I understand that you want to modify the stiffness and damping coefficient for the revolute joint you have modelled.
You can expand the “Internal Mechanics” section of the Block Parameters dialog box and specify the “Damping Coefficient” and “Spring Stiffness.”
Refer the documentation for more information:
As for the optimal values of these parameters, that solely depends on the application and the nature of system being modelled.
Best,
Umang
