Hi SimScalers!

Many SimScale users are wondering how to calculate Rayleigh coefficients (\alpha & \beta) for material damping. The answer is quite simple, please have a look at the procedure on page 4 of this publication: **Approach for Selection of Rayleigh Damping Parameters Used for Time History Analysis**

You have to only start with having three values in mind:

- Modal damping value (\zeta). The larger the value the greater will be the damping effect. For example, \zeta = 0.1
- Lower (ω
_{0}) and upper (ω_{1}) natural frequency values of the structure. These values can be attained via free vibration frequency analysis, i.e. the lower and upper natural frequency range of interest. For example, ω_{0}= 100 Hz and ω_{1}= 500 Hz

Hope this helps.

Best,

Ahmed