Why is my rotordynamic model not giving a linear response in a harmonic analysis? The only load is an acceleration load. I expect the solution to vary proportionately to this acceleration value, but it doesn't.


The reason for the non-proportional response is that in addition to the acceleration load you have a centrifugal load produced by CMOMEGA and that is constant.

It is probably not desirable to include the centrifugal forces in a harmonic ` they are oscillating between centrifugal and centripetal ` so I would recommend turning them off with the undocumented command FCENT,OFF. I tried this and it produces a proportional response for an increase of 1000 in the acceleration.





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