Dear Sergio,

Thank you very much for your reply.

Your suggestion of constraining the motion of the springs in the vertical direction using prismatic joints worked out of the box, without having to adjust anything else other than connecting them and defining the direction of motion. Furthermore, in my original model, it also fixed some warnings about the initial conditions. Also, the mathematical expressions of the transfer functions that were correct, were greatly simplified.

Just for the record, the model that I shared was already some sort of minimal example. The original model is part of a package, with classes that favor the usage of many of instances of the same kind, with many inputs and outputs. Somehow, I was not getting an obvious miscalculation when the number of springs was small. The problem began after increasing the number of components. Somehow, the complexity made the problem evident.

Thank you very much again.

Cheers,

Fabián