Basically, Abaqus ignored UAMP in Modal Dynamic step analysis. But I am looking for a way to extract the dynamic response of a beam (a node in the beam) to the base excitation. The issue is the excitation amplitude because the excitation amplitude could not fit in any of the predefined amplitude (periodic, tabular, ...) and I need to define it in the UAMP subroutine. But Abaqus ignores this UAMP amplitude in Dynamic Modal analysis.

Does anyone know that if there is any way to do this in Abaqus or it is not possible at all?