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When you perform rigid body analysis, geometry is not important unless there is a contact between bodies.
Important elements of the rigid body are the mass center, mass, and moment of inertia.
Therefore, unless there is a contact between bodies or the bodies move interdependently, you don't need to include multiple bodies with complex geometry.
Rather than connecting unnecessary bodies with a fixed joint one by one, you may want to replace each body with a lumped mass to perform analysis.
(This helps a lot in terms of graphic performance in a model with a complex geometry.)
For example, in the following model, if the lower parts of the excavator are fixed to each other, you can obtain the same result by replacing the lower bodies with a simple body and setting the mass center, mass, and moment of inertia the same as in the original model.
(This example does not show significant improvement in terms of graphic performance as it is a simple model. But, in the case of a complex model, you may see significant improvement in the graphic performance.)
Please keep in mind that, for modeling and analysis of rigid bodies, it is more efficient to replace the bodies with a lumped mass rather than modeling each body in detail.
You can go to [Home]-[Measure]-[Mass] and select multiple bodies to determine the mass center, mass, and moment of inertia for the whole bodies conveniently.
You can manually enter these values as the properties of the lumped mass in the User Input window.
