The static forces are computed by the splines from the property file; this is the first term, C1(x)*x, of F_lin. But the second term, C1(x0)*gamma*(xdot-zdot), is computed with a constant value C1, obtained at the zero position of the spline.

The coefficients alfa, beta, gamma are linear scaled to obtain the loss angle at 15 Hz. The dynamic stiffness can not be controlled. The stiffening factor is coupled with the loss angle. For example: