In the field I am in (structural) mode superposition is commonly used to perform dynamic analyzes. Is this a default analysis method also for other fields, e.g. automotive, mechanical,...?
Of course, direct integration is more accurate but is the accuracy of a modal superposition generally...
Only modes with a MPF larger than a set ratio is used in the analysis.
I was under the impression that modes with a low MPF has little or no influence of the acctual behavior of the structure. So by eliminating these modes the simulation/analysis is reduced w/o losing any accuracy.
Andreas
I am in the process of designing a railway bridge using modal analysis in LUSAS.
Throughout my short career I have been told to use the Modal Participation Factor as a measure to obtain desired accuracy. It has worked fine until now when even MPF=99.5% gives substantial errors of up to a factor...
