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 Sanjay Patel over 5 years ago

Unfortunately, The theory and equation behind NODYNRSP are not exposed in the documentation. QRG tries to explain, perhaps not effectively. That is why, the best approach is to always include enough normal modes and manually try to filter high frequency excitation from the loading as the modes are at the high frequency are not properly represented by the mesh density. The reason why NODYNRSP is included in RESVEC command would be because it only applies to residual vectors. Thanks. Sorry, if you were expecting more.
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0 Sanjay Patel over 5 years ago

Unfortunately, The theory and equation behind NODYNRSP are not exposed in the documentation. QRG tries to explain, perhaps not effectively. That is why, the best approach is to always include enough normal modes and manually try to filter high frequency excitation from the loading as the modes are at the high frequency are not properly represented by the mesh density. The reason why NODYNRSP is included in RESVEC command would be because it only applies to residual vectors. Thanks. Sorry, if you were expecting more.
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