{"id":310915,"date":"2023-10-10T17:35:49","date_gmt":"2023-10-10T17:35:49","guid":{"rendered":"\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/"},"modified":"2023-10-11T00:55:29","modified_gmt":"2023-10-11T00:55:29","slug":"pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/","title":{"rendered":"Pre-stressed modal why changing end time causes natural frequency to change?"},"content":{"rendered":"

Hi all,<\/p>\n

I’ve been using pre-stressed modulue to modal analysis. Under “Static structural” -> “Analysis setting” -> “step controls”, I changed the “step end time” from 10 sec to 100 sec and the results of natural frequency changed dramaticlly. <\/p>\n

Does anyone know why is that and what kind of phenomenon behind it? Which simulation results should I trust?<\/p>\n

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