Reduced beam model for an assembly

NaikD · Aug 3, 2019

Hi All,

I need help with general guide lines to create a beam model for a complex assembly that would match at least first few frequencies.

For known cross sections (angle, channel etc.,) I can build the model. However, for complex assemblies with many subassemblies, I am assuming the process could be of a trial and error by assuming simplified cross sections and adjusting density to match first couple of frequencies (say 5).

Any help is appreciated.

Thanks,
- Dipak

FEA way · Aug 3, 2019

You are not limited to these common cross-sections only. You can draw a complex user defined section and the software will calculate its properties. Or select user integrated section and enter the geometry data obtained somewhere else.

If your model is too complicated for beams but has thin-walled members then consider using shell elements. Modal analysis should solve relatively fast even for large models.

NaikD · Aug 4, 2019

Thank you FEA way!

I never had to build a reduced beam model to represent a complex assembly so wanted to learn from the experts here.

Yes my model is too complicated with steel and aluminum alloy parts. I can build a model with shell elements. However, customer wanted a reduced beam element model so shell model is not an option.

I can approximate a complex user defined section to represent the assembly. I thought to match first few frequencies I will have to play with density/modulus of elasticity.

Thanks again. I appreciate your help!

- Dipak

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Reduced beam model for an assembly

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