Why are PSD reaction forces way too high when significant mode is very high in ANSYS 10.0?
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Your psd input has a very steep final slope and your model has a significant mode much higher than the psd curve. These two things combined to produce the serious numerical error you are seeing in the curve fit. An improvement in the closed form curve fitting algorithm will prevent this error in 11.0 (Ref: Defect 51073.) For a PSD analysis with frequencies much higher than the spectrum the undocumented spopt,psd,,yes,,,,,NUME gives a much more accurate solution. This performs a numerical integration as was done pre-5.0. |
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