MASS21 - use with or without the rotary inertia?

Vitkacy1989 · Apr 5, 2019

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?

Shu Jiang PEng SE · Apr 8, 2019

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

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Structural design, analysis, inspection, drawing review and stamping, and connection design

scheah · Apr 22, 2019

Vitkacy1989 said:
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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MASS21 - use with or without the rotary inertia?

Vitkacy1989

Structural

Shu Jiang PEng SE

Structural

scheah

Structural

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