How does NODYNRSP do its thing?

Does anyone know how the NODYNRSP option of the RESVEC command do what it does?

I haven't been able to find any documentation on this detail.

My (wild) guess is a low pass frequency dependent damping is applied to the modes associated with residual vectors to allow them to be suppressed at high frequency but allowed to responded at low frequencies...

Second question on this topic (which is likely related to the first) is why the NODYNRSP option embedded into the RESVEC call. It seems like it could/should be a separate option on top of the RESVEC command.

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0 Don.Graff over 5 years ago

we took this conversation over to tech support... this specific question was about why the residual vectors were the same with and without the NODYNRSP flag... that is because NODYNRSP is enacted after the residual vectors are calculated, but before they are used in any subsequent analysis... it only impacts the modal mass associated with the residual vectors. I wanted to post this in case anyone was following this discussion.
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0 Don.Graff over 5 years ago

we took this conversation over to tech support... this specific question was about why the residual vectors were the same with and without the NODYNRSP flag... that is because NODYNRSP is enacted after the residual vectors are calculated, but before they are used in any subsequent analysis... it only impacts the modal mass associated with the residual vectors. I wanted to post this in case anyone was following this discussion.
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