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Free body modal analysis

Solution Partner Creator Solution Partner Creator
Solution Partner Creator

Hello Femap experts,


Could you help me with an issue about modal analysis? 


I'd like to know if it is possible to execute a modal analysis and if it is necessary to use freebody data/tools.


Attached you will find a body that we wish to analyze in order to find its natural frequencies, this body will be only hanging from the top surface.


Because modal analysis is asking for a movement constraint, the question is: can we do the analysis without a movement constraint, even if it is a nonlinear (maybe) analysis?


Any help will be very useful... thank you.


Re: Free body modal analysis


Natural frequency analysis can be done with or without constraints.  If analysing without constraints, then the first 6 modes are 0 Hz rigid body modes (ie. "floating" modes where there is no strain / elastic energy in the structure itself).  The 7th mode is the first structural mode, asssuming there are no other "mechanism behaviours" within the modelled structure.