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Transient modale superposition analysis

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Old   October 15, 2016, 11:18
Default Transient modale superposition analysis
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hello there, i need to know how to proceed with a transient analysis based on modal superposition with the optimale modal base, i tried to select all the modal base witch contains 60 modes and it worked, eventhough when i wanted to select the optimale modal base depending on modes effectives masses 90% of total system mass it does not work, i tried with 'modseloption' and 'Mxpand' commands but i can't figure it out, PLEASE HELP
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effective mass, modal analysis, modal basis, transient analisys

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