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how to perform modal analysis of cylinder subjected to external pressure
Hi,
Please refer to OptiStruct user guide for tutorials on modal analysis.
I want to perform a modal analysis of an inflatable tube. The analysis is split in two steps- inflation step and subsequent modal step.
The pretension is carried over into modal through STATSUB (PRELOAD) from inflation step. Inertia relief is applied through PARAM>inrel -2
However the results are not matching the experiments sufficiently. Can the internal overpressure be directly included in modal analysis instead of indirectly through preloading?
Hi Ivan,
I think this is the reason:
From Help:
Preloading applied to a Normal Modes Subcase is not transferred to modal solution sequences (with the same modal space and boundary conditions) in the same input deck.
Thanks Prakash, I will try a different modeling approach for a better correlation.
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