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

Hi- if my memory is correct, NODYNRSP zeros out the modal mass of the residual vector modes... that way they can still participate in the 'static' portion of the response, but not the 'dynamic'. Maybe someone else can confirm this.

As far as how this gets triggered, it was put into the RESVEC command as an option, allowing it to be turned on or off along with any other RESVEC options. To me, it is nice to have it contained within the RESCEV command to keep all options together.
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0 Don.Graff over 5 years ago

Hi- if my memory is correct, NODYNRSP zeros out the modal mass of the residual vector modes... that way they can still participate in the 'static' portion of the response, but not the 'dynamic'. Maybe someone else can confirm this.

As far as how this gets triggered, it was put into the RESVEC command as an option, allowing it to be turned on or off along with any other RESVEC options. To me, it is nice to have it contained within the RESCEV command to keep all options together.
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