Does inertia relief (-2) has a single solution for a given mass distribution and reaction forces?

Viktor Antevski
Viktor Antevski Altair Community Member
edited January 9 in Community Q&A

Greetings fellow forumers, 

I want to discuss about the inertia relief solving process in static analysis (behind the scenes) so we can be more comfortable in this type of analysis. So I will compare it with classic approach with SPCs where masses are known and the model is subjected to gravity load. To be statically in balance, the spc forces (reactions) should be equal to the sum of the products m*g of all elements. So the unknown are the SPC forces.
When performing inertia relief analysis, the reactions are known and the masses are known, I assume the solver is calculating the acceleration for each single mass in the model. 

I have two questions for discussion:

First, is there a unique solution to this problem, meaning that only a single set of accelerations for each mass will solve the equation?

Second, will the solver calculate a 1g force in each element if the accurate mass and reactions are input for a realistic model subjected to 1g? If not, it is not very intuitive that each single mass particle has a slightly different acceleration than 1g in a 1g field or more likely the reaction forces are not correct.

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Thank you in advance,
Viktor

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