modal transient analysis
Hi,
I am working on shock response transient analysis using modal superposition method.
As this requires a pre-requisite of solving normal modes analysis . I wanted to know how many modes to be captured for transient run.
Does this depend on effective mass ratio or on participation factor?
Or are there any thumb rules or guidelines for the same
My shock response analysis is for 30 ms
Thank you
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Hi,
How can we predict the accuracy of modal based transient solution like convergence is seen in direct transient analysis
Thank you
Hi gopal_rathore
According to the e-book 'Dynamic Analysis with OptiStruct' there are no such thumb rules. The natural frequencies and normal modes of a structure can be a function of the load and the damping present on the system. A system with N DOFs will have N natural frequencies.
Have a look at the e-book (page 77) modal transient analysis is described in detail with a tutorial.
https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/