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check sum forces diference with solver inertia relief

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Hi,

 

I have a model with a inertia and angular acceleration. When I perfom check sum forces  I get Moment value . Ok. but this value should ne Inertia*angular acceleration. If I launch the model to nastan nx with inertia relief I get exactly angular acceleration =Moment/Inertia. It seems to be thta the Inertia is not the inertia that comes from mass porperties

 

That is the error is about 4%. Do youn know why?