Linear springs in Ashes are applied on nodes and modeled as a support (see Keywords ) with a stiffness (in N/m for translational springs and N/rad for rotational springs). When a spring is applied onto a node, the node will experience a load

$$L_i=K\cdot d_i$$

where

$$L_i$$
is the load (either a force or a moment ) in the direction corresponding to the degree of freedom
$$i$$
$$K$$
is the spring stiffness
$$d_i$$
is the displacement of the node corresponding to the degree of freedom
$$i$$