My ANSYS Workbench Simulation 9.0 MSUP (mode superposition) harmonic response
results do not match my full harmonic results in the same software product. Why?
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One possibility is that not enough modes are being considered in the MSUP harmonic analysis. This can occur when the frequency range is set to small. By default, Simulation uses the following range of frequencies in conducting the MSUP harmonic response: min = factor/min freq and max = factor*max freq where factor = the DS system variable (dssysvar) "MSUP expand factor", which defaults to just 2.0. Setting "MSUP expand factor" to a larger value will include more modes in your harmonic response analysis and will most likely give better results. Development is considering exposing this "MSUP expand factor" in the Details Pane in Simulation 10.0. Other harmonic response analysis discrepancies may be due to different damping or not not using the same amount of solutions (i.e., you may need to set clustering on for MSUP). Also, a coarse mesh will often yield differences, so be sure to refine your mesh as needed. . |
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