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MASS21 - use with or without the rotary inertia?

thread569-451353

MASS21 - use with or without the rotary inertia?

MASS21 - use with or without the rotary inertia?

(OP)
Hi Folks,

I have a question on MASS21 keyoption (3).
We can decide whether or not our mass element should include rotary inertia.

So far I always thought that rotaty inertia is always a-must since it lets knows the Solver how unmodelled part behaves under certain acceleration.

My question is, could you shortly explain when mass without rotary inertia is useful?

RE: MASS21 - use with or without the rotary inertia?

You do not need to consider rotary inertia whenever the support is coincident with the (equipment (mass) rotation center.

—————————————————————
J&J Structural Consulting Inc.
Structural design, analysis, inspection, drawing review and stamping, and connection design

RE: MASS21 - use with or without the rotary inertia?

Quote (Vitkacy1989)

could you shortly explain when mass without rotary inertia is useful?
Static analysis does not require rotary inertia to be useful.

Kind regards,
Jason

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