball screw drives, and bearings, apply viscous damping for every degree of freedom with a value of ‘stiffness’/100’000.
- For link properties of links with rubber parts (e.g. supports), apply hysteretic damping with loss factors of 0.1 – 0.2.
- Compare with experimental frequency response analysis results if possible. Tune the damping values to match the sharpness of the resonances.
- With the comparison and tuning of step 5, you have new standard damping values for similar machine designs that you can use in future simulations.