April 12, 2023 at 11:11 pmMaryam TabbakhhSubscriber
I have three parts that I wanted to define different Rayliegh damping for each part. I calculate The coefficeint by a formulation where I need two tiers for Period (T1 and T2):
set xDamp1 0.15; # damping ratio calculated using q factor in SW4: ξ=1/2qs
set T1 1.0;
set T2 0.1;
set pi 3.141593;
set w1 [expr 2*$pi/$T1];
set w2 [expr 2*$pi/$T2];
alfa [expr 1*$xDamp1*(2*$w1*$w2)/($w1+$w2)];
beta [expr 1*2.0*$xDamp1/($w1+$w2)];
Should I just calculate the alpha and beta for each part and assign it and LSDYNA will calculate Rayleigh damping by itself?
April 13, 2023 at 12:41 pmAshish KhemkaAnsys Employee
Please refer to the following link:
Damping — Welcome to the LS-DYNA support site
April 13, 2023 at 3:33 pmMaryam TabbakhhSubscriber
thank you very much for your response. But it is not clear for me that is there any specific option for Rayleigh damping or we should define mass damping and stiffness damping separately to get the Rayleigh Damping?
April 13, 2023 at 6:22 pmArmin_ASubscriber
Could you let us know which keyword card you use to define damping in LS-DYNA?
April 13, 2023 at 6:57 pmMaryam TabbakhhSubscriber
April 13, 2023 at 7:11 pmArmin_ASubscriber
April 13, 2023 at 7:34 pmMaryam TabbakhhSubscriber
Thank you very much!
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