*************** Link properties *************** .. toctree:: :maxdepth: 1 lp_general_stiffness lp_general_viscous_damping lp_elastic_joint lp_linear_guide lp_bearing lp_screw lp_gear lp_belt lp_rack_and_pinion lp_worm_gear lp_kinetic_friction lp_htc lp_tcc =============== Damping methods =============== The following damping methods can be applied to links in MORe using the corresponding link properties. =============== Viscous damping =============== The damping force is proportional to the velocity of the link. Usually referred to as the viscous damping coefficient. .. image:: media/viscous_damping.png :alt: Bearing link definition :scale: 30 % ================== Hysteretic damping ================== The damping force is proportional to the displacement of the link. Often referred to in literature as the loss factor. Mathematically, hysteretic damping can only be defined in the frequency domain. Thus, direct use of hysteretic damping is only possible for FRF & Modal analyses (by deselecting the default equivalent viscous damping option). For transient analysis, the equivalent viscous damping option cannot be removed, it always incorporates hysteretic damping indirectly. .. image:: media/hysteretic_damping.png :alt: Bearing link definition :scale: 30 % ========================== Equivalent viscous damping ========================== In the time-domain, a static displacement with hysteretic damping would result in an imaginary damping force acting on the system. To overcome this issue, the hysteretic damping parameters are converted into viscous damping parameters under the assumption that at the eigenfrequencies, the hysteretic and viscous damping force amplitudes are the same. .. image:: media/equivalent_viscous_damping.png :alt: Bearing link definition :scale: 30 % ============ Context Menu ============ ----------------- Add link property ----------------- Add the selected link and define its properties. ---------------- Duplicate/Delete ---------------- Duplicate/Delete the selected link property.