rayleigh

[imancivil]

Hi All,
I am using rayleing damping for my model, so it has alpha and beta. But there there are other 2 parameters in rayleigh command ($betaKinit $betaKcomm) what are "stiffness matrix at initial state determination" and "stiffness matrix at last-committed state determination".
Is there any reference to explain them?

Thanks

[silvia]

for the stiffness-proportional damping, which stiffness do you want it to use?
if you don't know, just go with the initial one.