RIFLEX Damping Input 1. Rayleigh damping: \(C=\alpha_1 M + \alpha_2 K\) 2. Input description from the Riflex user manual 3. SIMA - global system damping input 4. Damping on cross sections Damping can also be set on cross sections The damping on cross section will replace the global damping in dynmod 5. Recommendations It is recommended to use only stiffness proportional damping, \(\alpha_2\) Mass proportional damping, \(\alpha_1\) , may introduce damping of the rigid body motion If you have compression in the system, Total Stiffness Damping may give negative damping in the system. In these cases, it is suggested to use choose Material Stiffness Damping