Spring Simulation

The figure shows a sketch of the mechanism, where K(in) and K(out) refer to the artificial stiffness added to the input and output ports, respectively. The displacement of the output port (objective function) is represented by U(out) when a force is applied to the input port. The sketch shows the full range of the mechanism. Since the problem is symmetric, only the Gray area is meshed for computational efficiency. The small black squares at the top left and right of the computed region represent elements in the mesh that are not active. They are not part of the area for the global stress calculations and have physical density ρ = 1.

Now I ask myself, how can I reasonably simulate the springs on both sides of the plate? is it meaningful if I use springs elements at 1D tab with one DOF or you have some kind of recommendation for me?