Assigned Mass in a Simulation

Hello

I have an assembly whose stresses and strains I have to calculate when subjected to accelerations in different axes.

To do this, I simplified the parts that make it up and I assigned masses to them to take into account the components removed during the simplification.

Fortunately for me to have checked the results of my simulation, because obviously Solidworks Simulation does not take into account the weights assigned during the calculations!!

Do we have to play with the density of matter so that their mass corresponds to their real mass? Do we have to create a material for each piece?

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When you assign a mass, the moments of inertia are also wrong, which makes the calculation impossible it seems to me.

It is possible to replace this moment of inertia and maybe the calculation then becomes feasible, others may confirm it.

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Why not replace them with remote masses in the simulation?