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Rigid connectors VS Fixed constraint

Posted Dec 21, 2020, 8:15 a.m. EST Structural & Acoustics, Modeling Tools & Definitions, Structural Mechanics 2 Replies

Likitha Thimmaraju Girijadevi
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Im simiulating a test set up for random vibration analysis, I fix my test object onto the fixture using M5 screws and use bolts to lock my fixture onto the test bed.

Would rigid connectors be a best option between the fixture and test bed or fixed constraint be suitable?

Thank you

2 Replies Last Post Jan 3, 2021, 7:33 p.m. EST
Henrik Sönnerlind COMSOL Employee

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Posted: 4 years ago Dec 22, 2020, 11:10 a.m. EST

Hi, Likitha,

I know that you already have the answer, but for other readers:

Typically, you apply the excitation as a volume load, with the attachments to the fixture being fixed. The only reason to use a more complex modelling approach with rigid connectors is that you want to evaluate the reaction forces acting on the fixture bolts.

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Henrik Sönnerlind
COMSOL
Hi, Likitha, I know that you already have the answer, but for other readers: Typically, you apply the excitation as a volume load, with the attachments to the fixture being fixed. The only reason to use a more complex modelling approach with rigid connectors is that you want to evaluate the reaction forces acting on the fixture bolts.
Likitha Thimmaraju Girijadevi
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Posted: 4 years ago Jan 3, 2021, 7:33 p.m. EST

Thank you so much Hendrik :)

Thank you so much Hendrik :)

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