How can I remove numerical damping completely with the generalized alpha method?
Hi,
Is there a way to circumvent the limit of TC1 > -0.333 in the TSTEP control card?
I’m currently running a non linear transient analysis where I wish to see the effects of material damping on my model, Consequently, any numerical damping is not desired. I am using a multiscale material model from multiscale designer, hence I can’t use any explicit time integration methods and am therefore limited to the generalized alpha method.
From the attached paper, it suggests that the parameter rho_infinity is able to control how much numerical damping is present in the generalized alpha method.
I wish to therefore use a rho_infinity setting of 1 as no numerical damping will be present throughout the whole frequency spectrum.
rho_infinity relates to the TC1 setting in optistruct the following way:
According to optistruct's documentation, TC1 corresponds to -1*alpha_f in the attached paper, which relates to rho_infinity through the following relationship:
This suggests that a rho_infinity of 1 needs a TC1 setting of -0.5 which currently is not allowed by optistruct.
Is there currently a method to circumvent this limitation?
Thanks in advance for your help.